1. Zhongshan New Taixing Powder Metallurgy Co., Ltd., Zhongshan 528400, China; 2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China
Abstract：B4C composite ceramics were prepared by hot press sintering process with pure B4C powder and atomized Al-Mg-Sc-Zr alloy powder as raw materials mixed by ball milling method. The effects of sintering temperature and the addition of Al-Mg-Sc-Zr alloy on the microstructure, hardness, bending strength, and fracture toughness of the ceramics were investigated. The results show that Al-Mg-Sc-Zr alloy transforms into liquid phase at high temperature, and reacts with free C and B4C during sintering, which promotes sintering of ceramics and reduces porosity. With the increase of sintering temperature, the relative density of B4C composite ceramics increases, which can reach 99.6% when sintering at 2 100 ℃. The addition of Al-Mg-Sc-Zr alloy improves the mechanical properties of B4C composite ceramics, the hardness (HV), bending strength, and fracture toughness of the ceramics sintered at 2 100 ℃ increase to 3 859, (423.7±12.4) MPa, and 4.45 MPa·m1/2, respectively.
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2023, Vol. 28 
