【摘要】 采用硼化法制备的TiBCN导电陶瓷粉末成功热压烧结为块体材料。设置不同电火花线切割加工工艺参数,切割TiBCN块材。通过加工表面质量分析及SEM微观形貌观察,研究了线切割加工表面质量的影响因素及材料蚀除机制。研究结果表明:线切割加工TiBCN陶瓷材料,可以获得质量良好的加工表面,最小表面粗糙度Ra为0.4μm;脉冲电流Ip和脉间ti是影响加工表面质量的主要影响因素;虽然设置长脉宽te有利于提高蚀除效率,但脉间过小,易形成表面裂纹。TiBCN块材线切割加工最佳参数设置范围为:Ip=2~6,te=20~22μs,ti=65~75μs。线切割加工TiBCN陶瓷材料,有三种蚀除机理:剥离、熔融/再凝固、气化蒸发。更多还原

【Abstract】 TiBCN powder synthesized by boronizing was successfully sintered into the bulk sample by hot pressing.Then the bulk sample was machined by wire-cut EDM with variable processing parameters.By analyzing machined surface quality and observing SEM micro-morphology,the main factors which influence on quality of machined surface cut by wire-cut EDM and material removal mechanism were studied.The results show that it is possible to obtain suitable quality of TiBCN machined surface through wire-cut EDM processing,the minimum roughness Raof machined surface obtained is0.4μm;Discharge Current Ipand Pulse Interval tiare the main factors;longer Discharge Duration teis more favorable to increase removal rate,but surface crack are more easily formed if Pulse Interval is too short.The best range of processing parameters of TiBCN bulk sample cut by EDM are Ip=2-6,te=20-22μs and ti=65-75μs.Three types of material removal mechanism are identified,spalling,melting/resolidification and evaporation.更多还原