工艺参数对原位合成WC_P增强铁基复合材料的影响  

Effect of process parameters on in-situ synthesis of WC_P/Fe composites

作　　者：牛立斌[1] 王晓刚[1] 樊子民[1] 

机构地区：[1]西安科技大学材料科学与工程学院,陕西西安710055

出　　处：《材料热处理学报》2014年第3期24-29,共6页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(50174046);陕西省科技统筹计划项目(KTCQ1-17);西安市技术转移工程项目(CX1261)

摘　　要：以金属钨丝网和灰口铸铁为原材料,采用离心铸造技术,通过调整钨丝的中心间距和灰口铸铁熔体的浇铸温度,原位合成WC颗粒增强铁基复合材料。利用XRD、SEM以及两体销盘磨损试验机对所得复合材料复合区的物相种类、显微组织以及磨损性能进行分析研究,结果表明:随浇铸温度的提高,WC衍射峰的强度增强,反应程度增大,WC量不断增多。当钨丝中心间距为0.5 mm,浇铸温度为1400℃时,得到较理想的WC颗粒弥散分布于铁基体中的复合材料;在浇铸温度不变时,随中心距的增大,复合材料的磨损率呈现出先降低后略微升高的趋势。Using tungsten wire and gray cast iron as reactive materials, through adjusting the center distance of the tungsten wires and changing the pouring temperatures of the gray cast iron molten, the Fe-based composites reinforced by tungsten carbide （WC） particles were in-situ synthesized by means of centrifugal casting technique. The phases, microstrueture and wear performances of the composite were observed by X-ray diffraction, scanning electron microscopy （SEM） and two-body abrasive wear tests. The results show that the intensity of diffraction peak, the amount of the WC particles, as well as the reactive degree of tungsten wires increase with increasing pouring temperature. The perfect composite in which the reinforcements disperse in the matrix can be obtained under the center distance of O. 5 mm and the pouring temperature of 1400 ℃. For the composites obtained under the constant pouring temperature and gradually increasing the center distance, the wear rates present firstly decrease and then slightly increase.

关 键 词：复合材料 碳化钨 原位合成 磨损 

分 类 号：TB331[一般工业技术—材料科学与工程]