Table 1. Composition of Industrial Shells Used in This Study Prime coat


Slurry


Shell #1


Shell #2


Shell #3


Shell #4


Shell #5


Shell #6


Shell #7


Fused silica + zircon


Aluminosili- cate


Fused silica + zircon


Fused silica + zircon


Stucco Fused silica Zircon Slurry Fused silica Fused silica Fused silica Alumina + silica Alumina


Aluminosilicate + fused silica


heat from a massive casting will transfer through the shell, in which case, thermal conductivity is a predominant factor. Both are significant in order to have representative simula- tions for industrial use to control shrinkage defects and optimize casting quality. Because of the wide variety of shell compositions, particle


size distribution and processing parameters, the ceramic shell could have from 10 to 30% porosity, which can provide


Aluminosilicate + fused silica


Zircon + aluminosilicate (rapid shelling process)


Aluminosilicate + fused silica


Backup coat Stucco Fused silica Fused silica


Seal coat Slurry


Fused silica Fused silica


Firing temperature, ºC 850 982 850 850 850 850 850


模拟来控Ӳ收ঢ়缺陷չѩ化铸ўૅ量都很重要。 Љ数Հਫ工չ٢ӣ径ট、成ু֨ד型ङ样՟य़՟йं ਙ ％，Љю影ր透 ђ率隙孔ङד型瓷陶此֜，գ 。ਈ性热չਈ性学力ङד型ր影Ќ৲，性气 有ਫ工造铸模熔。ਈ性热ד型ր影Э३过ङਫ工热加 әЗ加热阶段，包括蜡模Ծ除 脱蜡，焙烧 烧Ӳ，预热


Fig. 2. Graphs show (a) specifici heat capacity and (b) thermal conduc- tivity values of studied shells determined by the inverse method.


March 2016 FOUNDRY-PLANET.COM | MODERN CASTING | CHINA FOUNDRY ASSOCIATION | 49


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