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 Technology

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含量为8%时达到最大值，韧性KIC则随Ni含量的增加迅速增加到8.5 MPa.m1/2。

Abstract:

Ultrafine WC-Ni cemented carbides were manufactured by coupled multi-physical fields activated technology to study the effect of the Ni content to sintering of WC-Ni cement carbide. It was found that multi-physical fields activated technology is an effective method to manufacture WC-Ni cemented carbide, and when the content of Ni increased, the micro pore diminished, and densification of the samples increased, but the particle size of WC increased. In addition, firstly, the Micro hardness increases quickly and then decrease with the increasing of the Ni content. At the same time, the fracture toughness (KIC) increase sharply to 8.5 MPa.m1/2 with the increase of the Ni content.