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以Yb_2O3-Al_2O3作为烧结助剂,采用烧结-热等静压工艺制备了具有高致密度和优异力学性能的Si_3N4-Si Cw复合材料,研究了Ti O2含量对Si_3N4-Si Cw复合材料致密化和力学性能的影响。结果表明:Ti O2的加入促进了Si_3N4-Si Cw复合材料的致密化。随着Ti O2含量的增加,Si_3N4-8%Si Cw复合材料的抗弯强度、断裂韧性和Vickers硬度均呈现出先提高后降低的变化趋势。当Ti O2含量(质量分数)为3%时,Si_3N4-8%Si Cw复合材料的相对密度和综合力学性能最佳,其相对密度、抗弯强度、断裂韧性和Vickers硬度分别为(99.5±0.1)%、(1 301±87) MPa、(7.8±0.1) MPa·m1/2、(16.2±0.1) GPa。Ti O2和Si_3N4之间的原位反应生成的Si O2和Ti N对Si_3N4-Si Cw复合材料的界面结合强度及力学性能产生了重要影响。
Abstract：Si_3N4–Si Cw composites were prepared via a sinter–hot isostatic pressing (sinter–HIP) process with Yb_2O3–Al_2O3 as sintering additives.The effect of titania (Ti O2) addition on the densification and mechanical properties of Si_3N4–Si Cw composites was investigated.The results show that the addition of titania enhances the densification of Si_3N4–Si Cw composites.The flexural strength,fracture toughness and Vickers hardness of Si_3N4–8%Si Cw composites firstly increase and then decrease with increasing titania content.Si_3N4–8%Si Cw composites containing 3%Ti O2 have a near-theoretical density and optimal mechanical properties (i.e.,the relative density of (99.5±0.1)%,the flexural strength of (1 301±87) MPa,the fracture toughness of (7.8±0.1) MPa·m1/2,and the Vickers hardness of (16.2±0.1) GPa).The formation of Si O2 and Ti N based on the in-situ reaction between Ti O2 with Si_3N_4contributes to the improvement of the interfacial strength of bonding between Si C whisker and Si_3N4 matrix as well as the mechanical behaviors of the composites.
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基本信息:
DOI：10.14062/j.issn.0454-5648.20210512
中图分类号:TB332
引用信息:
[1]张晶,孙峰,张伟儒,等.Ti O_2对Si_3N_4-Si C_w复合材料致密化和力学性能的影响[J].硅酸盐学报,2021,49(12):2790-2796.DOI:10.14062/j.issn.0454-5648.20210512.
基金信息:
国家重点研发计划(2017YFB0310602,2020YFB0407701)