煤矸石渗剂渗硅层耐磨性研究

Research on Wear Resistance of Gangue Infiltration Agent Siliconizing Layer

为提高材料表面的耐磨性,利用固体粉末法,以煤矸石为主渗剂,铝粉和镁粉为还原剂,在Q235钢表面制备渗硅层。煤矸石渗硅层中有Fe3Si、Al2Si Fe等新相生成;渗硅层主要由含Si的α固溶体组成,厚度可达100μm;渗硅层硬度达348.7 HV0.1,基体为134.5 HV0.1;磨粒磨损性能测试结果表明,渗硅层在0#、01#和02#金相砂纸下耐磨性较基体分别提高2.79倍、2.37倍和2.03倍;在20 N、40 N和70 N的附加载荷下耐磨性分别提高2.03倍、2.18倍和2.82倍;渗硅层在低速(60 r/min)和高速(120 r/min)下耐磨性分别提高2.02倍和2.53倍。煤矸石渗硅具有可行性,能够提高低碳钢表面综合性能。

Q235 steel is siliconized by using the method of solid power while gangue is taken as the main agent, pure Al and Mg power as reducing agent Fe3Si,Al2SiFe and other new phase are produced in layer which is made up with α phase. The thickness of layer is about 100μm. Micro hardness of layer is 348.7HV0.1, the base is only 134.5HV0.1. The result of abrasive wear resistance indicates that： when samples wear on the # 0, #01 and #02 metallographic sandpaper, the wear resistance of silicon inifltration layer increase 2.79 times, 2.37 times and 2.03 times compared with the base; when samples wear under 20N, 40N and 70N additional load, the wear resistance increase 2.03 times, 2.18 times and 2.82 times; when samples wear at low speed （60 r/min） and high speed （120 r/min）, the wear resistance increase 2.02 times and 2.53 times. Coal gangue siliconizing is feasible, it can improve the comprehensive properties of low carbon steel surface.