摘要
为了满足矿山、电力等部门对大量使用的某些备件整体应具有一定的韧性和强度 ,而表面应具有高硬度、高耐磨性的要求 ,设计并通过钎焊法在普通铸钢件表面制备了硬质颗粒增强复合合金材料。试验研究了耐磨相WC颗粒的不同粒度配比和体积分数对复合合金组织及耐磨性的影响 ,并将研究结果应用于中速磨煤机耐磨辊胎和盘瓦。试验研究表明 :提高复合合金中耐磨相的密实度即增大其松装密度以及在一定范围内增大其颗粒体积分数 ,可有效地提高复合合金组织致密性及耐磨性 ,当WC颗粒松装密度为 10 3 2 g/cm3 ,体积分数为 5 4%时 (体积分数可在 2 5 %～ 5 4%之间变化 ) ,复合合金耐磨性最好。应用结果表明 :用钎焊法制备的复合合金辊胎和盘瓦具有耐磨层厚 (10～ 3 0mm )、质量优、性能价格比高、经济效益显著及耐磨性好等优点 ,其耐磨性是铸钢的 3 5倍以上 ,是高铬铸铁及镍硬Ⅳ号铸铁 15倍以上。
Many spare parts used in various industries like mine, electric power and so on are required to have enough toughness and strength as a whole ,and have high surface hardness and high surface wear resistance. In order to meet the demands above mentioned, composite alloy material reinforced with hard grains has been developed on surface of common steel castings by self designed brazing process. The effects of different granularity proportion and volume fraction of WC grains as wear resistant phase on microstructure and abrasiveness of composite alloy were studied by experiment. The research results were then applied to wear resisting supporting roller and disc pad used in middle speed coal crusher. Experimental research shows that microstructure compactness and wear resistance of composite alloy can be significantly improved when compactness (bulk density) and volume fraction of wear resistant phase in composite alloy increase within limits. In the present paper, composite alloy is provided with better abrasiveness when bulk density of WC grains is 10 32 g/cm 3 and their volume fraction varies between 25%～54%. Besides, wear resistance of composite alloy is up to the best when volume fraction of WC grains is 54%. Applied results prove that composite alloy supporting roller and disc pad prepared by brazing process have advantages of thick(10～30mm)and high quality wear resistant cladding, convenient installation, high property to price ratio, obviously economic effect and good wear resistance ,etc. The wear resistance of composite alloy is 35 times more than that of cast steel and 15 times more than that of high chromium cast iron and that of nickel hard cast iron No.Ⅳ.
出处
《铸造》
CAS
CSCD
北大核心
2002年第10期603-606,共4页
Foundry
关键词
复合合金
硬质颗粒
颗粒粒度
体积分数
耐磨性
磨煤机
composite alloy
hard alloy grain
particulate granularity
volume fraction
wear resistance
coal crusher
