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1、Feb.2012铸造Vol.61No.2FOUNDRY·165·"!!!!!"!!"复合材料!!!!!"颗粒增强高铬铸铁基复合材料的制备、组织与性能1,31,2131郑开宏,赵散梅,王娟,陈亮,李林(1.广州有色金属研究院金属加工与成型技术研究所,广东广州510650;2.中南大学材料科学与工程学院,湖南长沙410083;3.西安交通大学金属材料强度国家重点实验室,陕西西安710049)摘要:将粒径为1~3mm的ZTA(ZrO2增韧Al2O)陶瓷颗粒与自制粘结剂均匀混合后填充到具有蜂窝状内腔的模具中
2、3固化后获得蜂窝状多孔陶瓷预制体,浇注高铬铸铁金属液铸渗陶瓷预制体成功制备出ZTA陶瓷颗粒增强高铬铸铁基耐磨复合材料,并考察了复合材料的三体磨料磨损性能。结果表明:复合材料中陶瓷颗粒的体积分数为48%~58%;陶瓷颗粒与基体界面致密,无缩孔、裂纹等缺陷;经热处理后复合材料的耐三体磨料磨损性能是工程中常用的Cr20高铬铸铁的5.9倍。关键词:复合材料;ZTA;高铬铸铁;三体磨损中图分类号:TB331文献标识码:A文章编号:1001-4977(2012)02-0165-04Fabrication,Mic
3、rostructureandPropertiesofHighChromiumCastIronMatrixCompositesReinforcedwithCeramicParticles1,31,2131ZHENGKai-hong,ZHAOSan-mei,WANGJuan,CHENLiang,LILin(1.InstituteofMaterialsProcessingandForming,GuangzhouResearchInstituteofNon-FerrousMetals,Guangzhou51
4、0650,Guangdong,China;2.SchoolofMaterialsScienceandEngineering,CentralSouthUniversity,Changsha410083,Hunan,China;3.StateKeyforMechanicalBehaviorofMaterials,Xi'anJiaotongUniversity,Xi'an710049,Shaanxi,China)Abstract:Theporousceramicpreformswerefabricated
5、byfirstlymixingtheZTA(ZrO2toughenedAl2O)3ceramicparticlesof1to3mmindiameterandself-madebinder,thenputthemixtureintoadiewithhoneycombingcavity,andfinallyaporousceramicpreformscanbeobtainedaftersolidification.ZTAparticlereinforcedhighchromiumcastironmatr
6、ixcompositeshavebeenpreparedsuccessfullybypouringtheliquidmetaltotheporousceramicpreforms.Thethree-bodyabrasiveresistanceofthecompositehasbeeninvestigated.Theresultsshowthatthevolumefractionofceramicparticleinthecompositeis48%to58%,andtheinterfacebetwe
7、enceramicparticleandmatrixiscompact,therearenodefectssuchasporosity,crackandsoon.Thethree-bodyabrasiveresistanceofthecompositeafterheattreatmentis5.9timeshigherthanthatofCr20castiron.Keywords:composites;ZTA;highchromiumcastiron;three-bodyabrasiveresist
8、ance高铬铸铁具有优异的耐磨性能,在水泥、电力、矿方法与负压铸渗技术,获得氧化铝颗粒体积分数在山等行业广泛应用于磨辊、衬板、板锤等耐磨部件,但18%~52%的氧化铝颗粒/耐热钢基复合材料,其耐磨性[3]在高硬质磨料、高冲击等恶劣的三体磨损工矿下,导致最高可达到耐热钢的3.27倍。目前多数研究是采用粒耐磨件迅速失效,其仍不能满足用户的要求。祁小群等径小于1mm的陶瓷颗粒作为增强相,且复合层厚度较人采用增强相为600~850μm的WC颗粒制备颗粒增强高小,而采用较大粒径