成型压力对微波烧结的复杂Ti(C,N)基金属陶瓷刀具力学性能和显微结构的影响

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采用微波烧结技术制备了复杂刃形Ti(C,N)基金属陶瓷刀具,利用仿真和实验的方法研究了压制压力对复杂Ti(C,N)基金属陶瓷刀具素坯密度分布均匀性、残余应力,以及素坯烧结后刀具前/后刀面致密度、力学性能和微观组织的影响.结果表明:模压成型和微波烧结相结合的技术可制备高性能复杂陶瓷刀具;刃口区域的密度值小于非刃口区域的密度值,其差值随着压制压力的提高先增大后减小.当压制压力≤200 MPa时,前后刀面的相对密度和力学性能相差不大;压制压力≥300MPa时,前刀面的相对密度和力学性能均优于后刀面,但过高的压制压力会导致刀具内部产生裂纹;三维槽型Ti(C,N)基金属陶瓷刀具的最佳压制压力为400 MPa.“,”A complex-shaped titanium carbonitride (Ti(C, N))-based cermet tool was prepared by microwave sintering. The effects of molding pressure on density distribution and residual stress of green compact, relative density, mechanical properties, and microstructure of the sintered compact tool were studied. The results indicated that a high-performance complex-shaped ceramic tool can be prepared using the combined technology of molding and microwave sintering. The density of the cutting edge was lower than that of the body of the tool. The difference increased first and then decreased with the increase in molding pressure. When the molding pressure was lower than 200 MPa, minimal differences between rake and flank faces with respect to relative density and mechanical properties were noted, while the relative density and mechanical properties of rake face were higher than that of flank face when the molding pressure was higher than 300 MPa. However, excessive molding pressure resulted in cracks within the tool. The optimal molding pressure for preparation of a Ti(C, N)-based cermet tool with three-dimensional breaker was 400 MPa.
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