Developmental Research of New-Ceramics and Metal Composite Wear Resistant Materials

本研究的目的是建立新型陶瓷与铁基合金的结合技术，并开发其复合材料的耐磨性能。结果表明：(1)采用含铬15%的Fe-C合金和Fe-Cr-C合金熔体铸造WC基陶瓷。而在27%Cr合金中，熔体表面形成<Cr_2> <O_3>膜，降低了结合条件。在金属陶瓷表面镀Ni-P合金，可以有效地改善高铬Fe-Cr-C合金熔体的润湿性。摘要由于TiC基金属陶瓷中含有Mo和Ni，使得TiC基金属陶瓷与Fe-C合金的结合条件较好。(2)采用高铬铸铁对WC基和TiC基陶瓷的骨架进行了渗渗处理，并成功地采用Fe-27%Cr-C合金对WC基和TiC基陶瓷进行了熔接，制备了复合材料。(3)采用等离子喷涂法制备了CrB陶瓷基涂层与钢的复合材料，并通过在两者之间形成合金相形成结合。热处理条件改变了合金相和镀层组织。(4) VC和<Cr_3> <C_2>陶瓷与Fe-Cr-Ni合金熔体的组合，以及NbC、WC和VC陶瓷与高含碳量Fe-Cr-C合金熔体的组合，有利于复合铸造工艺生产复合材料。几种精细陶瓷和Fe-27%Cr-3.6C合金材料的耐磨性是27%Cr共晶铸铁的4 ~ 5倍。

THE PURPOSE OF THIS STUDY WAS TO ESTABLISH THE TECHNIQUES OF BONDING THE NEW CERAMICS AND IRON BASE ALLOYS AND THEN TO DEVELOP THEIR COMPOSITE MATERIALS FOR ABRASION WEAR RESISTANCE. THE RESULTS CLARIFIED FROM THIS INVESTIGATION ARE AS FOLLOWS:(1) WC BASE CERMETS WERE CAST-BONDED BY THE MELTS OF Fe-C ALLOY AND Fe-Cr-C ALLOY CONTAINING UP TO 15%Cr. IN 27%Cr ALLOY, HOWEVER, THE BONDING CONDITION WAS LOWERED BECAUSE OF <Cr_2> <O_3> FILM FORMED ON THE SURFACE OF THE MELT. Ni-P ALLOY PLATING ON THE CERMET IMPROVED EFFECTIVELY THE WETTABILITY OF THE Fe-Cr-C ALLOY MELT WITH HIGHER CHROMIUM CONTENT. BONDING CONDITION OF TiC BASE CERMET AND Fe-C ALLOY WAS FAIRLY GOOD BECAUSE OF Mo AND Ni IN THE CERMET.(2) SKELTONS OF WC BASE AND TiC BASE CERMETS COULD BE INFILTRATED BY HIGH CHROMIUM CAST IRON AND FURTHERMORE THEY WERE SUCCESSFULLY CAST-BONDED BY Fe-27%Cr-C ALLOY TO MANUFACTURE THEIR COMPOSITE MATERIALS.(3) COMPOSITE MATERIALS OF CrB CERAMIC BASE COATING AND STEEL WERE MANUFACTURED BY THE PLASMA SPRAYING AND THEIR BONDING WAS CAUSED BY FORMING THE ALLOYED PHASE BETWEEN THEM. THE ALLOYED PHASE AND THE STRUCTURE OF COATING WERE CHANGED BY THE CONDITIONS OF HEAT TREATMENT.(4) THE COMBINATIONS OF VC AND <Cr_3> <C_2> CERAMICS AND Fe-Cr-Ni ALLOY MELT, AND THOSE OF NbC, WC AND VC CERAMICS AND Fe-Cr-C ALLOY MELT WITH HIGHER CARBON CONTENT WERE GOOD FOR THE PRODUCTION OF COMPOSITE MATERIALS BY COMPO-CASTING TECHNIQUE. THE WEAR RESISTANCE OF THE MATERIALS OF THE SEVERAL FINE CERAMICS AND Fe-27%Cr-3.6C ALLOY SHOWED FOUR TO FIVE TIMES AS LARGE AS THAT OF 27%Cr EUTECTIC CAST IRON.