黄绍锋,甘志伟,胡宁飞,陆静,李东旭.核壳结构SiC@Ti(C,N)复合材料的制备及性能研究[J].表面技术,2023,52(4):410-416, 426.
HUANG Shao-feng,GAN Zhi-wei,HU Ning-fei,LU Jing,LI Dong-xu.Preparation and Properties of Core-shell SiC@Ti(C,N) Composites[J].Surface Technology,2023,52(4):410-416, 426 |
| 核壳结构SiC@Ti(C,N)复合材料的制备及性能研究 |
| Preparation and Properties of Core-shell SiC@Ti(C,N) Composites |
| |
| DOI：10.16490/j.cnki.issn.1001-3660.2023.04.037 |
| 中文关键词: 碳化硅陶瓷 碳氮化钛 断裂韧性 核壳结构 显微硬度 增韧机理 |
| 英文关键词:SiC ceramic Ti(C,N) fracture toughness core-shell structure microhardness toughening mechanism |
| 基金项目:国家自然科学基金(51975222);亚稳材料制备技术与科学国家重点实验开放课题(202207) |
|
|
| Author | Institution |
| HUANG Shao-feng | College of Materials Science and Engineering,Fujian Xiamen 361021, China ;Institute of Manufacturing Engineering, Huaqiao University, Fujian Xiamen 361021, China |
| GAN Zhi-wei | College of Materials Science and Engineering,Fujian Xiamen 361021, China |
| HU Ning-fei | College of Materials Science and Engineering,Fujian Xiamen 361021, China |
| LU Jing | Institute of Manufacturing Engineering, Huaqiao University, Fujian Xiamen 361021, China |
| LI Dong-xu | College of Materials Science and Engineering,Fujian Xiamen 361021, China |
|
| 摘要点击次数: |
| 全文下载次数: |
| 中文摘要: |
| 目的 碳化物陶瓷材料因优异的力学性能在精加工和切削行业具有广阔的应用前景，制备特定结构的碳化物复合材料能够改善材料的综合性能。方法 通过化学法在SiC表面包覆纳米Ti(C,N)，无压烧结制备了具有核壳结构的SiC@Ti(C,N)复合材料。采用XRD、SEM、TEM和EDS等方法，研究退火温度和原料配比对复合材料的成分组成和微观结构的影响。通过同步热分析(TG-DSC)比较单相和复合材料抗氧化性能差异。使用显微维氏硬度计和万能材料试验机测试材料力学性能的变化趋势及原因。构建核壳颗粒致密化模型，分析复合材料的致密化机制和增韧机理。结果 随着烧结温度的升高，其显微硬度先升高后降低。随着SiC比例的增大，其显微硬度、压缩强度和断裂韧性均先增大后减小。在1 250 ℃下，制备的原料质量比为11:1的SiC@Ti(C,N)复合材料具有最大显微硬度、压缩强度和断裂韧性，分别为3 273HV、434 MPa、4.38 MPa.m1/2。结论 通过比较复合材料和单一碳化物材料的力学性能发现，具有核壳结构的SiC@Ti(C,N)复合材料综合性能得到提升。纳米Ti(C,N)填充复合材料孔隙并促进致密化烧结，从而提升了复合材料的强度;通过Ti(C,N)骨架的偏转裂纹实现增韧。 |
| 英文摘要: |
| Carbide ceramic materials present widely applications in fine polishing and cutting industries due to their excellent mechanical properties. The preparation of carbide composite materials with specific structure will improve the comprehensive properties of materials. SiC@Ti(C,N) composites with core-shell structure were prepared by chemically coating nano-Ti(C,N) on the surface of 10 micron SiC and press-free sintering at low temperature in a tubular furnace. XRD, SEM, TEM and EDS were used to study the effects of annealing temperature and raw material ratio on the composition and microstructure of composite materials. The difference of oxidation resistance between single-phase and composite materials was compared by thermal analysis. The variation trend and reason of mechanical properties of composite materials were tested by micro-Vickers hardness tester and universal material testing machine. A model of core-shell partical densification was built to discussed the densification and toughened mechanisms of SiC@Ti(C,N) composites. The composition and microstructure of the composites are the core-shell structure of thin sheet Ti(C,N) coated SiC particles, which improves the oxidation resistance of the composites. As the sintering temperature increases, its microhardness increases firstly and then decrease. With the mass ratio of SiC/Ti(C,N) as a variable, the experimental results show that as the proportion of SiC increases, the microhardness, compressive strength and fracture toughness increase firstly and then decrease, the microhardness of SiC@Ti(C,N) composites prepared under the optimal experimental conditions surpasses that of SiC. The results show that the SiC@Ti(C,N) composites with raw material ratio of 11∶1 fabricated at 1 250 ℃ have maxium microhardness, compressive strength and fracture toughness, which are 3 273HV, 434 MPa and 4.38 MPa.m1/2 respectively. The properties of SiC@Ti(C,N) composites with core-shell structure are improved by comparing the mechanical properties of composites and single carbide materials. The densification mechanism of this composites is the pore in the composites was filled by nano Ti(C,N) and densification of SiC was promoted, which helps the formation of Ti(C,N) framework and toughen composites by its crack deflection. Before sintering, there are still more pores between the particles in the composite, resulting in low density. As the calcination temperature rises above 1 200 ℃, favorable conditions are provided for the energy release of Ti(C,N) atoms, which promotes the migration of powders. Meanwhile, nano-Ti (C,N) grains grow up and dissolve with each other, which increases the contact area between powders, gradually diffuses into the pores and fills them, resulting in the decrease of pores. At the same time, SiC particles were pushed to shrink to densification. The main function of Ti(C,N) with low modulus is to deflect crack and toughen the composite. After cooling, a stress field is generated at the interface of grain boundary of the two phases, resulting in weak interfacial bonding. When the crack expands to the interface, the crack will extend along the weak interfacial bonding and deflect. When the crack propagates inside the material, the crack will extend along the Ti(C,N) skeleton bending, which makes the crack propagation path become tortuous and the propagation resistance is greatly increased, thus greatly reducing the possibility of the internal SiC particles directly fracture to form a long straight crack. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|
渝公网安备 50010702501715号