论文部分内容阅读
为了选择更合适的钻头齿面强化材料，对多种粒度的球状烧结碳化钨和粒状铸造碳化钨堆焊层分别作了磨料磨损试验，以评价其抗磨性能。用 Ｎｉ 基合金作钎料，在高真空度下将硬质合金颗粒焊至２０ Ｎｉ４ Ｍｏ 表面。试验采用多种冲击能量，磨料介质为石英砂、水和少量悬浮剂，用天平称出磨损失重。结果表明：球状烧结碳化钨或不同类型和粒度混合的碳化钨堆焊层都比现行采用的粒状铸造碳化钨具有更好的抗冲击磨料磨损能力。用球状烧结碳化钨代替粒状铸造碳化钨作钢齿钻头齿面堆焊材料是提高齿面强化效果的有效途径。
In order to select a more suitable bit tooth surface strengthening material, a variety of particle size of spherical sintered tungsten carbide and granular cast tungsten carbide surfacing were made abrasive wear test to evaluate its anti-wear properties. Using Ni-based alloy as brazing filler metal, the cemented carbide particles are welded to the surface of 20 Ni4 Mo under high degree of vacuum. The test uses a variety of impact energy, abrasive media quartz sand, water and a small amount of suspending agent, weighed out wear and tear weight loss. The results show that ball-shaped sintered tungsten carbide or different types and sizes of mixed tungsten carbide hardfacing layers have better impact abrasion resistance than the currently used granular cast tungsten carbide. Spherical cemented tungsten carbide instead of granular cast tungsten carbide as a tooth bit steel surfacing material is an effective way to improve the tooth surface strengthening effect.