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Study on the Performance of Aluminum Oxide Ceramics Core for Nickel Based Alloy Blades

Author: FanZuoPing
Tutor: TianJing
School: Harbin Institute of Technology
Course: Materials Processing Engineering
Keywords: Alumina ceramic core Mineral additives Room temperature flexural strength High temperature deflection
CLC: TG249.5
Type: Master's thesis
Year: 2008
Downloads: 84
Quote: 1
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Abstract


With the development of aero-engine blade cooling technology , the importance of casting the ceramic core become increasingly prominent. The performance of the ceramic core has a direct impact on the production of the hollow turbine blades . The chemical stability of the alumina ceramic cores for the production of high - temperature alloy blade , good creep resistance , can ensure the complex cavity structure , the orientation of the columnar grain and single crystal hollow blades dimensional accuracy and pass rate , and can reduce the manufacturing cost of the blade . The plasticizer composition dewaxing system , sintering systems , mineral additives , and other parameters on the performance of the ceramic core research . Through the study found : the formulated core mix , mixed with polyethylene slurry uniformity , increase in viscosity , less prone to segregation, stratification , filling performance . Dewaxing and sintering holding time on the performance of the core such as dimensions shrink , the room temperature flexural strength . Appropriate to extend the dewaxing time can reduce the size of the core roasting before and after contraction ; appropriate to extend the sintering holding time can raise the room temperature flexural strength , reduce high temperature deflection . According to the experimental results the actual production , final burn temperature control at 1350 ℃ . Magnesium oxide and yttrium oxide and other mineral additives to significantly improve the core in the case of little change in the sintering temperature, the porosity is not increased , the degree of sintering . Thus mixing magnesium oxide and yttrium oxide can significantly improve the room temperature flexural strength of the core , but no obvious effect on the high temperature of deflection of the core . In a sintering temperature of 1350 ℃ , the incorporation of the zirconium oxide so that the dimensions of the core shrinkage decreases , the porosity increases , the flexural strength at room temperature decreases , and the bending strength at room temperature is reduced with the extension of the roasting time , but the softening point the temperature is increased, the high temperature of the core deflection is significantly reduced ; premise does not affect the porosity and sintered at 1450 ° C the temperature of the core , can significantly improve dimensional shrinkage , and the room temperature flexural strength . This test effectively improve the low intensity of the original ceramic core , high-temperature deformation of large performance deficiencies , some reference value to further improve the performance of the core .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Casting > Special Casting > Precision Casting
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