多物理场耦合烧结制备超细WC-Ni硬质合金致密化机理  

Fabrication of Ultrafine WC-Ni Cemented Carbide by Coupled Multi-physical Fields Activated Sintering

作　　者：周宇[1] 姜薇[1] 陈依桐 杨屹[1] 杨刚[1] 尹德强[1] 刘剑[1] 

机构地区：[1]四川大学,四川成都610065

出　　处：《稀有金属材料与工程》2017年第2期561-564,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51275322)

摘　　要：为了研究Ni含量对WC-Ni硬质合金性能的影响,利用多物理场耦合烧结方法制备不同Ni含量的超细WC-Ni硬质合金,结果显示:多物理场耦合烧结方法可以成功制备WC-Ni硬质合金,随着Ni含量增加,WC-Ni硬质合金的组织更加致密,试样的相对致密度逐渐增加,但WC颗粒发生了轻微的长大现象;同时,显微硬度先增后减,在Ni质量分数为8%时达到最大值,断裂韧性K_(IC)则随Ni含量的增加迅速增加到8.5 MPa·m^(1/2)。Ultrafine WC-Ni cemented carbides were fabricated by coupled multi-physical fields activated sintering and the effect of the Ni content on properties of WC-Ni cement carbide was studied.It is found that multi-physical fields activated sintering is an effective method to prepare WC-Ni cemented carbide.When the content of Ni increases,the micro pore diminishes,and densification of the samples increases,but the particle size of WC increases;at the same time,the micro hardness increases quickly to the peak value at 8wt%Ni content and then decreases.In addition,the fracture toughness（K_（IC）） increases sharply to 8.5 MPa·m^1/2 with the increase of the Ni content.

关 键 词：多物理场耦合烧结 WC-NI Ni含量 显微硬度 断裂韧性 

分 类 号：TG135.5[一般工业技术—材料科学与工程]