单粒度级配氧化硅基型芯高温尺寸稳定性研究  

Study on high temperature dimensional stability of silica-based ceramic cores with single particle size grading

作　　者：林新刚 潘智平[2,3] 崔树森 LIN Xingang;PAN Zhiping;CUI Shusen(Qingdao Gangyan Dekai Precision Casting co.,Ltd,Qingdao 266735,China;State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an 710072,China;Shenzhen Wedge Aviation Technology co.,Ltd,Shenzhen 518045,China;Dekai Intelligent Casting co.,Ltd,Zhuozhou 072750,China)

机构地区：[1]青岛钢研德凯精铸有限公司,山东青岛266735 [2]西北工业大学凝固技术国家重点实验室,陕西西安710072 [3]深圳市万泽航空科技有限责任公司,广东深圳518045 [4]河北钢研德凯科技有限公司,河北涿州072750

出　　处：《粉末冶金工业》2023年第2期78-83,共6页Powder Metallurgy Industry

摘　　要：为提高硅基型芯原料质量控制稳定性,实验以单粒度级配熔融石英粉为基体材料、硅酸锆为矿化剂、通过掺杂不同比例氧化铝粉和调整烧结温度,制备了具有良好的高温抗弯强度和抗蠕变性能的硅基型芯,探讨了氧化铝掺杂和烧结温度对硅基型芯高温尺寸稳定性(热膨胀行为和抗蠕变性能)的影响规律。研究结果表明,掺杂氧化铝和提高烧结温度有利于方石英析晶,促进硅基型芯烧结;烧结期间析出的方石英作为二次加热时的形核质点,加快熔融石英反玻璃化速率,显著改善硅基型芯的抗蠕变性能,但轻微恶化高温抗弯强度。当氧化铝掺杂量从0增加至0.3%,型芯1550℃/30 min热形变量由3.86 mm降低至0.54 mm,而高温强度由27.86 MPa降低至21.79 MPa;当烧结温度由1180℃升高至1240℃,型芯热形变量由3.86 mm降低至0.47 mm,高温强度由27.86 MPa降低至19.67 MPa。Based on the practical demand of raw materials quality control stability,with single particle size graded fused silica powder as the matrix material and zircon as the mineralizer,silica-based ceramic cores were prepared.Excellent high-temperature flexural strength and creep resistance was obtained through doping alumina powders and adjusting the sintering temperature.The effects of alumina and sintering temperature on the high temperature dimensional stability of silica-based ceramic cores were discussed.The results show that the increasing of the alu‐mina amount and the sintering temperature are beneficial to the crystallization of cristobalite and the sintering level of silica-based cores,leading to significantly improves of the creep resistance of silica-based cores,but slightly deteriorates the high-temperature flexural strength.As the alumina doping ratio increases from 0 to 0.3%,the 1550℃/30 min thermal deformation of the ceramic cores is significantly reduced from 3.86 mm to 0.54 mm,while the flexural strength at 1550℃ is decreased from 27.86 MPa to 21.79 MPa.With the increasing of the sintering temperature from 1180℃ to 1240℃,the thermal deformation is reduced from 3.86 mm to 0.47 mm,while the flexural strength at 1550℃ is deteriorated from 27.86 MPa to 19.67 MPa.

关 键 词：熔融石英 单粒度级配 热膨胀行为 抗蠕变性能 氧化硅基型芯 涡轮叶片铸件 

分 类 号：V263[航空宇航科学与技术—航空宇航制造工程] TG22[金属学及工艺—铸造]