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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.123  No.1441 (September) (2015)  >  pp.892-896

Journal of the Ceramic Society of Japan
<<Previous article Vol.123  No.1441 (September) (2015)   pp.892 - 896 Next article>>

Preparation of mullite-zirconia composites from waste foundry sand and alumina

Ruofei XIANG1), Yuanbing LI1), Shujing LI1), Yawei LI1), Shaobai SANG1)
1) The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology

Waste foundry sand (WFS) collected from lost foam casting (LFC) is adopted to prepare low cost mullite-zirconia composites with the addition of alumina by reaction sintering. The mixture samples of WFS and alumina as well as samples containing only WFS are sintered from 1200 to 1600°C. Thermal shock behaviors are evaluated by cool water quenching test with temperature differentials (ΔT) between 200–1000°C and 1–4 repeated cycles for ΔT = 1000°C. The degree of damage with thermal shock severity is measured through dynamic elastic modulus E using the impulse excitation method. The result shows that mullite-zirconia composites can be successfully manufactured at 1500 and 1600°C, but the thermal shock (TS) resistance for composites sintered at 1600°C is not satisfied. The critical temperature gradient (ΔTc) is below 200°C, and after three TS cycles with ΔT = 1000°C, the E/E0 reduced to a nearly constant.

WFS, Sintering, Mullite, ZrO2, Thermal shock resistance, Elastic modulus

Received: May 06, 2015
Accepted: June 22, 2015 , Published online: September 01, 2015



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