Wyniki wyszukiwania - BazTech

1

Interaction of Titanium with Ceramic Molds in the Conditions of Electron Beam Casting Technology

Kaliuzhnyi P., Voron M., Mykhanian O., Tymoshenko A., Neima O., Iangol O.

Archives of Foundry Engineering

|

2021

|

Vol. 21, iss. 3

27--32

EN

For the manufacture of near net shape complex titanium products, it is necessary to use investment casting process. Melting of titanium is promising to carry out by electron beam casting technology, which allows for specific processing of the melt, and accordingly control the structure and properties of castings of titanium alloys. However, the casting of titanium in ceramic molds is usually accompanied by a reaction of the melt with the mold. In this regard, the aim of the work was to study the interaction of titanium melt with ceramics of shell molds in the conditions of electron beam casting technology. Ceramic molds were made by using the following refractory materials – fused corundum Al2O3, zircon ZrSiO4 and yttria-stabilized zirconium oxide ZrO2, and ethyl silicate as a binder. Melting and casting of CP titanium was performed in an electron beam foundry. Samples were made from the obtained castings and electron microscopic metallography was performed. The presence and morphology of the altered structure, on the sample surface, were evaluated and the degree and nature of their interaction were determined. It was found that the molds with face layers of zirconium oxide (Z1) and zircon (ZS1) and backup layers of corundum showed the smallest interaction with the titanium melt. Corundum interacts with titanium to form a non-continuous reaction layer with thickness of 400-500 μm. For shell molds with face and backup layers of zircon on the surface of the castings, a reaction layer with thickness of 500-600 μm is formed. In addition, zirconium-silicon eutectic was detected in these layers.

2

Experimental and Simulation Tests on the Impact of the Conditions of Casting Solidification from AlSi9Cu3 Alloy on their Structure and Mechanical Properties

Hajkowski J., Ignaszak Z.

Archives of Foundry Engineering

|

2018

|

Vol. 18, iss. 1

167--175

EN

The impact of casting conditions on microstructure a and mechanical properties was described, especially for cast products from AlSi9Cu3 alloy. Particular attention was paid to the parameters of dendritic structure: DAS 1 and DAS 2. Selected mechanical properties (by static tension test) of test castings made using basic technologies of casting: GSC - gravity sand casting, GDC - gravity die-casting and HPDC - high-pressure die-casting, are presented for cast-on test bars and cast separately. Casts were made of the same alloy AlSi9Cu3. Fractures and the zone near the fracture (after static tension test) was subjected to VT - visual tests, PT - penetration tests and metallographic tests. The condition of porosity (fracture zone) was also assessed. The analysis of virtual results was performed using the NovaFlow & Solid system together with the database and they were compared to experimental tests. This way of validation was applied in order to assess the correlation between the local rate of cooling and the size of DAS for GSC, GDC and HPDC technologies. Finally, the correlation between the parameters of structure and mechanical properties with regard to the impact of porosity was signalized.

3

The use of LPR (logic of plausible reasoning) to obtain information on innovative casting technologies

Kluska-Nawarecka S., Śnieżyński B., Parada W., Lustofin M., Wilk-Kołodziejczyk D.

Archives of Civil and Mechanical Engineering

|

2014

|

Vol. 14, no. 1

25--31

EN

The paper presents a methodology for the application of a formalism of the logic of plausible reasoning (LPR) to create knowledge about a specific problem area. In this case, the methodology has been related to the task of obtaining information about the innovative casting technologies. In the search for documents, formulas created in terms of LPR have a much greater expressive power than the commonly used keywords. The discussion was illustrated with the results obtained using a pilot version of the original information tool.

4

Próba zwiększenia trwałości i niezawodności palników pyłowych i dysz powietrza

Kilarski J., Studnicki A., Jura S.

Zeszyty Naukowe. Elektryka / Politechnika Opolska

|

2002

|

Vol. 280, z. 51

365-368

PL

W artykule przedstawiono problem niskiej trwałości spawanych palników pyłowych i dysz powietrza oraz sposób ich rozwiązania poprzez przejście z konstrukcji spawanych na technologie odlewania.

EN

The article covers problems related to low durability of welded powered-fuel burners and air jets. It is also presented the substitution of welded constructions for pouring practice as a resolution of the above mentioned problems.