摘要
运用扫描电镜等手段对神府煤田失效的采煤机截齿齿头（ＷＣＣｏ硬质合金）进行了失效分析，明确了该煤田截齿齿头的主要失效形式为崩齿、磨损和掉块。在断口分析的基础上阐明了造成失效的主要因素：冲击载荷达到或超过合金抗弯强度，煤层中的夹矸石对硬质合金的磨粒切削作用，周期载荷及热摩擦引起的冲击疲劳和热疲劳龟裂；并针对这些失效原因提出了延长截齿寿命的方法。
Failures of WC Co cemented carbides bits of cutters used in Shenfu coalfield were analysed carefully by scanning electron microscopy. It was suggested that bending rupture, abrasion and cracking were the main types of failure of WC Co bits. Based on the fractography, it is indicated that the causes of the failures of the bits are impact load stress which may reach or even exceed the transverse rupture strength of WC Co alloys, abrasive wear, surface impact fatigue and thermal fatigue. In accordance with these causes, some methods are suggested to prolong the lifetime of cutters.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
1998年第6期469-472,共4页
Chinese Journal of Rare Metals
