首页|快速热压烧结制备高性能B4C-LaB6复合陶瓷

快速热压烧结制备高性能B4C-LaB6复合陶瓷

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为了解决碳化硼(B4C)难以烧结致密化和韧性差的问题,以B4C和氧化镧(La2O3)为原料,在 2 000℃和 30 MPa下快速热压烧结制备B4C-LaB6 复合陶瓷,研究La2O3含量对B4C-LaB6 复合陶瓷微观结构和力学性能的影响,分析LaB6的增韧机制.结果表明:w(La2O3)=3%的B4C-LaB6复合陶瓷综合力学性能较好,其相对密度、维氏硬度、抗弯强度和断裂韧性分别为 99.51%、36.56 GPa、547.43 MPa和 4.18 MPa∙m1/2.LaB6可细化B4C-LaB6复合陶瓷晶粒,同时提高其相对密度和断裂韧性.LaB6的增韧机制与裂纹偏转和晶粒裂解有关.
High-performance B4C-LaB6 composite ceramics fabricated via rapid hot press sintering
In order to solve the problem that boron carbide(B4C)is difficult for sintering densification and poor toughness,the B4C-LaB6 composite ceramics were fabricated via rapid hot press sintering at 2 000℃and 30 MPa with B4C and lanthana(La2O3)as raw materials.The effects of additive La2O3 content on the microstructures and mechanical properties of B4C-LaB6 composite ceramics were investigated,and the toughening mechanism of LaB6 was studied.The results show that the B4C-LaB6 composite ceramics with w(La2O3)=3%have better comprehensive mechanical properties,the relative density,Vickers hardness,bending strength,and fracture toughness reach 99.51%,36.56 GPa,547.43 MPa,and 4.18 MPa∙m1/2,respectively.LaB6 refines the grain,and improves the relative density and fracture toughness of the B4C-LaB6 composite ceramics.The toughening mechanism of LaB6 is related to crack deflection and grain cracking.

B4C-LaB6 composite ceramicgrain refiningcrystal boundaryrelative densitytoughening mechanism

徐志伟、彭可、袁铁锤

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中南大学 轻质高强结构材料国家级重点实验室,长沙 410083

B4C-LaB6复合陶瓷 晶粒细化 晶界 相对密度 增韧机制

国家自然科学基金资助项目中南大学中央高校基本科研业务费专项

522720771053320213869

2024

10.19976/j.cnki.43-1448/TF.2023075

粉末冶金材料科学与工程
中南大学

粉末冶金材料科学与工程

影响因子：0.578
ISSN：1673-0224
年,卷(期)：2024.29(1)
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