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Experimental study on mechanical properties of silica-based ceramic core for directional solidification of single crystal superalloy

机译：二氧化硅基陶瓷芯力学性能试验研究单晶超合金定向凝固

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摘要

The effects of holding time in Bridgman furnace on mechanical properties of injection molded silica-based ceramic cores for directional solidification of SX superalloy have been investigated. The cylindrical samples (S0) were sintered at 1000 degrees C for 60 min, and some of the sintered samples (S1, S2, S3) were treated by heat treatment at 1500 degrees C to simulate the directional solidification process. Isothermal uniaxial compression tests of ceramic core samples were conducted on a Gleeble-1500D mechanical simulator. Weibull approach was used to describe the strength distribution of silica-based ceramic cores. As a result, the mean compressive strength of the sample (S0) is 40.43 MPa. The mean compressive strengths of the samples (S1, S2, S3) with heat treatment at 1500 degrees C are 54.34 MPa, 53.60 MPa and 53.81 MPa, respectively, which are significantly larger than that of S0. The mean elastic moduli of the samples (S1, S2, S3) with heat treatment at 1500 degrees C are 2726.39 MPa, 2855.91 MPa and 2797.14 MPa, respectively, which is significantly higher than that of S0. The refractory particle evolution of the ceramic core during the directional solidification process is analyzed, and the microstructural investigations show that the crack propagation of ceramic core sintered at 1000 degrees C is mainly through the sintering necks between particles. However, the crack propagation of ceramic core holding at 1500 degrees C is extended through the entire large particles. The re-sintering process of ceramic core holding at 1500 degrees C compensates the negative effect of cracks due to the volume contraction during beta- to alpha-phase transformation and the rapid cooling process, and improves the ceramic core uniformity and mechanical properties.
机译：研究了在Bridgman炉中保持时间对注塑模二氧化硅基陶瓷芯的机械性能，用于SX超合金的定向凝固。圆柱形样品（S0）在1000℃下烧结60分钟，并通过1500℃的热处理处理一些烧结样品（S1，S2，S3）以模拟定向凝固过程。在GLEEBLE-1500D机械模拟器上进行了陶瓷芯样品的等温单轴压缩试验。威布尔方法用于描述二氧化硅型陶瓷芯的强度分布。结果，样品的平均抗压强度（S0）是40.43MPa。在1500摄氏度下热处理的样品（S1，S2，S3）的平均压缩强度分别为54.34MPa，53.60mPa和53.81MPa，其显着大于S0。在1500摄氏度下热处理的样品（S1，S2，S3）的平均弹性模量分别为2726.39MPa，2855.91MPa和2797.14MPa，其显着高于S0。分析了定向凝固过程中陶瓷芯的耐火粒子演化，微观结构研究表明，在1000℃下烧结的陶瓷芯的裂纹繁殖主要是通过颗粒之间的烧结颈部。然而，陶瓷芯保持在1500℃下的裂纹传播通过整个大颗粒延伸。在1500摄氏度下保持陶瓷芯保持的重新烧结过程补偿裂缝引起的裂缝的负效应，并且在β-相相转化期间的体积收缩和快速冷却过程，并提高了陶瓷芯均匀性和机械性能。

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