Effect of pre-added cristobalite content on high temperature creep properties of silicon-based ceramic core
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摘要: 将方石英作为第二相、锆英砂作为矿化剂加入到SiO2基陶瓷型芯基体材料中,采用热压注法制备陶瓷型芯。研究预加方石英含量对SiO2基陶瓷型芯性能的影响,分析在1550℃下预加方石英含量对SiO2基陶瓷型芯高温蠕变性能的影响机制。结果表明,随着预加方石英含量的增加,SiO2基陶瓷型芯抗弯强度和高温挠度逐渐减小,型芯的气孔率逐渐增加。当预加方石英含量为10wt%时,石英玻璃析晶速率最快,方石英开始相连构成耐高温的方石英骨架,陶瓷型芯抵抗高温变形的能力显著提高,陶瓷型芯的综合性能最佳,其抗弯强度、高温挠度和气孔率分别为5.13 MPa、1.18 mm和40.55%。Abstract: Cristobalite was added as the second phase and zircon sand as the mineralizer to the silicon-based ceramic core matrix material, and the ceramic core sample was prepared by hot press injection method. The effect of pre-added cristobalite content on the performance of silicon-based ceramic cores was studied, and the mechanism of the influence of pre-added cristobalite content on the high temperature creep of silicon-based ceramic cores at 1550℃ was analyzed. The results show that as the content of pre-added cristobalite increases, the bending strength and high-temperature deflection of the silicon-based ceramic core gradually decrease, and the porosity of the core gradually increases. When the pre-added cristobalite content is 10wt%, the crystallization rate of quartz glass is the fastest, cristobalite begins to form a high-temperature-resistant cristobalite skeleton, the core’s ability to resist high-temperature deformation is significantly improved, the bending strength is 5.13 MPa, the high temperature deflection is 1.18 mm, the porosity is 40.55%, the comprehensive performance of the ceramic core is the best.
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Key words:
- ceramic core /
- cristobalite /
- high temperature deflection /
- high temperature creep /
- porosity
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表 1 陶瓷型芯原料配比
Table 1. Raw material ratios of ceramic core
wt% Numbering Quartz glass powder Zircon sand Cristobalite A0 85 15 0 A1 80 15 5 A2 75 15 10 A3 70 15 15 A4 65 15 20 A5 60 15 25 -
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