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Effect of chemical composition of boriding agent on the optimization of surface hardness and layer thickness on AISI 8620 steel by solid and liquid boriding processes

Kul Mehmet, Yılmaz Yasin, Oskay Kürşad Oğuz, Kumruoğlu Levent Cenk

Advances in Materials Science

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2022

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Vol. 22, nr 3(73)

14--22

EN

Surfaces of cam shafts made of AISI 8620 steels were hardened by boriding processes in both solid and liquid mediums. Various chemical agents were used to achieve boride layers on the surfaces of the cam shafts in these processes. It was aimed to examine effects of the chemical agents on microhardness and thickness of the boride layers obtained. It was concluded that a bath composition of 5% B4C-90% SiC-5% KBF4 was appropriate for the hardest and thickest boride layer achieved in the solid medium, and a composition of 70% Na2B4O7-30% B4C in the liquid medium.

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Materiały powłokowe otrzymywane z kationomerów poliuretanowych modyfikowanych funkcjonalizowanym silseskwioksanem. Cz. II. Właściwości użytkowe

Król B., Król P.

Polimery

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2010

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T. 55, nr 11-12

855-862

PL

Powłoki polimerowe otrzymano z wodnych dyspersji kationomerów poliuretanowych modyfikowanych silseskwioksanem funkcjonalizowanym grupami OH (PHIPOSS). Kationomerom przypisano strukturę nanokompozytów kationomerowych i wykazano ich dużą termostabilność, rosnącą wraz ze zwiększaniem zawartości PHIPOSS. Celem badania powłok kationomerowych było wyjaśnienie wpływu PHIPOSS na oddziaływania występujące w fazie zbudowanej ze sztywnych segmentów uretanowo-mocznikowych, decydujące o morfologii wytworzonych powierzchni. Morfologię tę analizowano metodami mikroskopii i DSC. Określono też energię powierzchniową oraz właściwości użytkowe powłok. Przeprowadzono wstępne badania właściwości użytkowych, których wyniki wskazują na możliwość zastosowania opisanych dyspersji wodnych jako ekologicznych lakierów ochronnych na powierzchnie o cechach hydrofilowych.

EN

Studies on the physicochemical properties and applications of polymer coatings obtained from the dispersion of aqueous polyurethane cationomers modified with silsequioxanes functionalized with OH groups [(PHIPOSS) (Table 1)] have been presented. The obtained cationomers has been classified as possessing a nanocomposite structure and high, increasing with PHIPOSS content, thermostability (Fig. 1, Table 3). The coatings were studied with special emphasis on determining the influence of PHIPOSS on the interactions occurring in the rigid polyurethane-urea segments, on which the morphology of the obtained surfaces depend. The morphology was evaluated by microscopic analysis methods (Fig. 3,4, Table 5) and DSC (Fig. 2, Table 4). The surface energy (Table 2,6) and applicability of the coatings were also determined (Table 7). Preliminary studies indicate potential for application of the products obtained in the form of presented aqueous dispersions as environmentally friendly coatings on surfaces of hydrophilic character.

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Effect of bending on anodized Ti6Al4V alloy: I. Surface layers characteristics

Kierzkowska A., Malinowski M., Krasicka-Cydzik E.

Journal of Achievements in Materials and Manufacturing Engineering

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2006

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Vol. 18, nr 1-2

139--142

EN

Purpose: The plastic deformation behaviour of the anodized binary titanium alloy Ti6Al4V was characterized in mechanical and electrochemical tests. Design/methodology/approach: The effect of tensile and compressive stresses on properties of different clinically relevant surfaces of the deformed by bending implant rods was investigated. The deformation behaviour was characterized by FEM analysis. Relevant surfaces in tensile and compressive zones were characteristics by microhardness and roughness measurements, and electrochemical testing (Ecor, anodic polarization, EIS) in oxygen-saturated Ringer’s solution. Findings: It was concluded that bending influenced mostly the properties of material in the tensile zone of the specimen, whereas the properties of surface layer in the compressive zone and the properties of surface layer in tensile zone after rebending are comparable and not so severe. Research limitations/implications: Studies were performed in static conditions, fatique studies are planned in the future. Practical implications: Results are of great importance in for surgical practice in the in the evaluation of the influence of shaping process applied during pre-operative procedures on the performance of spinal implant systems. Originality/value: In the paper a typical pre-operative procedure of shaping was applied to anodized titanium implants in order to evaluate its influence on the characteristics of the surface layer. Studies were focused on the safety their application in vivo.