CN107200596B - 一种含多晶氧化铝纤维的刚玉质干式料 - Google Patents

一种含多晶氧化铝纤维的刚玉质干式料 Download PDF

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CN107200596B
CN107200596B CN201710617513.0A CN201710617513A CN107200596B CN 107200596 B CN107200596 B CN 107200596B CN 201710617513 A CN201710617513 A CN 201710617513A CN 107200596 B CN107200596 B CN 107200596B
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polycrystalline alumina
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肖家志
张三华
梁亚丽
石干
韦祎
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Sinosteel Luoyang Institute of Refractories Research Co Ltd
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Abstract

本发明属于耐火材料技术领域，主要涉及一种含多晶氧化铝纤维的刚玉质干式料。提出的一种含多晶氧化铝纤维的刚玉质干式料的原料组成及质量百分比为：刚玉颗粒65~78%；刚玉细粉5~15%；镁砂5~15%；氧化铝微粉0~8%；多晶氧化铝纤维1~9%；其中，所述的多晶氧化铝纤维为起助烧结作用的助烧结剂。本发明既降低了烧结温度，又保证了刚玉质干式料的使用性能，提高了衬体的使用寿命。

Description

一种含多晶氧化铝纤维的刚玉质干式料
技术领域
本发明属于耐火材料技术领域，主要涉及一种含多晶氧化铝纤维的刚玉质干式料。
背景技术
耐火材料中加入烧结助剂的目的是为了提高材料在高温下的致密性、强度和稳定性，以适应冶炼条件的需要；常规的烧结助剂作用机理是在高温下使颗粒的接触面出现液相，融合形成连续的网络，使整个材料连成一个整体；一般液相的出现可能是烧结助剂本身的熔点低，也可能是与烧结助剂形成低共熔物，但都会降低耐火材料的使用温度，影响高温下材料的使用寿命；为了满足高温苛刻条件下耐火材料的使用性能（致密性、高强度、高荷软等），使材料高温下融合形成一个整体，减少或消除由烧结助剂带入的杂质成分形成的危害，目前常用的方式是采用纳米技术；纳米技术的应用，可以降低耐火材料的烧结温度，使材料的结构微细化、致密化，提高材料的性能，但纳米粉存在易团聚，难分散，成本高等缺点，难以工业化大规模应用。
发明内容
本发明的目的是提出一种含多晶氧化铝纤维的刚玉质干式料，使其能促进刚玉质干式料的烧结，同时减少烧结助剂的危害。
本发明为完成上述目的采用如下技术方案：
一种含多晶氧化铝纤维的刚玉质干式料，所述的刚玉质干式料的原料组成及质量百分比为：
刚玉颗粒 65~78%；
刚玉细粉 5~15%；
镁砂 5~15%；
氧化铝微粉 0~8%；
多晶氧化铝纤维 1~9%；
其中，所述的多晶氧化铝纤维为起助烧结作用的助烧结剂；将刚玉颗粒、刚玉细粉、镁砂、氧化铝微粉和多晶氧化铝纤维混合均匀即制得含多晶氧化铝纤维的刚玉质干式料。
所述的刚玉质干式料的原料组成及质量百分比为：
刚玉颗粒 70~72%；
刚玉细粉 10~12%；
镁砂 8~10%；
氧化铝微粉 0~8%；
多晶氧化铝纤维 1~9%。
所述刚玉颗粒的粒径范围为0.044-6mm。
所述的刚玉颗粒为电熔刚玉、烧结氧化铝、板状刚玉中的一种。
所述镁砂的粒径范围为0.044-1mm。
所述的镁砂为电熔镁砂、烧结镁砂中的一种。
所述的氧化铝微粉为粒径d50＜5μm的煅烧氧化铝微粉。
所述的多晶氧化铝纤维粒径为0.3~8μm，化学成分w（Al2O3+SiO2）＞99%，w（Al2O3）＞95.0%。
本发明提出的一种含多晶氧化铝纤维的刚玉质干式料，多晶氧化铝纤维具有优异的高温性能，良好的节能效果，应用在耐火材料高温领域具有可观的经济效益，但纤维的稳定性差，易析晶粉化，对材料的性能不利，应用受限；本发明恰好利用纤维易析晶粉化的特性，对多晶氧化铝纤维进行改造处理，将其运用在刚玉质干式料中，起到助烧结的作用；通过利用多晶氧化铝纤维易析晶粉化特性，既降低了烧结温度，又保证了刚玉质干式料的使用性能，提高了衬体的使用寿命。
具体实施方式
本发明以中频炉用刚玉质干式料为例，对多晶氧化铝纤维的应用效果加以说明；为充分说明本发明的特点，以实施例1~7为例，与不加烧结助剂的对比例1和加氧化硅微粉为烧结助剂的对比例2、3比较，加以说明。
实施例1~7
含多晶氧化铝纤维的刚玉质干式料实施例1~7，以0.044-6mm的电熔白刚玉（w（Al2O3）=99.21%、w（SiO2）=0.36%）为主料，以0.044-1mm的电熔镁砂（w（MgO）=97.87%、w（SiO2）=0.76%、w（CaO）=0.73%），煅烧氧化铝微粉（w（Al2O3）=99.34%、w（SiO2）=0.14%、d50＜5μm）和多晶氧化铝纤维（w（Al2O3）＞95.0%、w（SiO2）＜4.0%、粒度0.3~8μm）为辅料组成，所述的多晶氧化铝纤维是用常规的多晶氧化铝纤维通过分散、过滤、干燥、球磨所得，这种处理后的纤维极易析晶粉化，应用在刚玉质干式料中，起到助烧结的作用。具体方案见表1。
通过表2的性能测试结果可知，与对比例1相比，实施例1~7中刚玉质干式料的低融物减少，随着温度的升高，各项指标都得到了优化；虽然对比例2中干式料的性能也有改善，但对比例3中干式料的荷重软化温度T0.6已经急剧下降。由于干式料在混料和成形过程中，容易发生偏析，而常规烧结助剂的加入对材料的影响巨大，一旦偏析造成烧结助剂的局部集中，对衬体的影响是致命的，因此，氧化硅微粉的引入需要很谨慎，要控制在合适的范围内。总之，消除烧结助剂的不利影响具有重要意义，而本发明所述的含多晶氧化铝纤维的刚玉质干式料则可以避免此不利影响。
表1 实施例和对比例的组分和具体配比方案
Figure DEST_PATH_IMAGE001
表2 实施例和对比例干式料的性能指标
Figure 890233DEST_PATH_IMAGE002
注： A代表1200℃*3h,B代表1350℃*3h,C代表1600℃*3h, D代表1500℃*3h。

Claims (8)

1.一种含多晶氧化铝纤维的刚玉质干式料，其特征在于：所述的刚玉质干式料的原料组成及质量百分比为：
刚玉颗粒 65~78%；
刚玉细粉 5~15%；
镁砂 5~15%；
氧化铝微粉 0~8%；
多晶氧化铝纤维 1~9%；
其中，所述的多晶氧化铝纤维为起助烧结作用的助烧结剂；将刚玉颗粒、刚玉细粉、镁砂、氧化铝微粉和多晶氧化铝纤维混合均匀即制得含多晶氧化铝纤维的刚玉质干式料。
2.如权利要求1所述的一种含多晶氧化铝纤维的刚玉质干式料，其特征在于：所述的刚玉质干式料的原料组成及质量百分比为：
刚玉颗粒 70~72%；
刚玉细粉 10~12%；
镁砂 8~10%；
氧化铝微粉 0~8%；
多晶氧化铝纤维 1~9%。
3.如权利要求1所述的一种含多晶氧化铝纤维的刚玉质干式料，其特征在于：所述刚玉颗粒的粒径范围为0.044-6mm。
4.如权利要求1所述的一种含多晶氧化铝纤维的刚玉质干式料，其特征在于：所述的刚玉颗粒为电熔刚玉、烧结氧化铝、板状刚玉中的一种。
5.如权利要求1所述的一种含多晶氧化铝纤维的刚玉质干式料，其特征在于：所述镁砂的粒径范围为0.044-1mm。
6.如权利要求1所述的一种含多晶氧化铝纤维的刚玉质干式料，其特征在于：所述的镁砂为电熔镁砂、烧结镁砂中的一种。
7.如权利要求1所述的一种含多晶氧化铝纤维的刚玉质干式料，其特征在于：所述的氧化铝微粉为粒径d50＜5μm的煅烧氧化铝微粉。
8.如权利要求1所述的一种含多晶氧化铝纤维的刚玉质干式料，其特征在于：所述的多晶氧化铝纤维粒径为0.3~8μm，化学成分w（Al2O3+SiO2）＞99%，w（Al2O3）＞95.0%。
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