CN110467435B - 一种(Al2OC)x(AlN)1-x固溶体结合MgO-C砖及其制备方法 - Google Patents

一种(Al2OC)x(AlN)1-x固溶体结合MgO-C砖及其制备方法 Download PDF

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CN110467435B
CN110467435B CN201910642055.5A CN201910642055A CN110467435B CN 110467435 B CN110467435 B CN 110467435B CN 201910642055 A CN201910642055 A CN 201910642055A CN 110467435 B CN110467435 B CN 110467435B
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李勇
吴晓芳
李宏宇
薛文东
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Abstract

本发明提供了一种(Al2OC)x(AlN)1‑x固溶体结合MgO‑C砖及其制备方法，属于耐火材料领域。该(Al2OC)x(AlN)1‑x固溶体结合MgO‑C砖的制备原料包括：54～95份电熔镁砂，2～18份金属铝粉，2～18份活性氧化铝微粉，1～10份石墨以及额外1～6份的结合剂液态酚醛树脂。本发明将将金属铝粉和活性氧化铝微粉引入MgO‑C砖中，以此制备(Al2OC)x(AlN)1‑x固溶体结合MgO‑C砖，提高MgO‑C砖的性能。该制备方法原料简单、成本低廉、设备要求低，可制备(Al2OC)x(AlN)1‑x固溶体结合MgO‑C砖，可大规模制备。

Description

一种(Al2OC)x(AlN)1-x固溶体结合MgO-C砖及其制备方法
技术领域
本发明涉及耐火材料领域，特别涉及一种(Al2OC)x(AlN)1-x固溶体结合 MgO-C砖及其制备方法。
背景技术
MgO熔点高达2800℃，化学性能稳定，但是容易被熔渣润湿且热膨胀率高。石墨化学性能稳定且具有高热传导性和低热膨胀性。MgO和石墨复合的 MgO-C耐火材料具有优异的抗炉渣侵蚀性和抗热震性。但是石墨极易被气氛中的氧化性气体和渣中的铁氧化物氧化，造成MgO-C复合材料的损毁，并且高含量C不利于洁净钢的生产。现有技术存在的缺点：需要、在不降低材料使用性能的前提下降低MgO-C材料中的C含量，并提高材料的抗氧化性。
作为Al2OC与AlN的固溶体，(Al2OC)x(AlN)1-x固溶体具有熔点高、高温稳定性好和耐蚀性优异外，还具有碳化物热导率高、热膨胀率小、抗热冲击性好等优点，有望降低MgO-C材料中的C含量并提升抗氧化性，成为MgO-C材料高效的增强相。现有技术存在的缺点：通常以AlN、Al4C3、Al2O3为原料通过高温热压来制备(Al2OC)x(AlN)1-x固溶体，设备要求高并且对生产环境的湿度有要求，实现(Al2OC)x(AlN)1-x固溶体的工业化生产较为困难。
发明内容
本发明为了克服上述现有技术的缺点提出的，其所解决的技术问题是提供一种性能更加优良且制备简单的(Al2OC)x(AlN)1-x固溶体结合MgO-C砖，以及这种耐火材料的制备方法。
一种(Al2OC)x(AlN)1-x固溶体结合MgO-C砖，其特征在于其原料组成为 54～95份电熔镁砂，2～18份金属铝粉，2～18份氧化铝微粉，1～10份石墨以及额外1～6份的结合剂酚醛树脂。
进一步地，所述氧化铝微粉为活性氧化铝微粉。
进一步地，所述酚醛树脂为液态酚醛树脂。
一种如上所述的(Al2OC)x(AlN)1-x固溶体结合MgO-C砖的制备方法，其特征在于将生坯在氮气炉置于氮化炉进行高温烧结，随后随炉冷却，得到 (Al2OC)x(AlN)1-x固溶体结合MgO-C砖。
进一步地，所述烧结时通入纯度高于99vol％，压力高于0.002MPa的流动氮气。
进一步地，所述烧结是先升温至500-600℃并保温1h以上，随后升温至 1300-1800℃并保温1h以上，随炉冷却，得到(Al2OC)x(AlN)1-x固溶体结合 MgO-C砖。
该制备方法原料简单、成本低廉、设备要求低，可制备(Al2OC)x(AlN)1-x固溶体结合MgO-C砖，可大规模制备。
具体实施方式
本发明实施例提供的一种(Al2OC)x(AlN)1-x固溶体结合MgO-C砖，其原料组成如下：54～95份电熔镁砂，2～18份金属铝粉，2～18份氧化铝微粉，1～10份石墨以及额外1～6份的态酚醛树脂结合剂，其中所述氧化铝微粉为活性氧化铝微粉，所述酚醛树脂为液态酚醛树脂。
一种(Al2OC)x(AlN)1-x固溶体结合MgO-C砖的制备方法，其特征在于包括以下步骤：在氮气炉通入纯度高于99vol％，压力高于0.002MPa的流动氮气进行烧结，先升温至500～660℃并保温1h以上，随后升温至1300～1800℃并保温1h 以上，随炉冷却，即得到(Al2OC)x(AlN)1-x固溶体结合MgO-C砖。该制备方法原料简单、成本低廉、设备要求低，可制备(Al2OC)x(AlN)1-x固溶体结合MgO-C砖，可大规模制备。
实施例1
一种(Al2OC)x(AlN)1-x固溶体结合MgO-C砖，其原料组成如下：74份电熔镁砂，12份金属铝粉，12份活性氧化铝微粉，2份石墨以及额外3.5份的液态酚醛树脂结合剂，所述金属铝粉的粒度为0-45μm，所述酚醛树脂为液态酚醛树脂。
所述的(Al2OC)x(AlN)1-x固溶体结合结合MgO-C砖的制备方法如下：将生坯置于氮气炉并通入纯度为99.9vol％，压力为0.01MPa的氮气进行烧结，先升温至580℃并保温8h，随后升温至1600℃并保温3h，再随炉冷却，得到 (Al2OC)x(AlN)1-x固溶体结合MgO-C砖。
实施例2
一种(Al2OC)x(AlN)1-x固溶体结合MgO-C砖，其原料组成如下：75份电熔镁砂，11份金属铝粉，11份活性氧化铝微粉，3份石墨以及额外3.5份的液态酚醛树脂结合剂，所述金属铝粉的粒度为0-45μm，所述酚醛树脂为液态酚醛树脂。
所述的(Al2OC)x(AlN)1-x固溶体结合结合MgO-C砖的制备方法如下：将生坯置于氮气炉并通入纯度为99.9 9vol％，压力为0.05MPa的氮气进行烧结，先升温至580℃并保温6h，随后升温至1600℃并保温3h，再随炉冷却，得到 (Al2OC)x(AlN)1-x固溶体结合MgO-C砖。
以上所述的实施例仅用以说明本发明的技术方案而非限制，所属领域技术人员应该理解，本领域技术人员对本发明的技术方案做出各种变形和改进，而不脱离本发明技术方案的精神和范围，其均应涵盖在本发明的权利要求范围内。

Claims (4)

1.一种(Al2OC)x(AlN)1-x固溶体结合MgO-C砖，其特征在于其原料组成为54~95份电熔镁砂，2~18份金属铝粉，2~18份氧化铝微粉，1~10份石墨以及额外1~6份的结合剂酚醛树脂；
所述氧化铝微粉为活性氧化铝微粉；
所述酚醛树脂为液态酚醛树脂。
2.一种根据权利要求1所述(Al2OC)x(AlN)1-x固溶体结合MgO-C砖的制备方法，其特征在于将生坯置于氮气炉进行高温烧结，随后随炉冷却，得到(Al2OC)x(AlN)1-x固溶体结合MgO-C砖。
3.根据权利要求2所述(Al2OC)x(AlN)1-x固溶体结合MgO-C砖的制备方法，其特征在于：所述烧结时通入纯度高于99 vol%，压力高于0.002 MPa的流动氮气。
4.根据权利要求2所述(Al2OC)x(AlN)1-x固溶体结合MgO-C砖的制备方法，其特征在于：所述烧结是先升温至500-600 ℃并保温1 h以上，随后升温至1300-1800 ℃并保温1 h以上，随炉冷却，得到(Al2OC)x(AlN)1-x固溶体结合MgO-C砖。
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