Zhang Mengmeng, Wei Boxin, Liang Lanqing, Fang Wenbin, Chen Lei, Wang Yujin
School of Materials Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150040, China.
Heilongjiang Provincial Key Laboratory of Light Metal Materials Modification and Green Forming Technology, Harbin University of Science and Technology, Harbin 150040, China.
Materials (Basel). 2023 Mar 7;16(6):2145. doi: 10.3390/ma16062145.
Dense and enhanced mechanical properties (Zr, Ti)(C, N)-based composites were fabricated using ZrC, TiCN, and Si powders as the raw powders by reactive hot-pressing at 1500-1700 °C. At the low sintering temperature, both (Zr, Ti)(C, N) and (Ti, Zr)(C, N) solid solutions were formed in the composites by adjusting the ratio of ZrC to TiCN. During the sintering process, the Si added at a rate of 5 mol% reacted with ZrC and TiCN to generate SiC. With the increase in Si addition, it was found that the residual -ZrSi was formed, which greatly reduced the flexural strength of composites but improved their toughness. The reaction and solid-solution-driven inter-diffusion processes enhanced mass transfer and promote densification. The solid solution strengthening and grain refinement improved the mechanical properties. The ZrC-47.5 mol% TiCN-5 mol% Si (raw powder) composite possessed excellent comprehensive performance. Its flexural strength, Vickers hardness, and fracture toughness were 508 ± 33 MPa, 24.5 ± 0.7 GPa, and 3.8 ± 0.1 MPa·m, respectively. These reached or exceeded the performance of most (Zr, Ti)(C, N) ceramics reported in previous studies. The lattice distortion, abundant grain boundaries, and fine-grained microstructure may make it possible for the material to be resistant to radiation.
采用ZrC、TiCN和Si粉末作为原料粉末，通过在1500 - 1700℃下进行反应热压制备了致密且机械性能增强的(Zr, Ti)(C, N)基复合材料。在低烧结温度下，通过调整ZrC与TiCN的比例，在复合材料中形成了(Zr, Ti)(C, N)和(Ti, Zr)(C, N)两种固溶体。在烧结过程中，以5 mol%的比例添加的Si与ZrC和TiCN反应生成SiC。随着Si添加量的增加，发现形成了残余的ZrSi，这大大降低了复合材料的抗弯强度，但提高了其韧性。反应和固溶体驱动的互扩散过程增强了质量传递并促进了致密化。固溶强化和晶粒细化改善了机械性能。ZrC - 47.5 mol% TiCN - 5 mol% Si（原料粉末）复合材料具有优异的综合性能。其抗弯强度、维氏硬度和断裂韧性分别为508±33 MPa、24.5±0.7 GPa和3.8±0.1 MPa·m。这些性能达到或超过了先前研究中报道的大多数(Zr, Ti)(C, N)陶瓷的性能。晶格畸变、丰富的晶界和细晶微观结构可能使该材料具有抗辐射能力。
