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Titanium silicon carbide Ti3SiC2 (Titanium silicon carbide) is a comprehensive ceramic material that not only has the properties of high temperature resistance, oxidation resistance, and high strength, but also has the electrical conductivity, heat conduction, workability, and plasticity of metal materials. Ti3SiC2 has the characteristics of metal, has good thermal conductivity and electrical conductivity at room temperature, relatively low Vickers hardness and high elastic modulus; it has ductility at room temperature and can be processed like metal. It has plasticity at high temperatures; at the same time, it has the properties of ceramic materials, with high yield strength, high melting point, high thermal stability and good oxidation resistance, and can maintain high strength at high temperatures. What is more significant is that it has a lower friction coefficient and good self-lubricating performance than the traditional solid lubricant graphite and molybdenum disulfide.
2. Main properties of Ti3SiC2 layered ceramic materials
Ti3SiC2 combines the characteristics of ceramics and metals. High elastic modulus, high melting point and high temperature stability reflect the properties of similar ceramics; and high electrical conductivity, high elastic modulus, high melting point and high temperature stability reflect similarities The nature of ceramics.
Research on the damage resistance of Ti3SiC2 shows that the sub-indentation indicates that there is a large pseudoplastic damage area. The reason is that Ti3SiC2 has multiple energy absorption mechanisms during contact damage, such as diffusion microcracks, crack deflection, grain pullout, and grain bending. Moreover, this type of material has good self-lubricating properties. This material has broad application prospects as high-temperature structural materials, brush materials, self-lubricating materials, heat exchange materials, etc. However, the relatively low hardness, wear resistance and low oxidation resistance of other ceramic materials limit its application in sensitive applications such as fatigue resistance, wear resistance and oxidation resistance.
Third, the application of Ti3SiC2 layered ceramic materials
(1) Biomedical applications
In dentistry, materials or components used in the oral environment are required to withstand long-term oxidation and maintain stability, but also need to have good workability and plasticity. Ti3SiC2 has both the performance of ceramic materials and metal characteristics, and at the same time has good biocompatibility, making it possible to apply to the human body. Ti3SiC2 can be machined into accurate-sized threads without lubricant, so it can be made into implants or restorations for clinical applications in oral medicine. Compared with zirconia (1.9x105MPa), the elastic modulus of Ti3SiC2 is closer to tooth enamel or dentin, which increases its potential for use in post or porcelain dental crowns. The Ti3SiC2 material obtained from self-propagating high temperature contains a porous structure, which may be easier to organize and combine with it. The low coefficient of friction makes it possible to apply to orthodontics to increase sliding and reduce friction resistance. Corrosion resistance and oxidation resistance are important conditions for the material to be used in the oral environment and maintain its stability. This material and porcelain powder are both ceramic materials, and the degree of bonding may be better than that of metal and porcelain. Therefore, the application range of porcelain dental crowns may be wider.
However, in the currently known Ti3SiC2 preparation methods, the preparation process must be improved to obtain a pure Ti3SiC2 block, and to understand more and more accurate characteristics of the material. Moreover, the biocompatibility and clinical practicability of the material still need further laboratory and clinical studies to confirm.
(2) Application on refractory materials
With the promotion of rapid firing technology in the ceramic industry, the cycle period of kiln furniture use is getting shorter and shorter, and the use conditions are more demanding. Therefore, it is necessary to continuously improve the thermal shock resistance of kiln furniture materials to meet the rapid firing technology of the ceramic industry. Development needs. As a kind of advanced refractory material, the quality of kiln furniture has an important influence on the quality of fired products. Ti3SiC2 ceramic material is not sensitive to thermal shock, and its unique layered structure and plastic behavior at high temperature can alleviate the effect of thermal stress. The residual strength of the material after the thermal shock of ^T=1400 is still above 300MPa, and the thermal shock resistance of the material can withstand a temperature difference of 900. At the same time, Ti3SiC2 ceramic material has the advantages of good chemical resistance, easy processing, and relatively low raw material cost, making it an ideal kiln furniture material to be developed.
Due to the excellent characteristics of spherical alumina in electrical, thermal and mechanical properties, it is widely used in the field of semiconductor electronic packaging.
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