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,1004, 北京科技大学学报 第29卷 [9]Me L P.Cabe S G.Effect of microst ructure on t he erosion of [10]王新林，石世宏，郑启光.激光熔覆层凝固特征与凝固组织 steel by solid particles.Wear.1985,105:257 控制研究.应用激光，2001,21(3)：164 Microstructure and erosive wear properties of Ni-based alloy coating produced by plasma cladding LIU Shenglin,SUN Dongbai,FAN Zishuan,WANG Guogang,YU Hongying Beijing Corrosion and Protection Center,University of Seience and Technology Beijing.Beijing 100083.China ABSTRACI Using Ni46 alloy powder as the raw material,the erosive wear resistance of stainless steel was im- proved with Ni-based alloy coating onto the stainless steel by plasma cladding.The coating s microstructure was studied and its microhardness was measured using an HVS1000 micro-hardness tester.The erosive wear resis- tance of the coating in a slurry erosion tester was investigated.The results show that the mechanical properties of metal materials influenced their erosive wear resistance:the larger the hardness value of the material is,the better the anti erosive wear properties are.On the same experimental condition,the erosive wear rates of the materials follow this rule:Ni-based coatingOCr13Ni5Mo 1Cr18NiTi.The improvement in erosion resis- tance can be attributed to the solution strengthening of y-Ni matrix and the presence of large amounts of borides and carbides which withstood the impingement of slurry erosion. KEY WORDS Ni-based alloy coating:plasma cladding:microstructure:microhardness:slurry erosion (上接第974页) Characteristics and application of three phase foam in spontaneous combustion of coal QIN Botao,WANG Deming State Key Laboratory for Coal Resources and Mine Safety China University of Mining and Technology.Xuhou 221008.China ABSTRACI The characteristics of three phase foam in mine fire control were introduced,its covering and inhi- bition were analyzed,and experiments on extinguishing the top fire in a porous medium were carried out.The results show that three phase foam can cover the whole goaf and prevent everyw here fire by pervasion and accu- mulation.According to the characteristics of goaf and three phase foam,technical parameters,such as diffused distance of three-phase foam,length between working face and pipe bottom and durative time for spontaneous combustion of coal,were deduced.Based on them,three phase foam was applied in the workface N2703 of Dax- ing coal mine in China,and laying pipes in advance in goaf was carried out.The effect of application shows that three phase foam can successfully prevent spontaneous combustion of coal in the working face. KEY WORDS three phase foam:mine fire control;pervasion;embedded pipe［9］ Mc L PCabe S G．Effect of microst ructure on t he erosion of steel by solid particles．Wear1985105：257 ［10］ 王新林石世宏郑启光．激光熔覆层凝固特征与凝固组织 控制研究．应用激光200121（3）：164 Microstructure and erosive wear properties of N-i based alloy coating produced by plasma cladding LIU ShenglinSUN DongbaiFA N ZishuanWA NG GuogangY U Hongying Beijing Corrosion and Protection CenterUniversity of Science and Technology BeijingBeijing100083China ABSTRACT Using Ni46alloy powder as the raw materialthe erosive wear resistance of stainless steel was improved with N-i based alloy coating onto the stainless steel by plasma cladding．The coating’s microstructure was studied and its microhardness was measured using an HVS1000micro-hardness tester．The erosive wear resistance of the coating in a slurry erosion tester was investigated．The results show that the mechanical properties of metal materials influenced their erosive wear resistance：the larger the hardness value of the material isthe better the anti erosive wear properties are．On the same experimental conditionthe erosive wear rates of the materials follow this rule：N-i based coating ＞0Cr13Ni5Mo ＞1Cr18Ni9Ti．The improvement in erosion resistance can be attributed to the solution strengthening of γ-Ni matrix and the presence of large amounts of borides and carbides which withstood the impingement of slurry erosion． KEY WORDS N-i based alloy coating；plasma cladding；microstructure；microhardness；slurry erosion （上接第974页） Characteristics and application of three-phase foam in spontaneous combustion of coal QIN BotaoWA NG Deming State Key Laboratory for Coal Resources and Mine SafetyChina University of Mining and TechnologyXuzhou221008China ABSTRACT The characteristics of three-phase foam in mine fire control were introducedits covering and inhibition were analyzedand experiments on extinguishing the top fire in a porous medium were carried out．The results show that three-phase foam can cover the whole goaf and prevent everywhere fire by pervasion and accumulation．According to the characteristics of goaf and three-phase foamtechnical parameterssuch as diffused distance of three-phase foamlength between working face and pipe bottom and durative time for spontaneous combustion of coalwere deduced．Based on themthree-phase foam was applied in the workface N2703of Daxing coal mine in Chinaand laying pipes in advance in goaf was carried out．The effect of application shows that three-phase foam can successfully prevent spontaneous combustion of coal in the working face． KEY WORDS three-phase foam；mine fire control；pervasion；embedded pipe ·1004· 北 京 科 技 大 学 学 报 第29卷