Development of metal powder composite materials by fusion processing technologies

研究的目的是开发具有新型功能性能的金属粉末复合材料。通过选择金属粉末和硬质合金粉末的组合和配比，设计了合适的组合物，制备了合适的颗粒尺寸，获得了耐腐蚀、耐热、耐磨、高温抗氧化的新型功能性能。采用等离子体转移法、等离子体喷涂激光熔覆法等熔融加工技术，利用各种金属粉末和碳化物粉末在钢基体上制备复合材料。作为基体的结构钢通过上述方法覆盖了一层复合合金，使其表面具有新的功能性能。这种材料的杂交将有利于改善许多工业领域遇到的问题。生产的复合材料如下：(1) Al-Zn-Si体系复合材料选择不同配比的Al、Zn和Si金属粉末，在有机溶液膏体中混合。将膏体涂于HT50钢板上，低温熔化，在钢板基材表面形成复合合金层。50%Al +、30-40%Zn、10-20%Si的复合合金层表面具有良好的耐海水腐蚀性和低温区耐热性。(2)铬系复合材料采用等离子体转移电弧法在低碳钢和SUS304L钢板上沉积了纯铬金属粉末。SUS304L钢板表面的复合合金层由Fe-Cr-Ni固溶体中未熔合的Cr颗粒组成，具有良好的耐腐蚀、耐酸性和耐磨性。(3)碳化物分散复合材料采用等离子体转移电弧法将TiC、NbC等6种碳化物粉末与Co基合金粉末等4种合金粉末一起沉积在低碳钢板上。复合合金层也是由基体中未熔合的碳化物颗粒组成。未熔合的碳化物颗粒比基体具有良好的耐磨性。(4) NiCrAlY复合材料采用等离子转移电弧法、等离子喷涂、激光熔覆等工艺在镍基高温合金板上沉积NiCrAlY粉末。激光熔覆合金层具有较好的高温抗氧化性能。少

The purpose of the study is to develop the metal powder composite materials having a new functional properties. The combination and mixing ratio of metal powders and carbide powders were selected, designed a compositions and prepared a suitable size of particle to get the new functional properties, which are a corrosion resistance, a heat resistance, a abrasion resistance, a oxidation resistance at high temperature.The composite materials were produced on some structural steel substrate using various metal powders and carbide powders by fusion processing technologies such as plasma transfer are method, plasma spraying laser cladding process and others. As the structural steel using as substrate was overlaid the layer of composite alloy by above method, it's surface has new functional property. This hybridization of materials will be benefit of improvement for problems encountered in many industrial areas.The composite materials produced are as follows. (1) Al-Zn-Si sytem composite mate … More rials Several mixing ratio of Al, Zn and Si metal powders were selected and mixed in a organic solution paste. The paste was applied on HT50 steel plate and melted at low temperature to make a composite alloy layer on the surface of steel plate substrate. The surface of the composite alloy layer for 50%Al more, 30-40%Zn and 10-20%Si has good corrosion resistance for sea water and heat resistance at low temperature region. (2) Cr sytem composite materials Pure Cr metal powder was deposited on mild steel and SUS304L steel plate by using plasma transfer arc method. The surface of the composite alloy layer on SUS304L steel plate consisted of the Cr non-fused particles in the Fe-Cr-Ni solid solution and has good corrosion resistance folacid and abrasion resistance (3) Carbide dispersed composite materials 6 types of carbide powders such as TiC, NbC were deposited together with 4 types of alloy powders such as Co base alloy powder on mild steel plate by using plasma transfer arc method. The composite alloy layer also, consisted of the carbide non-fused particles in the matrix. The carbide non-fused particles have good abrasion resistance than matrix. (4) NiCrAlY composite materials NiCrAlY powder was deposited on Ni base super alloy plate by plasma transfer arc method, plasma spraying, laser cladding process. The alloy layer by laser cladding process has good oxidation resistance at high temperature than other process. Less