Effect of SiC on the Oxidation Resistance of Graphite Crucible for Aluminum Melting

Zhang Junzhan; Zhang Ying; Wang Hao; Meng Mei

doi:10.15980/j.tzzz.2012.08.038

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Effect of SiC on the Oxidation Resistance of Graphite Crucible for Aluminum Melting
Vol. 32, Issue 8, Pages: 707-709(2012)
Published： 2012 ，
DOI： 10.15980/j.tzzz.2012.08.038

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[1]张军战,张颖,王浩,孟梅.SiC对熔铝石墨坩埚抗氧化性能的影响[J].特种铸造及有色合金,2012,32(08):707-709.

Zhang Junzhan, Zhang Ying, Wang Hao, et al. Effect of SiC on the Oxidation Resistance of Graphite Crucible for Aluminum Melting. [J]. Special Casting & Nonferrous Alloys 32(8):707-709(2012)
[1]张军战,张颖,王浩,孟梅.SiC对熔铝石墨坩埚抗氧化性能的影响[J].特种铸造及有色合金,2012,32(08):707-709. DOI： 10.15980/j.tzzz.2012.08.038.

Zhang Junzhan, Zhang Ying, Wang Hao, et al. Effect of SiC on the Oxidation Resistance of Graphite Crucible for Aluminum Melting. [J]. Special Casting & Nonferrous Alloys 32(8):707-709(2012) DOI： 10.15980/j.tzzz.2012.08.038.

摘要

采用鳞片状石墨、SiC、硅粉和高岭土等主要原料制备含SiC的熔铝石墨坩埚

试样分别在1050、1100、1150和1200℃保温3h烧成

随后将试样分别加热到700、800和900℃保温6h进行氧化试验。研究了SiC的加入量、烧成温度、氧化温度和时间对试样抗氧化性能的影响。结果表明

随着SiC含量的增加

坩埚的抗氧化性能得到明显的改善

这种作用在较高温度下尤为显著;SiC含量较多的试样

失重曲线平缓

失重率较小;试样的最佳烧成温度应控制在1100～1150℃之间;随着氧化温度的升高和氧化时间的延长

试样的失重率增加

尤其是在700～800℃氧化温度下。

Abstract

Graphite crucible containing SiC for aluminum melting was prepared by using flake graphite

silicon carbide

silicon powder and kaolin as raw materials.The specimens were sintered at 1 050 ℃

1 100 ℃

1 150 ℃ and 1 200 ℃ for 3 h

respectively.Then the oxidation resistance test was conducted at 700 ℃

800 ℃ and 900 ℃ for 6 h

respectively.The effects of SiC content

firing temperature

oxidation temperature and time on the oxidation resistance were investigated.The results show that the oxidation resistance is significantly improved with the increasing of the content of SiC

particularly in the higher oxidation temperature.The weight loss curve changes gently and the weight loss rate is lower for the specimen with the higher SiC content.The optimum firing temperature is 1 100～1 150 ℃.The weight loss rate increases with the increase of oxidation temperature and time

particularly in the temperature of 700～800 ℃.