摘要
模拟不烧铝碳滑板配方,以板状刚玉、金属铝粉、鳞片石墨为主要原料,热固性酚醛树脂为结合剂,经混练、成型、烘干、切割、磨制成规格为25mm×25mm×130mm的试样,检测了200℃×24h烘干、500~1100℃×3h埋碳热处理后试样的高温抗折强度和应力-应变关系。借助XRD、SEM和EDS对试样进行物相组成和显微结构分析,以期对高性能滑板的开发、研制和改进提供理论依据和参考。实验结果表明:金属铝粉的熔化(熔点660℃)导致金属铝结合不烧铝碳滑板的高温抗折强度和弹性模量在700℃左右出现最低值;之后随温度的升高,金属铝发生反应生成六方状氧化铝和纤维状碳化铝,滑板的显微结构和物相组成发生明显变化,高温抗折强度和弹性模量急剧增大,1100℃时达到所测试温度范围内的最大值,并有继续增大的趋势。
Based on the formula of aluminum bonded unburned Al203-C slide gate plates, mixtures of corundum,metal aluminum,flake graphite and thermosetting phenolic resin binder were prepared, and then formed,dried,cut and finally grinded into 25 mm × 25 mm × 130 mm samples. Then the middletemperature properties of specimen after dried at 200 ℃ for 24 h and heated from 500 ℃ to 1100 ℃ buried in carbon for 3 h were determined, such as stress-strain relations, high-temperature modulus of rupture (HMOR) etc. Furthermore,the microstructure and mineral phase of the specimen were studied by scanning electron microscope (SEM) ,energy dispersive X-ray spectroscope (EDS) and X-ray Diffraction (XRD), with a view to providing some theoretical basis and reference for the development and improvement of high-performance slide gate plates. The results showed that: The hot modulus of rupture (HMOR) and modulus of elasticity of the unburned AI203-Al-C slide gate plates were both the lowest at 700 ℃ caused by the melting of the aluminum;then they sharply increased going with the temperature rising and went to the highest at 1100 ℃ during the test temperature range,because the aluminum acted and formed hex alumina and fibrous aluminum carbide which led to tremendous changes of their microstructures and mineral phases.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2008年第5期1032-1035,1039,共5页
Bulletin of the Chinese Ceramic Society
关键词
金属铝
高温抗折强度
弹性模量
显微结构
物相组成
aluminum
hot modulus of rupture ( HMOR )
modulus of elasticity
microstructure
mineral phase composition