Progress in Investment Castings
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چکیده
منابع مشابه
Study of resin-bonded calcia investment. Part 3: Hardness of titanium castings.
The Vickers hardness of the cross-sectioned area of titanium castings made from an experimental resin-bonded calcia investment and three commercial investments was evaluated. The microstructure and element distribution of the surface zone were analyzed using an EPMA. The results showed that the high hardness of the casting surface could be decreased using the experimental investment. The hardne...
متن کاملMarginal Accuracy of Castings Fabricated with Ringless Casting Investment System and Metal Ring Casting Investment System: A Comparative Study.
BACKGROUND The thermal expansion of the investment can be restricted by the metal casting ring because the thermal expansion of the ring is less than that of the investment. The ringless casting procedure is in use in clinical dentistry, though there is little scientific data to support its use in fixed partial dentures. In this study, marginal discrepancy of castings produced with the ringless...
متن کاملDimensional accuracy and surface property of titanium casting using gypsum-bonded alumina investment.
The aim of the present study was to evaluate the dimensional accuracy and surface property of titanium casting obtained using a gypsum-bonded alumina investment. The experimental gypsum-bonded alumina investment with 20 mass% gypsum content mixed with 2 mass% potassium sulfate was used for five cp titanium castings and three Cu-Zn alloy castings. The accuracy, surface roughness (Ra), and reacti...
متن کاملAccuracy of Investment Castings
In the paper the analysis of wax pattern and casting dimensions changes during each stages of investment casting technology process has been presented. Results of wax patterns and castings of test plate free and restrained contractions dimensions changes research carried out in Department of Foundry Engineering at Brno University of Technology have been presented as well. Moreover obtained resu...
متن کاملStudy of Resin - bonded・Calcia Investment Part 3 : Hardness of Yukun MENG , Akira NAKAI , Shinichi GOTO and Hideo OGURA
analyzed using an EPMA. The results showed that the high hardness of the casting surface eould be decreased using the experimental investment. The hardness of the castings made from the experimental investment at a 25-50"m depth was lower than these frem the other investments, and the thickness of the hardened casting surface was 125/im. Layered structures with fewer layers were formed on the s...
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