CN106083076A - 一种环形炉炉底板用Si‑SiC复合耐高温陶瓷及制备炉底板方法 - Google Patents
一种环形炉炉底板用Si‑SiC复合耐高温陶瓷及制备炉底板方法 Download PDFInfo
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Abstract
一种环形炉炉底板用Si‑SiC复合耐高温陶瓷,其原料组成及wt%为:粒度3~1mm的SiC:30~50%,粒度0.074至小于1 mm的SiC:15~35%,粒度小于0.074mm的SiC:30~45%,粒度小于0.074mm的炭粉:1~10%,另添加有:上述原料总重量百分比4~9%的结合剂;制备步骤:混料及碾压;成型;干燥;进行渗硅反应烧结;进行机械加工制得环形炉用炉底板。本发明用Si‑ SiC复合高温陶瓷制备的环形炉,具有耐高温、抗蠕变性能好、高温强度大、抗热震性好,不会开裂,从而提高了干卷的表面质量;炉底板的使用周期由现在的10个月提高至12个月及以上,且成本只有耐热合金材料的一半。
Description
技术领域
本发明涉及一种高温陶瓷,具体地属于一种用于环形炉炉底板的Si-N-Al-C复合耐高温陶瓷及制备炉底板的方法。
背景技术
长期以来,在冶金及机械制造工厂的环形炉中,炉底板均采用的是耐热钢质材料制备而成,以承载钢卷和钢件进行热加工生产。这种采用高温合金材料制造的炉底板,由于长时间在950℃左右甚至超过1000℃的高温与荷重的工况条件下工作,炉底板的高温合金材料的耐高温性能特别是高温强度和抗蠕变性能,不能够满足实际工况的要求,金属材料的高温蠕变率大而造成炉底板逐渐弯曲变形,材料的热膨胀率大而造成炉底板开裂损坏,蠕变及开裂等因素造成高温合金材料制备的钢质炉底板之使用寿命较低,更重要的是变形的炉底板会影响所承载钢卷和钢件的热处理质量和成品率,降低生产效益。
本申请人经大量试验研究,发现本发明与现用的耐热钢相比,高温陶瓷材料具有高温强度高、抗蠕变性能好、热膨胀率小等优点,不仅可以有效提高底板的使用寿命、降低底板使用成本,而且可以保证所承载钢卷和钢件的热处理质量和成品率,提高经济效益。
发明内容
本发明在于克服现有技术存在的不足,提供一种高温强度高、抗蠕变性能好、热膨胀率小,且所制备使用的炉底板使用周期长,制备成本低的环形炉炉底板用Si-SiC复合耐高温陶瓷及制备炉底板方法。
实现上述目的的措施:
一种环形炉炉底板用Si-SiC复合耐高温陶瓷,其原料组成及重量百分比含量为:粒度3~1mm的SiC:30~50%,粒度0.074至小于1 mm的SiC:15~35%,粒度小于0.074mm的SiC:30~45%,粒度小于0.074mm的炭粉:1~10%,另外添加有:上述原料总重量百分比4~9%的结合剂。
其在于:所述的结合剂为:酚醛树脂或硅溶胶或水玻璃。
其在于:所述的SiC纯度不低于92wt%。
其在于:所述的炭粉含C量不低于90 wt %。
制备一种环形炉炉底板用Si-SiC复合耐高温陶瓷的方法,其步骤:
1)混料:将粒度3~1mm的SiC:30~50%,粒度0.074至小于1 mm的SiC:15~35%,粒度小于0.074mm的SiC:30~45%,粒度小于0.074mm的炭粉:1~10%,另外添加有:上述原料总重量百分比为4~9%的结合剂加入混碾机中进行混碾;
2)成型:将混碾的泥料装入模型中,采用捣打成型或振动成型制成炉底板湿坯;
3)进行干燥:将湿坯装入烘干炉中烘干,烘干温度在110~180℃,并在该温度下保温32~72h,获得生坯;
4)进行渗硅反应烧结:先在反应烧结炉内底部放置足够量金属Si以供高温蒸发使用;再将生坯置于反应烧结炉中烧结,反应烧结温度为1700~1850℃,并在该温度及炉内真空度小于100Pa的条件下保温6~36小时,制得炉底板毛坯;
5)将毛坯炉底板机械加工制得环形炉用Si-SiC质高温陶瓷炉底板。
本发明与现有技术相比,用Si- SiC复合高温陶瓷制备的环形炉,具有耐高温、抗蠕变性能好、高温强度大、抗热震性好,不会开裂,从而提高了干卷的表面质量;炉底板的使用周期由现在的10个月提高至12个月及以上,且制备炉底板工艺简单、成本只有耐热合金材料的一半。
具体实施方式
下面对本发明予以详细描述:
表1为本发明各实施例与对比例的原料取值列表;
表2为本发明各实施例与对比例的主要工艺参数取值及性能列表。
本发明各实施例均按照以下步骤生产:
1)混料:将粒度3~1mm的SiC:30~50%,粒度0.074至小于1 mm的SiC:15~35%,粒度小于0.074mm的SiC:30~45%,粒度小于0.074mm的炭粉:1~10%,另外添加有:上述原料总重量百分比为4~9%的结合剂加入混碾机中进行混碾;
2)成型:将混碾的泥料装入模型中,采用捣打成型或振动成型制成炉底板湿坯;
3)进行干燥:将湿坯装入烘干炉中烘干,烘干温度在110~180℃,并在该温度下保温32~72h,获得生坯;
4)进行渗硅反应烧结:先在反应烧结炉内底部放置足够量金属Si以供高温蒸发使用;再将生坯置于反应烧结炉中烧结,反应烧结温度为1700~1850℃,并在该温度及炉内真空度小于100Pa的条件下保温6~36小时,制得炉底板毛坯;
5)将毛坯炉底板机械加工制得环形炉用Si-SiC质高温陶瓷炉底板。
以下表1及表2中的实施例有关数据并非一一对应关系。
表1 本发明各实施例原料取值列表(wt%)
注:表中各实施例的:SiC的纯度均不低于 92wt%,炭粉含C量不低于90 wt %。
表2 本发明各实施例主要工艺参数取值及性能情况列表
从表2中的性能情况可以看出,本发明的耐高温陶瓷炉底板具有高温强度高、抗高温变形能力强的特点,实际在硅钢环形炉炉底板使用寿命不低于12个月,且硅钢钢卷变形小,根据统计,成本降低至少在50%。
本具体实施方式仅为最佳例举,并非对本发明技术方案的限制性实施。
Claims (5)
1.一种环形炉炉底板用Si-SiC复合耐高温陶瓷,其原料组成及重量百分比含量为:粒度3~1mm的SiC:30~50%,粒度0.074至小于1 mm的SiC:15~35%,粒度小于0.074mm的SiC:30~45%,粒度小于0.074mm的炭粉:1~10%,另外添加有:上述原料总重量百分比4~9%的结合剂。
2.如权利要求1所述的一种环形炉炉底板用Si-SiC复合耐高温陶瓷,其特征在于:所述的结合剂为:酚醛树脂或硅溶胶或水玻璃。
3.如权利要求1所述的一种环形炉炉底板用Si-SiC复合耐高温陶瓷,其特征在于:所述的SiC纯度不低于92wt%。
4.如权利要求1所述的一种环形炉炉底板用Si-SiC复合耐高温陶瓷,其特征在于:所述的炭粉含C量不低于90 wt %。
5.制备一种环形炉炉底板用Si-SiC复合耐高温陶瓷的方法,其步骤:
1)混料:将粒度3~1mm的SiC:30~50%,粒度0.074至小于1 mm的SiC:15~35%,粒度小于0.074mm的SiC:30~45%,粒度小于0.074mm的炭粉:1~10%,另外添加有:上述原料总重量百分比为4~9%的结合剂加入混碾机中进行混碾;
2)成型:将混碾的泥料装入模型中,采用捣打成型或振动成型制成炉底板湿坯;
3)进行干燥:将湿坯装入烘干炉中烘干,烘干温度在110~180℃,并在该温度下保温32~72h,获得生坯;
4)进行渗硅反应烧结:先在反应烧结炉内底部放置足够量金属Si以供高温蒸发使用;再将生坯置于反应烧结炉中烧结,反应烧结温度为1700~1850℃,并在该温度及炉内真空度小于100Pa的条件下保温6~36小时,制得炉底板毛坯;
5)将毛坯炉底板机械加工制得环形炉用Si-SiC质高温陶瓷炉底板。
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Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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US20080254271A1 (en) * | 2006-10-11 | 2008-10-16 | Ngk Insulators, Ltd. | Si-SiC BASED FIRED BODY AND METHOD FOR MANUFACTURING THE SAME |
CN102795859A (zh) * | 2012-08-17 | 2012-11-28 | 湖北红花高温材料有限公司 | 一种环形炉用SiC-Si3N4质高温陶瓷炉底板及其制备方法 |
CN102898165A (zh) * | 2012-11-07 | 2013-01-30 | 宜昌科博耐火材料有限公司 | 一种环形炉用SiSiC 质高温陶瓷炉底板及其制备方法 |
CN102898164A (zh) * | 2012-11-07 | 2013-01-30 | 湖北红花高温材料有限公司 | 一种步进式加热炉用SiSiC 质垫块及其制备方法 |
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Publication number | Priority date | Publication date | Assignee | Title |
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US20080254271A1 (en) * | 2006-10-11 | 2008-10-16 | Ngk Insulators, Ltd. | Si-SiC BASED FIRED BODY AND METHOD FOR MANUFACTURING THE SAME |
CN102795859A (zh) * | 2012-08-17 | 2012-11-28 | 湖北红花高温材料有限公司 | 一种环形炉用SiC-Si3N4质高温陶瓷炉底板及其制备方法 |
CN102898165A (zh) * | 2012-11-07 | 2013-01-30 | 宜昌科博耐火材料有限公司 | 一种环形炉用SiSiC 质高温陶瓷炉底板及其制备方法 |
CN102898164A (zh) * | 2012-11-07 | 2013-01-30 | 湖北红花高温材料有限公司 | 一种步进式加热炉用SiSiC 质垫块及其制备方法 |
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