基于SLS的双组分黏结剂钛合金砂型制备工艺研究  

Preparation Process of Bi-component Binder Titanium Alloy Sand Mold Based on SLS

作　　者：李政勋 徐志锋 张守银 李珅 肖强伟 黎阳 LI Zhengxun;XU Zhifeng;ZHANG Shouyin;LI Shen;XIAO Qiangwei;LI Yang(Laboratory of National Defense Key Discipline of Light Alloy Processing Science and Technology,Nanchang Hangkong University,Nanchang 330063;Beijing Institute of Aeronautical Materials Co.,Ltd.,Beijing 100089;AECC Beijing Institute of Aeronautical Materials,Beijing 100095)

机构地区：[1]南昌航空大学轻合金加工科学与技术国防重点学科实验室,南昌330063 [2]北京航空材料研究院股份有限公司,北京100089 [3]中国航发北京航空材料研究院,北京100095

出　　处：《特种铸造及有色合金》2025年第2期228-234,共7页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(52165018)。

摘　　要：结合钛合金砂型铸造和选区激光烧结(Selective Laser Sintering,SLS)技术,选用覆膜熔融陶瓷砂为原材料,研究了磷酸盐粉末添加量对SLS双组分覆膜熔融陶瓷砂型初强度、固化强度和高温强度的影响,探讨了其作用机制,并进行了真空浇注TC4试验。结果表明,选用优化后的2%酚醛树脂熔融陶瓷砂+7%磷酸盐粉末的双组分黏结剂覆膜熔融陶瓷砂成形,初强度为0.48 MPa,低温焙烧后,固化强度为0.73 MPa;涂覆自制氧化钇涂层后高温强度为2.64 MPa,发气量仅为4.16 mL/g;真空浇注的钛合金铸件粗糙度为4.70~8.55μm,无明显铸造缺陷,平均显微硬度(HV)为371。EDS元素线扫描显示,钛合金铸件平均界面反应层层厚小于30μm。Taking coated fused ceramic sand as raw material,influence of phosphate powder addition on the initial strength,curing strength and high-temperature strength of SLS bi-component coated fused ceramic sand was investi⁃gated.The action mechanism was explored,and vacuum casting TC4 test was carried out.The results indicate that the initial strength of optimized bi-component coated fused ceramic sand molding with 2%phenolic resin fused ceramic sand+7%phosphate powder is 0.48 MPa,and the cured strength is 0.73 MPa after low-temperature baking.The high-temperature strength of homemade yttrium oxide coating for baking is 2.64 MPa,and the gassing amount is only 4.16 mL/g.The roughness of titanium alloy castings by vacuum casting is 4.70~8.55μm without obvious casting defects,and the average microhardness is 371 HV.EDS linear scanning reveals that the average thickness of interfacial reaction layer in titanium alloy castings is less than 30μm.

关 键 词：钛合金 砂型铸造 选区激光烧结 双组分黏结剂覆膜熔融陶瓷砂 高温焙烧强度 

分 类 号：TG146.23[一般工业技术—材料科学与工程]