钛精铸用hBN-Y2O3复合型壳制备工艺的研究.pdfVIP

维普资讯 学兔兔 Mar．2008 铸 造 VoI．57 No．3 F0UNDRY ·223· 钛精铸用hBN—Y203复合型壳制备工艺的研究 沈 彬，刘宏葆，孔 淳，毛协民，李重河，周 星，朱 明，蒋留全 (上海大学材料与_T-程学院，上海200072) 摘要：介绍一种新型钛合金精密铸造型壳——氮化硼基复合型壳的制备工艺。在此型壳中氮化硼作为面层涂料中的主 要耐火材料，钇熔胶作为粘结剂并适当加入少量氧化钇。该型壳充分利用六方氮化硼优异的化学惰性和氮化硼的密度 较小的特点，使在保证型壳有很好惰性又大幅降低型壳的制备成本。不仅介绍了不同氮化硼原料配制的涂料性质的差 异，还借助DSC和TG对氮化硼基复合型壳的烧结工艺进行较深入研究。 关键词：钛合金；氮化硼；精密铸造 中图分类号：TG146．2+3 文献标识码：A 文章编号：1001—4977(2008)03—0223—04 Preparation of hBN—Y203 Based Shell Mould Used for Investment Casting of Titanium Alloy SHEN Bin，LIU Hong—bao，KONG Bo，MAO Xie—min，Ll Chong—he，ZHOU Xing， ZHU Ming．JIANG Liu—quan (Department of Materials and Science Engineering，Shanghai University，Shanghai 200072，China) Abstract：A new kind of boron nitride based shelI mould used for investment casting of titanium alloy was presented．In the shelI mould，the face coatings are made of hexagonaI boron nitride(hBN) with smalI amounts of yttria(Y2O3)，and colloidal yttria as binder．Because of the IOW density and chemicaIinertia of hexagonaI boron nitride．the boron nitride based shelI mold possesses enough chemicalinertia to titanium alloys during casting and the cost of which iS much Iower than that common mould．The properties of the face coatings made of different grades of hexagonaI boron nitride，including the viscosity，density and plate retention were analyzed．Otherwise the sintering process of the boron nitride based shell mould was also investigated using DSC／TG． Key WOrds：titanium：boron nitride；investment casting 钛合金熔模精密铸造是钛合金成形的一重要方法。 多数金属无润湿性、且不发生反应，因而被广泛用在