摘要
利用CEAST 9340落锤式冲击试验机,通过高周期疲劳方式加载,测试冲击功、球表面积、WC-Co硬质合金球齿衬底厚度及聚晶金刚石层(PCD)层厚度对复合片球齿抗冲击性能的影响;利用ANSYS软件对PCD层厚度对球齿抗冲击性能的影响进行有限元分析;利用JSM-6360LV型扫描电子显微镜对样品断口形貌进行观察。研究结果表明:球齿的冲击破碎率随冲击功的增大而升高,随WC-Co硬质合金球齿衬底厚度增加及PCD层厚度减小而下降;在相同冲击功条件下,增大球齿球表面积则导致冲击破碎率下降;球齿抗冲击性能随WC-Co硬质合金球齿衬底厚度减小及PCD层厚度增加而下降。直径为14 mm和16 mm球齿部分可满足低风压抗冲击性要求但无法满足高风压抗冲击性能要求。
The effects of the impact energy, the sphere area, and the thickness of WC-Co substrate and polycrystal diamond （PCD） layer on the shock resistance of polycrystalline diamond compacts button were tested by using CEAST9340 shock testing machine with high periodic fatigue loading. Then finite-element analysis were carried out to study the impacts of PCD layer thickness on the shock resistance of spherical crown button. SEM was used to observe the morphology of sample fracture. The results show that the impact crushing rate of spherical crown button increases with increasing impact energy and decreases with increasing thickness of cemented carbide. With the same amount of impact energy, the impact crushing rate increases with decreasing sphere surface area. The shock resistance of spherical crown button decreases with increasing thickness of cemented carbide and decreasing thickness of WC-Co substrate. 14 mm and 16 mm diameter button insert can only partially meet low air pressure requirement and will fail high air pressure requirement.
出处
《粉末冶金材料科学与工程》
EI
北大核心
2014年第3期479-485,共7页
Materials Science and Engineering of Powder Metallurgy
基金
国家自然科学基金(51074180)
关键词
潜孔钻头
聚晶金刚石球齿
冲击损伤
有限元分析
界面结构
DTH bit
PDC spherical crown button
shock damage
finite-element analysis
Interface Structure
作者简介
通讯作者：张绍和，教授，博士。电话：13975157151；E—mail：zhangshaohe@163．com
