CN105801143A - 一种高抗侵蚀性碳化硅砖及其制备方法 - Google Patents
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Abstract
本发明涉及一种高抗侵蚀性碳化硅砖及其制备方法。原料包括碳化硅砂为70~98%、无定形二氧化硅为0~8%、小于0.044mm的Al4SiC4为1~10%,金属硅粉0~8%,小于0.088mm的炭黑0~6%,外加2~4%的硅溶胶结合剂。制备方法包括称取原料、湿碾、成型、干燥和烧成,将成型的砖坯在110~160℃下干燥8~24h,在氮气气氛下加热至1250~1550℃,并在此温度下保温2~15h烧成,出窑。产品的主要成分为:SiC67~97%。本发明所得的碳化硅砖产品性能优良,强度高、热膨胀系数小、磨损性好、热震稳定性好、抗侵蚀性好。
Description
技术领域
本发明涉及一种耐火材料,特别是涉及一种高抗侵蚀性碳化硅砖及其制备方法。
背景技术
碳化硅材料有机械强度高、热导率高、抗热震性好、高温耐磨损性好、抗侵蚀性能优良特征,被广泛应用于钢铁、冶金、石化、电力、陶瓷等工业领域。
但是,碳化硅材料在使用过程中由于发生氧化,SiC发生氧化分解,会造成脱碳现象,在脱碳层中,组织结构疏松,气孔变大,使熔渣和氧气更易进入制品内部,进一步导致材料结构的破坏,降低材料其它方面的性能,严重地影响着材料的质量。
发明内容
本发明的目的在于研究一种高抗侵蚀性碳化硅砖及其制备方法,其要解决的技术问题:克服现有耐火材料的缺点,提供一种高抗侵蚀碳化硅砖,抑制或减缓碳化硅材料的氧化分解,增强材料的抗侵蚀性,以满足高温窑炉对高性能碳化硅制品的需求。
本发明的技术方案是:
以重量百分比计原料为碳化硅砂、无定形二氧化硅、Al4SiC4、金属硅粉、炭黑和结合剂,所述碳化硅砂包括粒度3~1mm、小于1mm和小于0.088mm三个粒度段,其中3~1mm的碳化硅砂为25~45%,小于1mm的碳化硅砂为10~25%,小于0.088mm的碳化硅砂为25~45%;无定形二氧化硅0~8%,粒度不大于0.044mm的Al4SiC4为1~10%,粒度不大于0.088mm的金属硅粉为1~8%,粒度不大于0.088mm的炭黑0~6%,另外加入占上述原料总重2~4%的硅溶胶结合剂。
所述高抗侵蚀性碳化硅砖,其特征是:所述碳化硅砂的重量组成为:SiC≥90%。
所述高抗侵蚀性碳化硅砖,其特征是:所述硅溶胶结合剂,SiO2固含量20~40%,体积密度1.1~1.3g/cm3。。
所述高抗侵蚀性碳化硅砖的主要成分为:SiC67~97%,主晶相为碳化硅和一定量v的Al4SiC4相。
本发明所述高抗侵蚀性碳化硅砖的制备方法,包括称取原料、湿碾、成型、干燥和高温烧成,其特征是:所述成型时采用液压压力机或摩擦压力机压制成砖坯,所述干燥是将砖坯在110~160℃下干燥8~24h,加热至1250~1500℃,并在此温度下保温2~15h烧成,自然冷却后出窑。
本发明的创新性在于:Al4SiC4具有高熔点、高化学稳定性、高强度,优异的抗氧化和抗水化性能等优点,在碳化硅材料中,引入Al4SiC4,一方面,Al4SiC4填充在颗粒之间,可以降低气孔率、结构致密、强度增强;另一方面,Al4SiC4在高温过程中与O2发生反应,生成连续的铝硅酸盐玻璃相,包覆在材料的表面,阻止熔渣和氧气向材料内部的扩散,提高材料的抗氧化性和抗侵蚀性能。
其反应方程式如下:
本发明的积极有益效果:
(1)本发明通过调整原料配比和粒度组成,优化产品配方,通过引入Al4SiC4,有效改善碳化硅砖的抗氧化性和抗侵蚀性能,该砖的强度高、热膨胀系数小、耐磨损性好、抗侵蚀性好等优点。
(2)本发明通过合理控制高温烧结温度和烧结时间,得到的产品性能稳定,并且生产成本较低,具有较好的经济和社会效益,值得推广应用。
具体实施方式
下面是本发明实施例,用来更好理解本发明,并不是对本发明的任何限制。
其中3~1mm的碳化硅砂为25~45%,小于1mm的碳化硅砂为10~25%,小于0.088mm的碳化硅砂为25~45%;无定形二氧化硅0~8%,粒度不大于0.044mm的Al4SiC4为1~10%,粒度不大于0.088mm的金属硅粉为1~8%,粒度不大于0.088mm的炭黑0~6%,另外加入占上述原料总重2~4%的硅溶胶结合剂。
实施例1:
高抗侵蚀性碳化硅砖,以重量百分比表示,原料为:3~1mm的碳化硅占38%,小于1mm的碳化硅占20%,小于0.088mm的碳化硅占30%,小于0.088mm的金属硅粉占3%,小于0.044mm的Al4SiC4占6%,小于0.088mm的炭黑2%,无定形SiO2占1%,另外添加上述原料总重2%的硅溶胶作为粘合剂,硅溶胶密度为1.25g/cm3。
其中碳化硅的重量组成为:SiC≥97%。
制备方法:将原料经湿碾机混料,采用液压压力机成型,将成型后的砖坯装入干燥窑内,在135℃干燥8h,然后加热至1480℃,并在此温度下保温3h烧成,自然冷却出窑,得到的碳化硅砖的主要成分为:SiC≥85%。
其性能指标见下表1:
实施例2:
高抗侵蚀性碳化硅砖,以重量百分比表示,原料为:3~1mm的碳化硅占30%,小于1mm的碳化硅占20%,小于0.088mm的碳化硅占33%,小于0.088mm的金属硅粉占2%,小于0.044mm的Al4SiC4占9%,小于0.088mm的炭黑1%,无定形SiO2占1%,另外添加上述原料总重4%的硅溶胶作为粘合剂,硅溶胶密度为1.25g/cm3。
其中碳化硅的重量组成为:SiC≥95%。
制备方法:将原料经湿碾机混料,采用液压压力机成型,将成型后的砖坯装入干燥窑内,在125℃干燥4h,然后加热至1400℃,并在此温度下保温5h烧成,自然冷却出窑,得到的碳化硅砖的主要成分为:SiC≥79%。
其性能指标见下表2:
实施例3:
高抗侵蚀性碳化硅砖,以重量百分比表示,原料为:3~1mm的碳化硅占28%,小于1mm的碳化硅占20%,小于0.088mm的碳化硅占30%,小于0.088mm的金属硅粉占5%,小于0.044mm的Al4SiC4占6%,小于0.088mm的炭黑5%,无定形SiO2占6%,另外添加上述原料总重2.8%的硅溶胶作为粘合剂,硅溶胶密度为1.25g/cm3。
其中碳化硅的重量组成为:SiC≥90%。
制备方法:将原料经湿碾机混料,采用液压压力机成型,将成型后的砖坯装入干燥窑内,在115℃干燥5h,然后加热至1380℃,并在此温度下保温5h烧成,自然冷却出窑,得到的碳化硅砖的主要成分为:SiC≥70%。
其性能指标见下表3:
实施例4:
高抗侵蚀性碳化硅砖,以重量百分比表示,原料为:3~1mm的碳化硅占41%,小于1mm的碳化硅占21%,小于0.088mm的碳化硅占31%,小于0.088mm的金属硅粉占2%,小于0.044mm的Al4SiC4占3%,小于0.088mm的炭黑1%,无定形SiO2占1%,另外添加上述原料总重3.3%的硅溶胶作为粘合剂,硅溶胶密度为1.25g/cm3。
其中碳化硅的重量组成为:SiC≥97%。
制备方法:将原料经湿碾机混料,采用液压压力机成型,将成型后的砖坯装入干燥窑内,在155℃干燥2h,然后加热至1500℃,并在此温度下保温3h烧成,自然冷却出窑,得到的碳化硅砖的主要成分为:SiC≥90%。
其性能指标见下表4:
Claims (4)
1.一种高抗侵蚀性碳化硅砖,其特征在于:以重量百分比表示,原料为碳化硅砂、无定形二氧化硅、Al4SiC4、金属硅粉、炭黑和结合剂,所述碳化硅砂包括粒度3~1mm、小于1mm和小于0.088mm的三个粒度段,其中3~1mm的碳化硅砂为25~45%,小于1mm的碳化硅砂为10~25%,小于0.088mm的碳化硅砂为25~45%;无定形二氧化硅0~8%,粒度不大于0.044mm的Al4SiC4为1~10%,粒度不大于0.088mm的金属硅粉为1~8%,粒度不大于0.088mm的炭黑0~6%,另外加入占上述原料总重2~4%的硅溶胶结合剂;所述高抗侵蚀性碳化硅砖的主要成分为:SiC67~97%,含有1~10%的Al4SiC4相。
2.一种权利要求1所述的高抗侵蚀性碳化硅砖,其特征在于:所述碳化硅砂的重量组成为:SiC≥90%。
3.一种权利要求1或2所述的高抗侵蚀性碳化硅砖,其特征在于:所述的硅溶胶结合剂的SiO2固含量20~40%,体积密度1.1~1.3g/cm3。
4.一种权利要求1或2或3所述高抗侵蚀性碳化硅砖的制备方法,包括称取原料、湿碾、成型、干燥、烧成、自然冷却、出窑,其特征在于:所述成型为采用液压压力机或摩擦压力机压制成砖坯,所述干燥是将砖坯在110~160℃下干燥8~24h,加热至1250~1500℃,并在此温度下保温2~15h烧成。
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CN107746279A (zh) * | 2017-10-27 | 2018-03-02 | 南京柯瑞特种陶瓷股份有限公司 | Al4SiC4及Al复合增强的碳化硅蜂窝陶瓷及其制备方法 |
CN107814575A (zh) * | 2017-11-03 | 2018-03-20 | 江苏高淳陶瓷股份有限公司 | 一种Al4SiC4增强的碳化硅蜂窝陶瓷及其制备方法 |
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CN114230352A (zh) * | 2021-12-28 | 2022-03-25 | 宜兴瑞泰耐火材料工程有限公司 | 一种高耐磨和高抗侵蚀钼砖及其制备工艺 |
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