还原气氛下二茂铁对不烧镁钙系耐火材料性能的影响

Effect of ferrocene on properties of unburnt magnesia-calcium refractories in reducing atmosphere

以人工合成镁钙砂和电熔镁砂为主要原料,无水酚醛树脂为结合剂,二茂铁为催化剂,制备不烧镁钙系耐火材料。探究在还原气氛下二茂铁对不烧镁钙系耐火材料性能的影响,并利用SEM和XRD对试样的显微结构进行观察分析。结果表明:(1)二茂铁的加入使得不烧镁钙系耐火材料的常温力学性能、抗水化性能及高温性能等均有所提高,其抗水化性能及抗渣性能显著提高,荷重软化温度提高和压蠕变性能的改善增强了实际应用能力;(2)通过观察加入1%二茂铁的不烧镁钙系耐火材料的微观组织结构,发现催化无水酚醛树脂形成原位合成网架结构,且铁、碳元素主要分布在有机网架结构内,可以改善性能;(3)还原气氛下1200℃热处理后,二茂铁的加入仍会对试样的体积密度、显气孔率和常温耐压强度起到改善作用,试样的原位合成有机网架结构和铁、碳元素的颗粒分布即使在高温下仍有所保留,并没有完全破坏。

Unburnt magnesia-calcium refractories were prepared by using synthetic magnesia-calcium sand and fused magnesia sand as main raw materials,anhydrous phenolic resin as binder and ferrocene as catalyst.The effect of ferrocene on the properties of unburnt magnesia-calcium refractories in reducing atmosphere was investigated,and the microstructure of the samples were observed and analyzed by SEM and XRD.The results show that:(1)The addition of ferrocene improves the cold crushing strength,hydration resistance and high temperature performance of the unburnt magnesia-calcium refractories,and their hydration resistance and slag resistance are significantly improved.The increase of refractoriness under load and the improvement of compressive creep performance enhance the practical application ability;(2)Observing the microstructure of the unburnt magnesia-calcium refractories with 1%ferrocene content,it is found that the anhydrous phenolic resin is catalyzed to form an in-situ synthetic grid structure,and iron and carbon elements are mainly distributed in the organic grid structure,performances can be improved;(3)After heat treatment at 1200℃in a reducing atmosphere,the introduction of ferrocene will still improve the bulk density,apparent porosity and cold crushing strength of the sample.The in-situ synthesis of the organic grid structure and the particle distribution of iron and carbon are still retained even at high temperatures,and are not completely destroyed.