高压制备多晶立方氮化硼复合材料

IF 0.9 4区材料科学 Q3 MATERIALS SCIENCE, CERAMICS

Processing and Application of Ceramics Pub Date : 2023-01-01 DOI:10.2298/pac2302157m

P. Mo, Jiarong Chen, Chao Chen, Haiqing Qin, F. Lin

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引用次数: 0

摘要

将立方氮化硼微粉与Ti、Al微粉按一定质量比在高温超高压条件下混合，制备了PCBN(多晶立方氮化硼复合材料)。采用x射线衍射和扫描电镜分析了样品的相组成和显微组织。研究了烧结温度对PCBN陶瓷力学性能和显微组织的影响。结果表明，在超高压(5.5GPa)和高温(1400 ~ 1500℃)下制备的PCBN陶瓷中，BN、AlN、TiN和TiB2相共存。随着烧结温度的升高，PCBN复合材料内部的孔隙和间隙逐渐消失，形成致密化结构。在1500℃时，复合材料的综合力学性能最佳，抗弯强度为1009MPa，显微硬度为35.8GPa。

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Fabrication of polycrystalline cubic boron nitride composites under high pressure

The PCBN (polycrystalline cubic boron nitride) composites were synthesized by mixing cubic boron nitride micropowders with Ti and Al micropowders at a certain mass ratio under high temperature and ultra-high pressure conditions. Phase composition and microstructure of the samples were analysed by X-ray diffraction and scanning electron microscopy. The effects of sintering temperature on the mechanical properties and microstructure of the PCBN ceramics were investigated. It was shown that BN, AlN, TiN and TiB2 phases coexist in the PCBN ceramics fabricated at ultra-high pressure (5.5GPa) and high temperature (1400-1500?C). With the increase of sintering temperature, pores and gaps inside the PCBN composites gradually disappeared and densified structure was formed. The best comprehensive mechanical properties of the PCBN composites were obtained at 1500 ?C with a flexural strength of 1009MPa and microhardness of 35.8GPa.

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来源期刊

Processing and Application of Ceramics MATERIALS SCIENCE, CERAMICS-

CiteScore

1.90

自引率

9.10%

发文量

审稿时长

10 weeks

期刊介绍： Information not localized