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TiN对热压烧结Si3N4–TiN复相陶瓷显微结构和力学性能的影响
作者：魏万鑫 于俊杰 刘伟键 郭伟明 林华泰 
单位：(广东工业大学机电工程学院 广州 510006) 
关键词：氮化硅陶瓷 氮化钛来源 相组成 显微结构 力学性能 
分类号：TB32
出版年,卷(期):页码：2020,48(3):0-0
DOI：
摘要：

 研究了TiN的来源(TiN粉、TiO2粉和TiO2溶胶)对热压烧结Si3N4–TiN复相陶瓷的相组成、显微结构与力学性能的影响。结果表明，当以TiN粉为第二相添加剂时，试样中仅检测到β-Si3N4和TiN相，Si3N4晶粒与TiN颗粒较粗大，硬度、强度和断裂韧性分别为(15.6±0.3) GPa、(1 058±78) MPa和(11.2±0.6) MPa·m1/2；当以TiO2粉为第二相添加剂时，除了β-Si3N4和TiN相，还检测到O′-Sialon相，O′-Sialon相的含量为8.7% (质量分数)，Si3N4晶粒与TiN颗粒均匀细小，样品硬度提高到(16.7±0.4) GPa，强度和断裂韧性没有显著变化，分别为(986±76) MPa和(11.3±0.4) MPa·m1/2；当以TiO2溶胶为第二相添加剂时，同样检测到O′-Sialon相，O′-Sialon相的含量为12.5%，Si3N4晶粒与TiN颗粒均匀细小，样品硬度较高为(16.6±0.5) GPa，其强度和断裂韧性较低分别为(788±94) MPa和(10.2±1.0) MPa·m1/2。以TiO2粉为第二相添加剂时，可获得显微结构均匀细化、综合力学性能较佳的Si3N4–TiN复相陶瓷材料。

 The effect of TiN source (i.e., TiN powder, TiO2 powder and TiO2 sol) on the phase compositions, microstructures and mechanical properties of hot-pressed Si3N4–TiN ceramics was investigated. The results show that only β-Si3N4 and TiN phases are detected for the sample with TiN powder. The sizes of β-Si3N4 and TiN grains are large, the Vickers hardness, flexure strength, and fracture toughness are (15.6±0.3) GPa, (1 058±78) MPa, and (11.2±0.6) MPa·m1/2, respectively. However, the O'-Sialon phase appears in the sample with TiO2 powder in addition to β-Si3N4 and TiN phases, and the content of O'-Sialon is 8.7wt%. Due to the relatively fine grains of β-Si3N4 and TiN, the Vickers hardness increases to (16.7±0.4) GPa, and the flexure strength and fracture toughness are (986±76) MPa and (11.3±0.4) MPa·m1/2, respectively. Moreover, the O'-Sialon phase appears in the sample with TiO2 sol, the content of O'-Sialon is 12.5wt%, and the size of β-Si3N4 and TiN grains is finer, having a higher Vickers hardness (i.e., 16.6±0.5 GPa), and relatively lower flexure strength (i.e., 788±94 MPa) and fracture toughness (i.e., 10.2±1.0 MPa·m1/2). Si3N4–TiN ceramics with uniformly fine microstructures and good mechanical properties can be thus obtained with TiO2 powder.
基金项目：
国家重点研发计划(2017YFB0310400)。
作者简介：
参考文献：

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