采煤机截齿用WC—Co合金的磨损,强度与断裂

Wear, Strength and Fracture of WC-Co Cemented Carbides Used for Cutter in Coaling Mining Machine

摘要:

综述了采煤机截齿用ＷＣ－Ｃｏ硬质合金的磨损行为与机理、影响抗弯强度的各种因素、断裂韧性与粘结相平均自由程的关系以及断裂的不同方式。认为磨粒磨损、冲击疲劳和热疲劳是截齿的主要失效形式，并指出硬质合金中ＷＣ晶粒的邻接度、晶粒尺寸以及粘结相结构的控制是目前提高截齿寿命的主要方向。

Abstract:

he wear behaviors and mechanisms, the factors affecting the transverse rupture strength, the correlation between fracture toughness and the mean free path length of ductile phase, and the various fracture modes of WC-Co cemented carbides used for cutters in coaling mining machine are reviewed. It is suggested that abrasive wear, impact fatigue and thermal fatigue are the main types of failure of WC-Co cutters. It is pointed out that the major approaches to raising the service life of the cutter are the control of the she and the contiguous extent of the WC grain and the lattice type of the ductile phase.