Wyniki wyszukiwania - BazTech

1

Wpływ sposobu przygotowania powierzchni próbek walcowych betonu na wyniki badań laboratoryjnych uzyskiwanych w próbie osiowego ściskania

Wojciechowski Szymon, Pozorski Zbigniew, Wójcik Paweł

Materiały Budowlane

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2025

|

nr 6

179--181

2

The experimental investigation of seepage control in different sand soils using photopolymerization

Akoguz Harun

Acta Geophysica

|

2024

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Vol. 72, no. 2

983--997

EN

Seepage control is critically essential for dams, slopes, and the stability of many engineering structures, developing over many years using different methods. This study presents a novel approach for seepage control using the photopolymerization technique to form an impermeable crust at the soil surface. Effects of exposure duration (5, 10, 15, and 30 min) and light intensities (140, 550, 710, and 1000 W/m2) on the seepage control effectiveness of four different sand soils were investigated by using the photopolymerization technique. The three-point bending, permeability and acid rain simulation tests were performed to illustrate the effect of photopolymerization on the seepage control of sand soils. Furthermore, the influence of photopolymerization on the microstructure of soils was examined with the aid of SEM analysis. The results indicated that the photopolymerization technique could improve the crust strength, acid rain durability, and permeability of sand soils. The crusts at the surface layer of soils were formed after the photopolymer was applied to the sand surface and then exposed to UV light. These crusts of different soils have bending strengths and thicknesses in the range of 34.57 and 68.07 MPa, 2.13 and 6.18 mm, respectively. The increase in exposure duration and light intensity, resulted in the gradual increment of soil crust thickness. On the other hand, the increase in light intensities have more effective on the crust thickness. The formed soil crust has been provided an impermeable surface that prevents the weight loose from the surface of the soil under acid rain conditions. The SEM analysis indicated that the photopolymerized gels were homogeneously distributed between the grains in all samples, although the grain distribution of soils were different. Since the photopolymerization method has a short treatment duration and is easier to apply on the sand surface, the occurrence of the crust at the soil surface by this technique may open a new and improvable path for seepage control. The obtained results showed that the photopolymerization method is promising for repairing, restoring, and strengthening the construction materials in different engineering areas, as well as seepage control.

3

Influence of aluminum alloys surface treatment on the durability of glued joints

Kowalik Joanna, Tworek Magdalena, Smaruj Michał

Polimery

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2023

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Vol. 68, nr 10

523--529

EN

The aim of the work was to analyze the method of preparing the aluminum surface in terms of the functional properties of glued joints with the use of one-component polyurethane adhesive. Six methods of surface treatment of EN AW-5251 aluminum alloy were tested. In addition, changes in the shear strength of adhesive joints after environmental exposure were determined. The best surface preparation processes were atmospheric plasma and anodizing.

PL

Celem pracy była analiza sposobu przygotowania powierzchni aluminium pod kątem właściwości użytkowych połączeń klejonych z zastosowaniem jednoskładnikowego kleju poliuretanowego. Zbadano sześć metod obróbki powierzchni stopu aluminium EN AW-5251. Ponadto określono zmiany wytrzymałości połączeń klejonych na ścinanie po ekspozycji środowiskowej. Najlepszym sposobem przygotowania powierzchni była plazma atmosferyczna i anodowanie.

4

Elektrochemiczno-mechaniczne polerowanie złożonych i chropowatych części

Jemielniak Krzysztof

Mechanik

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2023

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R. 96, nr 1

30

PL

Opracowano nowy proces polerowania części metalowych polegający na jednoczesnym sprzężeniu wykańczania metodą przeciągania w luźnym ścierniwie (drag finishing) i polerowania elektrochemicznego. Jest on oparty na synergicznym działaniu mechanizmów ściernych i chemicznych, co umożliwia poprawę chropowatości powierzchni w ciągu kilku minut, z zachowaniem kształtu krawędzi.

5

Electron beam surface hardening of steel C45

Śliwiński Piotr, Kubik Kamil, Kopyściański Mateusz

Biuletyn Instytutu Spawalnictwa w Gliwicach

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2022

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Vol. 66, No. 6

27--35

EN

Surface hardening makes it possible to obtain high wear resistance of components exposed to friction without the need for hardening the entire element, thereby reducing stresses and deformations as well as process costs. The electron beam, due to its ease of dynamic deflection and focusing as well as very high heating rates, makes it possible to obtain surface layers of required properties. The article presents results of metallographic tests and Vickers hardness tests of electron beam hardened shafts made of steel grade C45. The hardening process resulted in the obtainment of layers having thickness not exceeding 400 μm and hardness not exceeding 900 HV0.1.

6

Electron beam surface hardening

Śliwiński Piotr, Węglowski Marek St., Kwieciński Krzysztof, Wieczorek Andrzej

Biuletyn Instytutu Spawalnictwa w Gliwicach

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2022

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Vol. 66, No. 1

7--20

EN

The surface hardening of steel components makes it possible to achieve high abrasive wear resistance without the necessity of hardening the entire cross-section of a given element. As a result, it is possible to apply lower stress and reduce the cost of the process. Because of very high heating rates (of up to 10^9 K/s) as well as the ease of dynamic deflection and focusing, the use of electron beam to harden component surfaces enables the obtainment of surface layers characterised by required properties. This article constitutes an overview of publications concerning electron beam-based surface hardening.

PL

Hartowanie powierzchniowe elementów stalowych umożliwia uzyskanie wysokiej odporności na zużycie w warunkach tarcia elementów, bez konieczności hartowania całego ich przekroju, wprowadzając mniej naprężeń oraz obniżając koszty procesu. Ze względu na bardzo wysokie prędkości nagrzewania, sięgające 109 K/s, a także łatwość dynamicznego odchylania i ogniskowania, zastosowanie wiązki elektronów do hartowania powierzchni elementów umożliwia uzyskanie warstw wierzchnich o wymaganych własnościach. W artykule przedstawiono przegląd prac dotyczących zagadnienia hartowania powierzchniowego wiązką elektronów.

7

Investigating the effects of alumina nanoparticles on the impact resistance of polycarbonate nano-composites

Alavi Nia Ali, Amirchakhmaghi Saeed

Archive of Mechanical Engineering

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2022

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LXIX, nr 3

431--454

EN

In this project, two types of treated and untreated alumina nanoparticles with different weight percentages (wt%) of 0.5, 1 and 3% were mixed with polycarbonate matrix; then, the impact ballistic properties of the nano-composite targets made from them were investigated. Three types of projectile noses -cylindrical, hemispherical, and conical, each with the same mass of 5.88 gr – were used in the ballistic tests. The results highlighted that ballistic limit velocities were improved by increasing the percentage of alumina nanoparticles and the treatment process; changing the projectile’s nose geometry from conical to blunt nose increases the ballistic limit velocity, and ultimately, by increasing the initial velocity of conical and hemispherical nosed projectiles, the failure mechanism of the targets changed from dishing to petalling; whereas for the cylindrical projectile, the failure mode was always plugging.

8

Reflectivity of anodised Al-Si alloy surface of belt pulleys used in combustion engines

Labisz Krzysztof

Zeszyty Naukowe. Transport / Politechnika Śląska

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2021

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z. 112

125--133

EN

The recent trend of using aluminium alloys instead of steel has reached the transportation industry, where increasingly, more parts are made of aluminium. An example is the belt pulley, applied for combustion engines for energy transmission. This part should be strong, durable, and lightweight. Aluminium-silicon alloys are a good choice, moreover, even when the surface is anodised, also because of their moderate inertia control and excellent wear characteristic during mechanical operations. Since aluminium is lightweight yet mechanically durable and anodised, it is an ideal belt pulley to use, especially in high-temperature operations. However, the main question is what type of Al-Si alloy, casting method and anodisation method should be used in terms of energy adsorption, having long-term properties for a lifetime, has to be applied. For this reason, this paper presents the influence of the chemical composition, casting method and anodising parameters on the structure and thickness of the anodic layer produced on aluminium alloys, as well as on the albedo value as an ability to reflect or absorb light. The aluminium alloys, AlSi12Cu1 and AlSi9Cu3, were used as research materials, obtained using different casting methods. The goal of this work was to determine the optimal combination of the anodisation conditions and materials for maximising the reflectivity factor of the surface, as a very important factor, determining the energy amount absorbed by an anodised surface. For further improvement of these surface properties as well as for enhancement of the properties and strengthen the material produced with different aluminium alloys production methods, different alloying additives were added. In addition, the mechanical properties of the surface layer were measured, where a remarkable hardness increase was obtained, and the best combination in form of AlSi12Cu1 high pressure cast was found with the highest albedo factor among all tested surface variants.

9

Interaction of N with White-solidified Cast Iron Model Alloys: The Effect of Mn and Cu on the Formation of Fe and Si Nitrides

Kante Stefan, Leineweber Andreas

Journal of Casting & Materials Engineering

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2021

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Vol. 5, no. 4

66--70

EN

Surface remelting and subsequent nitriding improves the surface properties of cast irons. Upon remelting, a white-solidified surface layer forms, which contains coarse Si-free eutectic cementite (θ) and Si-enriched ferrite, pearlite or martensite in the intercarbidic regions between the eutectic θ. Nitriding produces a compound layer at the surface, which is composed of ε and γ’-iron (carbo)nitrides and enhances the corrosion resistance. Nitriding of white-solidified Fe-C-Si alloys, being model materials for remelted low-alloy ferritic cast irons, has shown that Si dissolved in α-Fe notably affects the formation of ε and γ’ in intercarbidic regions while Si simultaneously precipitates as amorphous nitride, X. Under process conditions only allowing for the formation of γ’ in pure Fe, Si dissolved in α-Fe promotes the formation of ε over the formation γ’, whereas Si-free eutectic θ transforms into nitride following the sequence θ → ε → γ’. The present work studies the nitriding of white-solidified Fe-3.5wt.%C-3wt.%-M alloys with additions of M = 1 wt.% Mn, 1 wt.% Cu or 1 wt.% Mn + 1 wt.% Cu, serving as model materials for remelted pearlitic cast irons. The presence of Mn and/or Cu causes notable deviations from the nitriding behavior known from Fe-C-Si alloys. Mn accelerates the precipitation of X in intercarbidic regions and obstructs the transformation of ε formed from Si-free θ into γ’. Cu promotes the formation of γ’ in Si-rich intercarbidic regions, surpassing the ε-promoting effect of Si.

10

Hybrid surfacing: laser + MAG electric arc

Urbańczyk Michał

Biuletyn Instytutu Spawalnictwa w Gliwicach

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2020

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Vol. 64, No. 6

19--35

EN

The article discusses technological tests involving the use of the hybrid process (laser + electric arc (MAG)) for the efficient application of layers (surfacing). The objective of the tests was to determine the effect of an additional welding power source (laser beam) on the possibility of increasing a surfacing rate (in comparison with surfacing rates obtainable using the MAG method) as well as on the formation (shaping) of the overlay weld geometry and the degree of dilution (of the base material in the overly weld). The technological tests of the hybrid (HLAW (laser + MAG)) surfacing process involved the use of steel grade 41Cr4 and filler metal grade LNM 307.

PL

Opisano próby technologiczne wykorzystania procesu hybrydowego (laser + łuk elektryczny MAG) do nanoszenia warstw z dużą wydajnością poprzez określenie wpływu dodatkowego źródła ciepła (wiązki laserowej) na możliwość zwiększenia prędkości napawania w stosunku do metody MAG oraz na kształtowanie się geometrii napoiny i stopnia udziału materiału podstawowego w napoinie. Badania technologiczne napawania hybrydowego (laser + MAG) prowadzono na blachach ze stali 41Cr4 z wykorzystaniem spoiwa LNM 307.

11

Ocena chropowatości powierzchni polimerobetonu po obróbce narzędziem diamentowym

Całka Paweł

Stal, Metale & Nowe Technologie

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2019

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nr 9-10

14--18

PL

W artykule przedstawiono wyniki badań stanu powierzchni polimerobetonu, materiału składającego się z kruszywa kwarcowego i żywicy epoksydowej, bezpośrednio wyciągniętego z drewnianej formy oraz obrobionej narzędziem diamentowym.

12

Wpływ obróbki powierzchni przy użyciu zimnej plazmy na przyczepność powłoki galwanicznej do kompozytu grafitowego i jej przydatność w procesach lutowania miękkiego

Zimniak Z., Mirski Z., Ciepacz I., Granat K., Wojdat T.

Przegląd Spawalnictwa

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2018

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R. 90, nr 2

18--21

PL

W artykule przedstawiono problematykę dotyczącą przygotowania powierzchni kompozytu grafitowego przed nałożeniem galwanicznej powłoki miedzianej i jej wpływ na proces lutowania miękkiego w połączeniach z materiałami metalicznymi. Na próbki z kompozytu grafitowego, którego powierzchnię przygotowano różnymi metodami, oraz w końcowej obróbce przy użyciu zimnej plazmy, wytworzonej w atmosferze argonu, naniesiono galwanicznie warstwę miedzi, a następnie wykonano badania przyczepności powłoki do podłoża. Wyniki te porównano z wcześniej przeprowadzonymi pomiarami wytrzymałościowymi złączy kompozytu z naniesioną powłoką miedzianą, lutowanych na miękko z elementami ze stopu aluminium PA38 (6060).

EN

In the article issues concerning preparing the surface of graphite composite before putting the galvanic copper layer and its influence on the soldering process were described in connections with metallic materials. To samples of graphite composite, of which the area was prepared with different methods, and in final processing using cold plasma, produced in the atmosphere of argon, galvanic a layer of copper was put, and then a research on the grip of the layer was performed to base material. The results were compared with earlier conducted endurance measurements of connectors of composite with the copper layer, soldered on softly with elements of the alloy of PA38 aluminium (6060).

13

Compact microwave plasma device for surface treatment

Czylkowski D., Hrycak B., Jasiński M.

Przegląd Elektrotechniczny

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2018

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R. 94, nr 7

30--33

EN

Currently, plasma systems for plastic, metal, glass and composite surface modifications are of high interest from industry point of view. In addition, attention is paid to the reduction of investment as well as operating costs of the process. According to this, to meet industry expectations a novel compact microwave plasma device for surface treatment was designed, built and tested. The major advantage of the device is a unique shape of the generated plasma having a form of a plasma sheet suitable for surface treatment.

PL

Wychodząc naprzeciw oczekiwaniom przemysłu zainteresowanego tanim urządzeniem do modyfikacji powierzchni tworzyw sztucznych, metali, szkła i kompozytów zaprojektowano, zbudowano i przeprowadzono testy nowego kompaktowego mikrofalowego źródła plazmy do obróbki powierzchni. Główną zaletą urządzenia jest unikalny kształt generowanej plazmy tzw. płaszczyzny plazmowej dogodny w obróbce powierzchni.

14

Ocena struktury geometrycznej powierzchni stali nierdzewnej do zastosowań dekoracyjnych, po obróbce w wygładzarce pojemnikowej

Kuręda P., Musiał W.

Mechanik

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2018

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R. 91, nr 12

1097--1099

PL

Przedstawiono wyniki pomiarów struktury geometrycznej powierzchni próbek wykonanych ze stali nierdzewnej, poddanych procesowi wygładzania w wygładzarce pojemnikowej. Zaprezentowano analizy efektów obróbki oraz możliwości stosowania obróbki pojemnikowej w szeroko pojętym wzornictwie przemysłowym. Badania zrealizowano na wygładzarce rotacyjno-kaskadowej z użyciem żywicznych i ceramicznych kształtek ściernych. Przeprowadzono próbę wdrożenia robota przemysłowego do intensyfikacji procesu obróbkowego z wykorzystaniem wygładzarki rotacyjnej.

EN

The measurements results of the geometric structure surface of samples made of stainless steel subjected to a smoothing process in a smoothing container machine are presented. The analysis of the effects of treatment and the possibility of using container processing in the broadly understood industrial design were presented. The research was carried out on a rotational cascade container machine using resin and ceramic shaped stones. In the work carried out a trial to implement an industrial robot to intensify the machining process using a rotary smoother.

15

Pilniki obrotowe z węglików spiekanych - konstrukcja, rodzaje, zastosowanie, użytkowanie

Rusek B., Nowak M.

Fastener : rynek elementów złącznych

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2018

|

nr 1

50--52

PL

Złącza spajane (spawane, zgrzewane, lutowane) to rodzaj połączeń zaliczanych do jednych z najbardziej powszechnych w praktyce. Jakość tych złączy w dużej mierze zależy od przygotowania powierzchni łączonych jak również obróbki wykańczającej po operacji łączenia.

16

Transport i obróbka przedmiotów na docierarkach tarczowych

Barylski A.

Autobusy : technika, eksploatacja, systemy transportowe

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2018

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R. 19, nr 6

354--358, CD

PL

Docierania i szlifowanie należy do podstawowych metod obróbki wykończeniowej. Technologie te stosowane są obecnie zarówno w obróbce elementów metalowych, jak i niemetalowych. Przeanalizowano czas, jaki jest potrzebny do wykonania tych operacji.

EN

Lapping and grinding are classified as a basic finishing operation. This technology can be used on metallic parts, as well as on non-metallic machine elements. Times required to finalize operation are calculated and analyzed in this paper.

17

The influence of the brake pad surface machining and finishing on its friction performance : examined by inertia brake dynamometer testing

Dąbrowski T., Kurczyński D., Łagowski P., Warianek M.

Autobusy : technika, eksploatacja, systemy transportowe

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2018

|

R. 19, nr 6

399--404, CD

EN

The article describes the influence of brake pads surface machining and finishing on their friction characteristics. It shows the methods of machining and finishing of the brake pads surface and their influence on noise emission and performance. It shows the brake dynamometer test results obtained on three brake pads which have three different types of surface modification and their detailed analysis and comparison.

18

Właściwości ceramiki litowo-silikatowej po obróbce jej powierzchni

Łapińska B., Szynkowska M. I., Szczesio A., Domarecka M., Sokołowski J., Łukomska-Szymańska M.

Przemysł Chemiczny

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2017

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T. 96, nr 2

391--395

PL

Przedstawiono wyniki badania struktury powierzchni ceramiki krzemianu litu wzmocnionej tlenkiem cyrkonu oraz zmian składu chemicznego jej powierzchni po zastosowaniu obróbki strumieniowo-ściernej korundem szlachetnym o wielkości ziaren 50 μm, trawienia kwasem fluorowodorowym oraz kombinacji tych metod. Zastosowane metody znacząco wpłynęły na strukturę powierzchni ceramiki oraz wytrzymałość jej połączenia z materiałem kompozytowym. Wydłużenie czasu trawienia nie wpłynęło znacząco na rozwinięcie badanej powierzchni. Największą wytrzymałość połączenia ceramika-kompozyt uzyskano po piaskowaniu i trawieniu jej powierzchni 9-proc. kwasem fluorowodorowym przez 60 s.

EN

ZrO₂-reinforced Li silicate ceramic surface was treated by sandblasting with air-borne 50 μm Al₂O₃ particles, etching with 9% HF, and by combination of both methods. All treatments resulted in increasing bond strength to composite material. Prolonged HF etching did not change significantly surface morphol. The highest bond strength was achieved after sandblasting with Al₂O₃ and 60 s long HF etching of ceramic surface.

19

Synthesizing and characterization of nano-Graphene Oxide-reinforced Hydroxyapatite Coatings on laser treated Ti6Al4V surfaces

Bulbul E., Aksakal B.

Acta of Bioengineering and Biomechanics

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2017

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Vol. 19, no. 4

171--180

EN

Laser-treated Ti6Al4V surfaces were coated by the single-layer hydroxyapatite (HA) and double-layer hydroxyapatite reinforced by the reduced nano-graphene oxide (rGO) using the sol-gel method. The effects of rGO reinforcement at different ratios and sintering temperatures on surface morphology and adhesion strength of the single and double layer coatings (rGO/HA) were analysed. As the initial treatment process, a laser texturing was patterned on the alloy and then, prepared samples were coated. The coated laser-modified HA and HA/rGO-coated Ti6Al4V surfaces were characterized by Raman spectroscopy, X-ray diffraction (XRD), Field Emission Scanning Electron Microscope (FESEM) and the adhesion strength between the coat and substrates were determined by the standard adhesion tests. The conducted analyses indicated that the substitution of rGO into HA matrix revealed a homogeneous morphology and relatively crack-free coatings on the laser-treated Ti substrate surfaces. Adhesion tests showed that, the HA + rGO (1.0 wt. %) biocomposites exhibited a significant increase in adhesion strength compared to untreated surfaces and to the single HA-coated Ti6Al4V substrates.

20

Evaluation of alumino-silicate ceramic surface after different surface conditioning methods

Łapińska B., Sokołowski G., Rzepkowski A., Sokołowski J., Łukomska-Szymańska M.

Journal of Achievements in Materials and Manufacturing Engineering

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2016

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Vol. 75, nr 1

5--13

EN

Purpose: of this paper was to evaluate changes in alumino-silicate glass ceramic surface structure and the bond strength to composite material after different surface conditioning methods. Design/methodology/approach: Different conditioning methods of ceramic surface were applied: sandblasting, etching with hydrofluoric acid or both. Grounded ceramic surface served as control group. To evaluate changes of ceramic surface structure CLSM microscopy was used and profilometric analysis of ceramic surface was performed. Shear bond strength of composite material to ceramics was tested. Findings: The highest bond strength between tested alumino-silicate ceramics and composite material was obtained after sandblasting followed by 5 min 9% HF. Research limitations/implications: Further research should be conducted to evaluate the influence of surface treatment methods e.g. prolonged hydrofluoric etching time, on mechanical properties of ceramics. Practical implications: Extending HF etching time of glass-ceramic surface results in increased surface area and allows to obtain high bond strength to composite material. Originality/value: Results of the study applies to clinical situation as the clinical outcome and survival rate of dental all-ceramic prosthetic restorations depend on reliable bonding to tooth structures.