基于SLS的锆砂砂型与钛合金铸件界面反应研究

Interfacial Reaction of Zirconium Sand Mold with Titanium Alloy Castings Based on SLS Method

以锆砂为原砂材料,Y_2O_3、酚醛树脂为填充材料和粘结剂,采用热法制备覆膜锆砂,选区激光烧结(SLS)快速成形工艺制备锆砂铸型并浇注了钛合金铸件,研究了钛与铸型之间的界面反应。结果表明,采用SLS覆膜锆砂快速制备铸型,选用Y_2O_3制备涂层浇注纯钛可以铸造出轮廓清晰、表面光洁的钛铸件,且界面反应层仅约为3μm;铸件表面氧化层产物为TinO_(2n-1)和TiO_2;O扩散富集固溶层厚度约为1μm,该层生成物为TiO_2。

Through selecting zircon sand as raw materials of sand,yttrium oxide（Y2O3）and phenolic resin as filler and binder,coated zircon sand was prepared by thermal method,and zirconium sand mold was prepared by selective laser sintering（SLS）to pour pure titanium castings by rapid prototyping process.The interfacial reaction between titanium alloy and mould was analyzed.The results show that the titanium castings with clear profile and clean surface and interface reaction layer only about 3μm can be fabricated successfully by SLS coated zircon sand casting with Y2O3 coating.Oxidation products in casting surface are composed of TinO2n-1 and TiO2.The thickness of O diffusion enrichment solution layer is about 1μm,which is TiO2.