陶瓷型芯颗粒级配控制及综合性能评定  

Evaluation on Comprehensive Performance of Ceramic Cores with Controlled Particle Grading

作　　者：牛书鑫 骆宇时 李鑫 杨永康 许西庆 NIU Shu-xin;LUO Yu-shi;LI Xin;YANG Yong-kang;XU Xi-qing(Science and Technology on Advanced High Temperature Structural Materials Laboratory,Beijing Institute of Aeronautical Materials,Beijing 100095,China;School of Materials Science and Engineering,Chang′an University,Xi’an 710061,Shannxi,China)

机构地区：[1]北京航空材料研究所先进高温结构材料重点实验室,北京100095 [2]长安大学材料科学与工程学院,陕西西安710061

出　　处：《铸造》2025年第3期350-356,共7页Foundry

基　　金：国家自然科学基金(52102062);陕西省重点研发计划(2024GX-YBXM-352)。

摘　　要：陶瓷型芯在空心涡轮叶片铸造中用于形成复杂内腔结构,其综合性能要求严苛。基于不同粒度的熔融石英粉进行颗粒级配,探究了陶瓷型芯物相组成与微观结构的演变规律,并进行了综合性能评定。适量的细粉可以填充在石英粗颗粒的骨架结构中,提高强度的同时保持低收缩。过多细粉会包围粗粉并破坏粗粉骨架结构,导致收缩率剧增,形成的致密结构不利于型芯的溶蚀性,且过多晶界会导致蠕变增加。基于雷达图确定,熔融石英细粉含量为30%的陶瓷型芯表现出优异的综合性能,浆料充型参数498 mm,型芯线收缩率为0.24%,表观气孔率为32.3%,表面粗糙度为1.2μm,高温蠕变为0.76 mm,常温强度为21.2 MPa,溶蚀率为0.65g/min。The investment casting of hollow turbine blades relies on the ceramic core to form the complex-shaped inner cavity,which imposes strict requirements on the comprehensive performance of the ceramic core.Fused silica powders with different particle sizes of were employed for particle gradation,the evolution of phase composition and microstructure of the ceramic cores were investigated,and the comprehensive performance was evaluated.Appropriate amounts of fine powder filled the skeleton structure of coarse particles,beneficial to mechanical property remaining a low shrinkage.Excessive fine powders would surround coarse powders and damage the skeleton structure of coarse powder,resulting in a sharp increase in shrinkage rate;the dense structure was not conducive to the leachability of ceramic cores,and excessive grain boundaries would lead to increased creep deformation.Based on the radar chart,the ceramic core with 30%fused silica fine powder showed excellent comprehensive performance,with slurry filling parameters of 498 mm,linear shrinkage of 0.24%,apparent porosity of 32.3%,surface roughness of 1.2μm,high temperature creep of 0.76 mm,room temperature and high temperature strength of 21.2 MPa and 22.4 MPa,and dissolution rate of 0.65 g/min.

关 键 词：陶瓷型芯 颗粒级配 骨架结构 雷达图 综合性能 

分 类 号：TG222[金属学及工艺—铸造]