加速老化条件下碳化硼粉末稳定性的评价

IF 2.9 Q1 MATERIALS SCIENCE, CERAMICS

Open Ceramics Pub Date : 2025-02-17 DOI:10.1016/j.oceram.2025.100755

Amruth Kaitheri , Johannes Ofstad , Elvia Anabela Chavez Panduro , Martin Oppegård , Sanosh Kunjalukkal Padmanabhan , Sudipto Pal , Antonio Alessandro Licciulli , Vidar Johannesen , Trygve Eidet , Kjell Wiik , Mari-Ann Einarsrud

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引用次数: 0

摘要

碳化硼（B4C）是一种坚硬耐用的陶瓷，用于航空航天、核反应堆、弹道防护等领域。采用可控气氛下400℃热处理的加速时效方法，研究了B4C粉末在环境条件下的稳定性。B4C的转化率依次为：氩气（无反应）、加湿氩气（~ 4%）、合成空气（~ 13%）、加湿合成空气（~ 19%）。在加湿气氛下，反应产物为硼酸。在加湿的合成空气中，高转化率表明湿度加速了氧化，并提出了一种反应机理来解释氧化速率的提高。预计观察到的氧化反应不仅限于400°C，而且也会发生在环境温度下。这与在环境大气中储存期间B4C质量下降的观察结果一致。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Evaluation of Boron Carbide powder stability under accelerated aging

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Evaluation of Boron Carbide powder stability under accelerated aging

Boron carbide (B₄C) is a hard and durable ceramic used in aerospace, nuclear reactors, ballistic protection, etc. The stability of B₄C powders at ambient conditions has been investigated using accelerated ageing by heat treatment at 400 °C in controlled atmospheres. The degree of conversion of B₄C increased in the following order: Argon (no reaction), humidified argon (∼4 %), synthetic air (∼13 %) and humidified synthetic air (∼19 %). In humidified atmosphere, the reaction product was boric acid due to cooling in the presence of humidity. The high conversion in humidified synthetic air suggests that humidity accelerates the oxidation, and a reaction mechanism is proposed to explain the enhanced rate of oxidation. It is anticipated that the observed oxidation reactions are not limited to 400 °C but will also occur at ambient temperatures. This agrees with observations of reduced quality of the B₄C during storage in ambient atmosphere.

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