CN116730714A - 一种酸性干式捣打料及其制备中频炉用耐火材料的应用 - Google Patents
一种酸性干式捣打料及其制备中频炉用耐火材料的应用 Download PDFInfo
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- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
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Abstract
本发明涉及耐火材料的技术领域，具体涉及一种酸性干式捣打料及其制备中频炉用耐火材料的应用。捣打料原料包括3mm<粒径≤8mm的微晶天然硅石，0.5mm<粒径≤3mm的微晶天然硅石，30目<粒径≤70目的微晶天然硅石；30目<粒径≤70目的天然酸洗硅石，粒径为270目的天然酸洗硅石；粒径为325目的熔融石英，3mm<粒径≤5mm的熔融石英，1mm<粒径≤3mm的熔融石英，粒径≤1mm的熔融石英；粒径为200目的氧化硼；粒径为200目硅酸钾。通过本发明的原料配方得到的捣打料具有良好的抗热震稳定性，不易开裂，原料成分简单、成本较低。
Description
技术领域
本发明涉及耐火材料技术领域，具体涉及一种大型中频炉冷启动的酸性干式捣打料及其制备中频炉用耐火材料的应用。
背景技术
捣打料是指用捣打(人工或机械)方法施工，并在高于常温的加热作用下硬化的不定型耐火材料。一般由耐火骨料、粉料、结合剂、外加剂经过混炼而成。按照材质分类有高铝质、粘土质、镁质、白云石质、锆质及碳化硅-碳质耐火捣打料。
目前球墨铸造中频炉炉衬使用普通硅石制作酸性干式捣打料，中频炉内衬是中频炉的关键部位，炉衬耐火材料会影响到中频炉的寿命，中频炉的炉衬厚度较薄、温度梯度较大，同时反复受到急冷急热作用，这种硅质材料由于SiO2在不同温度下产生多种晶型相变的原因，导致在使用时，现有产品呈现以下的严重缺陷与不足：1.材料热膨胀系数大，2.热震稳定性差，3.无法实现冷启动，4.使用寿命低。
专利CN109748577A公开了一种中频炉用捣打料及其制备方法，以重量份计，包括铝矾土50-80份，尖晶石20-30份，镁砂粉料10-20份，热固性树脂5-10份，干燥废硅泥20-40份，粒径为1-3mm的碳化硅颗粒10-20份，纯度为95wt％以上的石墨5-10份，固化后产品内部结构的连接强度、致密强度较高，使用效果好；具有良好的可塑性；通过添加铝质和镁质材料提高了产品的可塑性和强度，但是成分较为复杂，成本相对较高，且不能实现中频炉的冷启动。
发明内容
针对现有技术的酸性干式捣打料热膨胀系数高容易开裂、成分复杂的问题，本发明提供一种酸性干式捣打料及其制备中频炉用耐火材料的应用。
第一方面，本发明提供一种酸性干式捣打料，按质量百分数计，捣打料原料包括：
进一步的，按质量百分数计，捣打料原料包括：
进一步的，熔融石英和微晶天然硅石的质量比为1:1-3.6。
进一步的，原料按照粒径大小的顺序加入之后混合。
第二方面，本发明提供一种酸性干式捣打料在制备中频炉用耐火材料中的应用。
进一步的，酸性干式捣打料在1250℃烧结3h，线性变化率≤1.2％，耐压强度≥8Mpa。
进一步的，酸性干式捣打料在1450℃烧结3h，线性变化率≤3.0％，耐压强度≥6Mpa。
本发明的有益效果在于：本发明采用的原料中微晶天然硅石、熔融石英和天然酸洗硅石均具有极低的热膨胀系数，且三种原材料在各个温度点的膨胀峰值不同，通过本发明的原料配方得到的捣打料具有良好的抗热震稳定性，保证材料在球墨铸铁中频炉冷启动的条件下，具有不开裂的良好体积稳定性；在基质部分添加高效烧结剂(氧化硼、硅酸钾)，既保证了材料的烧结性又有优良的高温性能；而且本发明的原料简单，原料大部分为硅石(微晶天然硅石、天然酸洗硅石)，成本较低。
具体实施方式
为了使本技术领域的人员更好地理解本发明中的技术方案，下面将对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都应当属于本发明保护的范围。
实施例1
按照质量百分数计，捣打料的原料包括：
原料按照颗粒的粒径由大到小加入后混合；将得到的捣打料加入烧结模中，分别在1250℃下烧结3h和在1450℃下烧结3h，比较两种温度下材料的线性变化率和耐压强度，检测结果见表1。
实施例2
按照质量百分数计，捣打料的原料包括：
按照颗粒的粒径由大到小加入后混合；将得到的捣打料加入到烧结模中，分别在1250℃下烧结3h和在1450℃下烧结3h，比较两种温度下材料的线性变化率和耐压强度，检测结果见表1。
实施例3
按照质量百分数计，捣打料的原料包括：
原料按照颗粒的粒径由大到小加入后混合；将得到的捣打料加入到烧结模中，分别在1250℃下烧结3h和在1450℃下烧结3h，比较两种温度下材料的线性变化率和耐压强度，检测结果见表1。
对比例1
按照质量百分数计，捣打料包括：
按照颗粒的粒径由大到小加入后混合；将得到的捣打料加入到烧结模中，分别在1250℃下烧结3h和在1450℃下烧结3h，比较两种温度下材料的线性变化率和耐压强度，检测结果见表1。
对比例2
按照质量百分数计，捣打料包括：
原料按照颗粒的粒径由大到小加入后混合；将得到的捣打料加入到烧结模中，分别在1250℃下烧结3h和在1450℃下烧结3h，比较两种温度下材料的线性变化率和耐压强度，检测结果见表1。
表1检测结果
通过实验检测数据说明，实施例中的捣打料具有良好的耐压强度，线性变化率较低避免了因为膨胀开裂的问题，仅使用微晶天然硅石或者仅使用熔融石英均无法达到良好的线性变化率和耐压强度，说明两种原料在不同温度点的膨胀峰值不同，经过配制的符合捣打料具有良好的热震稳定性，可以保证捣打料在冷启动的条件下，具备不开裂的良好体积稳定性。
尽管通过优选实施例的方式对本发明进行了详细描述，但本发明并不限于此。在不脱离本发明的精神和实质的前提下，本领域普通技术人员可以对本发明的实施例进行各种等效的修改或替换，而这些修改或替换都应在本发明的涵盖范围内/任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本发明的保护范围之内。
Claims (8)
1.一种酸性干式捣打料，其特征在于，按质量百分数计，原料包括：
2.如权利要求1所述的一种酸性干式捣打料，其特征在于，氧化硼的粒径为200目，硅酸钾的粒径为200目。
3.如权利要求1所述的一种酸性干式捣打料，其特征在于，按质量百分数计，原料包括：
4.如权利要求1所述的一种酸性干式捣打料，其特征在于，熔融石英和微晶天然硅石的质量比为1:1-3.6。
5.如权利要求1所述的一种酸性干式捣打料，其特征在于，原料按照粒径大小的顺序加入之后混合。
6.一种如权利要求1所述的酸性干式捣打料在制备中频炉用耐火材料中的应用。
7.如权利要求6所述的应用，其特征在于，酸性干式捣打料在1450℃烧结3h，线性变化率≤3.0％，耐压强度≥6Mpa。
8.如权利要求6所述的应用，其特征在于，酸性干式捣打料在1250℃烧结3h，线性变化率≤1.2％，耐压强度≥8Mpa。
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