粉末冶金材料科学与工程
粉末冶金材料科學與工程
분말야금재료과학여공정
POWDER METALLURGY MATERIALS SCIENCE AND ENGINEERING
2015年
2期
207-212
,共6页
热化学镀%流延法%W-Cu合金%板材%熔渗烧结
熱化學鍍%流延法%W-Cu閤金%闆材%鎔滲燒結
열화학도%류연법%W-Cu합금%판재%용삼소결
thermal chemical plating%tape-casting%W-Cu alloy%sheet%infiltration sintering
采用热化学镀技术制备的铜含量为11%(质量分数)、平均粒度为5~10μm的铜包钨复合粉末为原料，经过胶体的流延成形、500℃脱胶、1200℃预烧、600 MPa预压和1300℃熔渗烧结，制备出厚度为0.2 mm、相对密度达98.8%的WCu20合金薄板；其组织呈现Cu相均匀填充在W颗粒周围的网络状分布，电导率达到36%IACS、热导率达到210 W/(m·K)、硬度达到280 HV，均高于相应的国家标准。WCu20合金板材的断裂方式由铜相的韧性断裂和钨相的穿晶断裂组成，包覆铜有利于合金韧性的提高。
採用熱化學鍍技術製備的銅含量為11%(質量分數)、平均粒度為5~10μm的銅包鎢複閤粉末為原料，經過膠體的流延成形、500℃脫膠、1200℃預燒、600 MPa預壓和1300℃鎔滲燒結，製備齣厚度為0.2 mm、相對密度達98.8%的WCu20閤金薄闆；其組織呈現Cu相均勻填充在W顆粒週圍的網絡狀分佈，電導率達到36%IACS、熱導率達到210 W/(m·K)、硬度達到280 HV，均高于相應的國傢標準。WCu20閤金闆材的斷裂方式由銅相的韌性斷裂和鎢相的穿晶斷裂組成，包覆銅有利于閤金韌性的提高。
채용열화학도기술제비적동함량위11%(질량분수)、평균립도위5~10μm적동포오복합분말위원료，경과효체적류연성형、500℃탈효、1200℃예소、600 MPa예압화1300℃용삼소결，제비출후도위0.2 mm、상대밀도체98.8%적WCu20합금박판；기조직정현Cu상균균전충재W과립주위적망락상분포，전도솔체도36%IACS、열도솔체도210 W/(m·K)、경도체도280 HV，균고우상응적국가표준。WCu20합금판재적단렬방식유동상적인성단렬화오상적천정단렬조성，포복동유리우합금인성적제고。
Copper-coated tungsten composite powders, with size of 5~10μm and copper content of 11% (mass fraction), were prepared by thermal chemical plating technology and used as raw materials. The WCu20 alloy sheet was fabricated by tape-casting with slurry of composite powders, and binder removing at 500℃, re-sintering at 1 200℃, pre-pressing at 600 MPa, and infiltration sintering at 1 300℃. The thickness of W-Cu sheet is 0.2 mm and the relative density is 98.8%. The structure presents network-like distribution that tungsten particles are surrounded closely by copper phase. The electrical and thermal conductivity are 36%IACS and 210 W/(m·K) respectively, the hardness is 280 HV, which are higher than the corresponding national standards values. The fracture mode of the alloy sheet are ductile fracture of copper binding phase and trans-granular fracture of tungsten phase. Coated copper is beneficial to the improvement of the ductile of the alloy.
