球磨时间对Ti(C0.7,N0.3)晶粒及Ti(C0.7,N0.3)基金属陶瓷组织和性能的影响
Effects of Milling Time on Ti(C<sub>0.7</sub>,N<sub>0.3</sub>) and Microstructure and Properties of Ti(C<sub>0.7</sub>,N<sub>0.3</sub>)-based Cermets
作者：杨天恩(四川大学 制造科学与工程学院, 四川 成都 610065)；熊计(四川大学 制造科学与工程学院, 四川 成都 610065)；李体军(四川大学 制造科学与工程学院, 四川 成都 610065)；郭智兴(四川大学 制造科学与工程学院, 四川 成都 610065)；郑启文(成都名钨科技有限责任公司, 四川 成都 610100)；孙磊(四川大学 制造科学与工程学院, 四川 成都 610065)；倪磊(四川大学 制造科学与工程学院, 四川 成都 610065)
Author：YANG Tianen(School of Manufacturing Sci. and Eng., Sichuan Univ., Chengdu 610065, China)；XIONG Ji(School of Manufacturing Sci. and Eng., Sichuan Univ., Chengdu 610065, China)；LI Tijun(School of Manufacturing Sci. and Eng., Sichuan Univ., Chengdu 610065, China)；GUO Zhixing(School of Manufacturing Sci. and Eng., Sichuan Univ., Chengdu 610065, China)；ZHENG Qiwen(Chengdu Mingwu Sci. and Technol. Co., LTD, Chengdu 610100, China)；SUN Lei(School of Manufacturing Sci. and Eng., Sichuan Univ., Chengdu 610065, China)；NI Lei(School of Manufacturing Sci. and Eng., Sichuan Univ., Chengdu 610065, China)
收稿日期：2016-07-09 年卷（期）页码：2017,49(1):123-131
期刊名称：工程科学与技术
Journal Name：Advanced Engineering Sciences
关键字：Ti(C<sub>0.7</sub>,N<sub>0.3</sub>)基金属陶瓷;球磨时间;晶格常数;微观应变;芯环结构
Key words：Ti(C0.7,N0.3)-based cermets;milling time;lattice parameters;micro-strain;core-rim structure Ti(C,N)
基金项目：国家自然科学基金重点项目资助（51634006）；国家自然科学基金面上项目资助（51575368）
中文摘要
球磨是金属陶瓷制备中的关键工艺，滚动球磨是目前成本较低、在实际工业生产中应用最广泛的球磨方式。为了量化分析球磨时间对Ti（C0.7，N0.3）基金属陶瓷的影响，采用湿混的方法在固定的球料比、球磨机转速和球磨介质添加量的条件下，研究球磨时间因素对Ti（C0.7，N0.3）的晶粒尺寸、应变和晶格常数的影响，以及对烧结后的Ti（C0.7，N0.3）基金属陶瓷微观组织和物理力学性能如收缩率、密度、硬度和横向断裂强度的影响。结果表明，随球磨时间增加，Ti（C0.7，N0.3）晶粒尺寸下降，而微观应变增加。同时，Ti（C0.7，N0.3）的晶格常数也增加，这与晶粒微观应变增加以及少量原料的氧化加剧有关。对烧结后的微观组织而言，球磨时间的增加导致金属陶瓷硬质相平均晶粒尺寸下降，但是当球磨时间达到72和96 h的时候，金属陶瓷中出现了0.1 μm左右的孔隙，这与球磨过程中氧含量的增加导致烧结时脱气反应以及Ti（C，N）硬质相和Ni粘接剂之间的润湿性变差有关。Ti（C0.7，N0.3）基金属陶瓷微观组织中白芯结构数量随球磨时间的增加明显减少了，芯中Mo含量的下降而Ti含量的增加是白芯数量下降的原因。环形相随球磨时间的增加变薄了，这一现象与不同尺寸的颗粒溶解度以及颗粒的均匀性有关。另外，随着球磨时间的增加，Ti（C0.7，N0.3）基金属陶瓷的硬度增加，而横向断裂强度随球磨时间的增加先增加后下降，其中孔隙对横向断裂强度的损害作用要大于晶粒细化对强度提高的作用。
英文摘要
The milling is a critical process of cermets-preparation.Roll milling is a low-cost and widely applied method in the industrial production.To analyze quantitatively the effects of milling time on the Ti(C0.7,N0.3)-based cermets,the grain size,micro-strain,lattice parameter of Ti(C0.7,N0.3), the microstructure and physical/mechanical properties such as shrinkage,density,hardness,transverse rupture strength of sintered Ti(C0.7,N0.3)-based cermets were investigated at fixed ball-to-powder weight ratio,milling speed,milling medium using wet-milling.The results showed that when the milling time increased, the grain size of Ti(C0.7,N0.3) descended but the micro-strain of Ti(C0.7,N0.3) rose,and the lattice parameters of Ti(C0.7,N0.3) increased,which was correlated with the increase of micro-strain and oxidation of some mixed materials.In the microstructure of sintered bodies,the average grain size of the hard phases declined with the milling time.Some porosities of around 0.1 μm were formed in the cermets when the milling time reached 72 and 96 h,which was relevant with the degassing reaction due to increase of oxygen contents and degradation of the wettability between Ti(C,N) and Ni.The numbers of bright cores in the microstructure drop owing to Mo-content declining but Ti-content increasing. The rims got thinner with the milling time extended, which was related with the solubility of the particles having different sizes and their homogeneity.Additionally,the hardness of the Ti(C0.7,N0.3)-based cermets was raised. The transverse rupture strength of the cermets was elevated initially but then reduced, and the detrimental effect of porosities on the strength outweighed the favorable effect of grain refinement.
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