Enhancing oxidation resistance of silicon nitride using a Ca2+ stabilizer

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS Journal of The European Ceramic Society Pub Date : 2024-10-09 DOI:10.1016/j.jeurceramsoc.2024.116977

Prapassorn Numkiatsakul , Tonghun Lee , Kenneth S. Kim , Waltraud M. Kriven

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Abstract

Silicon nitrides are widely used in ceramic heaters for combustion engines due to their high strength and wear resistance. However, their poor oxidation resistance at elevated temperatures limits their reliability. Oxidation products, such as silica and intermediate compounds from sintering additives, often suffer from microcracks due to phase transformation and volume expansion mismatch during thermo-mechanical cycles. Use of cation dopants to chemically stabilize the transformation of the oxidation front is proposed. This study investigated the effect of Ca²⁺ treatment on Si₃N₄ with MgO and Y₂O₃ sintering aids. The Si₃N₄ samples were coated with CaO and the phase composition, microstructure, and chemical distribution of the oxidation products were analyzed using XRD, SEM, TEM, STEM, and EDS. The oxidation coupon tests revealed that the CaO coating effectively protected Si₃N₄ from oxidation at 1300 ºC for 40 h. Moreover, the microstructural analysis showed that CaO coating created more favorable microstructures which reduced oxidation reactions.

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使用 Ca2+ 稳定剂增强氮化硅的抗氧化性

氮化硅具有高强度和耐磨性，因此被广泛应用于内燃机的陶瓷加热器中。然而，氮化硅在高温下的抗氧化性较差，限制了其可靠性。氧化产物（如二氧化硅和烧结添加剂产生的中间化合物）在热机械循环过程中往往会因相变和体积膨胀不匹配而产生微裂纹。有人建议使用阳离子掺杂剂来化学稳定氧化前沿的转变。本研究调查了用氧化镁和氧化亚铜烧结辅助剂对 Si3N4 进行 Ca2+ 处理的效果。在 Si3N4 样品上涂覆 CaO，并使用 XRD、SEM、TEM、STEM 和 EDS 分析了氧化产物的相组成、微观结构和化学分布。氧化试样测试表明，CaO 涂层能有效保护 Si3N4 在 1300 ºC 下氧化 40 小时。此外，微观结构分析表明，CaO 涂层产生了更有利的微观结构，从而减少了氧化反应。

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来源期刊

Journal of The European Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

10.70

自引率

12.30%

发文量

863

审稿时长

35 days

期刊介绍： The Journal of the European Ceramic Society publishes the results of original research and reviews relating to ceramic materials. Papers of either an experimental or theoretical character will be welcomed on a fully international basis. The emphasis is on novel generic science concerning the relationships between processing, microstructure and properties of polycrystalline ceramics consolidated at high temperature. Papers may relate to any of the conventional categories of ceramic: structural, functional, traditional or composite. The central objective is to sustain a high standard of research quality by means of appropriate reviewing procedures.