Preparation And Application Of The Two-dimensional Nano Ti₃SiC₂

Ti3SiC2material combines the properties of both metal and ceramics, with goodthermal conductivity, electrical conductivity, self-lubrication, wear resistance, highfracture toughness, high temperature oxidation resistance and other excellent propert-ies, with a broad application prospect. According to the theoretical calculation, thetwo-dimensional ultra-thin MAX phase materials have more excellent performancethan the bulk materials. In this paper, high purity Ti3SiC2materials were synthesizedby Self-Propagation high temperature synthesis, on the basis of this study2D ultrathinTi3SiC2material were preparation. The effects of process parameters on the2D ultra-thin material of Ti3SiC2preparation, and2D ultra-thin Ti3SiC2material as reinforcedphase in PTFE matrix composite, and its application as anode material in lithium ionbatteries was investigated.taking3Ti/1.5Si/2C/0.2Al powder as raw material, Ti3SiC2materials with highpurity were synthesized by Self-Propagation high temperature synthesis, the purity ofTi3SiC2was estimated up to93.6%by K-. Appropriate amount of Al additives can beformed as soon as the liquid phase in the reaction system, accelerating the diffusion ofSi and Ti, and promote the formation of an intermediate phase, so as to promote thesynthesis of Ti3SiC2. With Ti3SiC2powder prepared as raw material, using NMP assolvent, by high-energy ball milling and ultrasonic treatment, the two-dimension-al nano Ti3SiC2thin layer was successful prepared, nanosheet diameter100-300nm,thickness is20nm. Ball milling treatment and ultrasound is beneficial to the two-dimensional Ti3SiC2preparation. the most excellent process parameters of theexperiments for300r/min milling2h, ultrasonic120min.Two dimensional Ti3SiC2nano material could improve the hardness of PTFEcomposites, the hardness of the composites increases with the increase of Ti3SiC2content. Two-dimensional Ti3SiC2nanomaterials add significantly improved the Tri-bological performance of PTFE, with the increase of Ti3SiC2content in the frictioncoefficient of the composite decreases, wear-resisting performance greatly increased.Pure PTFE mainly adhesive wear and2D-nano Ti3SiC2/PTFE composites mainly ma-nifested as fatigue wear.Ti3SiC2plays the role of the main reason is wear-resistantfiller particlesin the matrix and PTFE molecular interaction prevents large bandedstructure of PTFE damage, as well as particles hard filler having bearing certain uni-form load. In addition, in the process of friction, promote the formation of Ti3SiC2 composites in the counterpart surface fine stability transfer film, played a directcont-act isolation composite materials and parts, thereby reducing the wear rate of PTFE.Two-dimensional Ultra-thin Ti3SiC2material has a high capacity, superior per-formance, stability, cycle performance and rate performance as a lithium-ion anodematerial. In the80mA/g,200mA/g,400mA/g,800mA/g,1600mA/g and4000mA/gcurrent density, respectively, the Stable capacity reached460mAh/g,350mAh/g,310mAh/g,280mAh/g,240mAh/g and184mAh/g. by virtue of its large specific surfacearea and unique structure performance was significantly better than the micron levelTi3SiC2material.