Al(OH)3 对通过激光粉末床熔融结合真空渗透制备的硅基陶瓷芯性能的影响

IF 10.3 1区 工程技术 Q1 ENGINEERING, MANUFACTURING
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引用次数: 0

摘要

硅基陶瓷芯具有热膨胀系数低、烧结温度低、酸碱浸出能力强等特点,是生产空心叶片的重要材料。然而,它们的机械性能并不理想,而且在加工过程中存在各种难题。在本研究中,采用真空渗透(VI)和激光粉末床熔融(LPBF)技术相结合的方法制备了硅基陶瓷芯。Al(OH)3 被用作矿化剂,以增强烧结后的机械性能并提高真空渗透工艺的效率,从而提高硅基陶瓷芯的整体性能。在 1225°C 的烧结过程中,VI 工艺促进了纳米二氧化硅向样品的渗透,增加了样品的密度,并促进了钙钛矿的形成。此外,Al(OH)3 粉末在烧结过程中热解成 Al2O3,减少了微裂纹,抑制了嵴钙石的过度转化,改善了 VI 过程,从而提高了室温抗折强度。通过优化 Al(OH)3 含量和 VI 过程,硅基陶瓷芯的微观结构和性能得到了显著改善。经过三轮真空浸润和添加 4 wt% 的 Al(OH)3 后,样品的高温蠕变为 0.17 mm,室温抗折强度为 15.23 MPa,高温抗折强度为 23.55 MPa。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of Al(OH)3 on the properties of silica-based ceramic cores prepared by laser powder bed fusion combined with vacuum infiltration
Silica-based ceramic cores, with low coefficients of thermal expansion, low sintering temperatures, and excellent acid and alkali leaching capabilities, are essential materials for the production of hollow blades. However, their mechanical properties are suboptimal, and they present various processing challenges. In this study, silica-based ceramic cores were prepared using a combination of vacuum infiltration (VI) and laser powder bed fusion (LPBF) techniques. Al(OH)3 was employed as a mineralizer to enhance the post-sintering mechanical properties and improve the efficiency of the vacuum infiltration process, thereby enhancing the overall performance of the silica-based ceramic cores. The VI process facilitated the penetration of nano-SiO2 into the samples, increasing their density and promoting the formation of cristobalite during sintering at 1225°C. Additionally, the Al(OH)3 powder, through pyrolysis into Al2O3 during sintering, reduced microcracks, inhibited excessive cristobalite transformation, and improved the VI process, resulting in enhanced room-temperature flexural strength. By optimizing the Al(OH)3 content and the VI process, significant improvements in the microstructure and properties of the silica-based ceramic cores were achieved. After three rounds of vacuum infiltration and the addition of 4 wt% Al(OH)3, the samples exhibited a high-temperature creep of 0.17 mm, with flexural strengths of 15.23 MPa at room temperature and 23.55 MPa at high temperature.
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来源期刊
Additive manufacturing
Additive manufacturing Materials Science-General Materials Science
CiteScore
19.80
自引率
12.70%
发文量
648
审稿时长
35 days
期刊介绍: Additive Manufacturing stands as a peer-reviewed journal dedicated to delivering high-quality research papers and reviews in the field of additive manufacturing, serving both academia and industry leaders. The journal's objective is to recognize the innovative essence of additive manufacturing and its diverse applications, providing a comprehensive overview of current developments and future prospects. The transformative potential of additive manufacturing technologies in product design and manufacturing is poised to disrupt traditional approaches. In response to this paradigm shift, a distinctive and comprehensive publication outlet was essential. Additive Manufacturing fulfills this need, offering a platform for engineers, materials scientists, and practitioners across academia and various industries to document and share innovations in these evolving technologies.
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