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骨料部分采用锆酸钙颗粒(粒度≤0.374mm和≤0.147mm),基质部分采用6%的α-Al2O3微粉,在基质部分分别加入2%、4%、6%、8%的CaSiO3以及3%CaSiO3-3%SiO2、3%CaSiO3-3%ZrSiO4,经冷等静压成型、干燥后于1550℃,3h烧成制得复合了CaSiO3的CaZrO3-Al2O3接触层,对接触层检测其显气孔率及体积密度,同时进行XRD及SEM分析,并建立抗附着模型对比了CaSiO3复合添加剂对接触层抗Al2O3附着性能的影响。结果表明,随着CaSiO3含量的增加,接触层的致密化程度先增加后减小,其促进CaZrO3分解的程度变大,抗Al2O3附着的性能增强。在添加剂量相同的情况下,CaSiO3复合添加剂抗Al2O3附着堵塞的效果要比单独加入CaSiO3的好,其中CaSiO3-SiO2复合添加剂抗Al2O3附着堵塞的效果最佳。此外,CaSiO3复合添加剂不仅可以细化CaZrO3颗粒,而且使颗粒间结合更为紧密;颗粒越小,其晶界面积越大,CaZrO3分解出的CaO沿晶界扩散就越快,从而与Al2O3反应的程度越大。
Aggregate part is made of calcium zirconate particles (particle size ≤0.374mm and ≤0.147mm). The matrix part is made up of 6% α -Al2O3 micropowder. Add 2%, 4%, 6%, 8% CaSiO3 and 3% % CaSiO3-3% SiO2, 3% CaSiO3-3% ZrSiO4, after cold isostatic pressing, drying and calcining at 1550 DEG C for 3h to obtain a CaZrO3-Al2O3 contact layer with CaSiO3 compound, Rate and bulk density, and XRD and SEM analysis were also carried out. The anti-adhesion model was established to compare the effect of CaSiO3 additive on the anti-Al2O3 adhesion of the contact layer. The results show that with the increase of CaSiO3 content, the densification degree of contact layer first increases and then decreases, and the extent of CaZrO3 decomposition increases and the performance of anti-Al2O3 adhesion increases. In the same dosage, CaSiO3 composite additive is more effective than Al 2 O 3 alone in blocking the adhesion of Al 2 O 3, and CaSiO 3 -SiO 2 composite additive has the best effect of blocking the Al 2 O 3 adhesion. In addition, the CaSiO3 composite additive can not only refine the CaZrO3 particles, but also make the particles bond more tightly; the smaller the particle size is, the larger the grain boundary area is, and the CaO decomposed by CaZrO3 diffuses rapidly along the grain boundaries to react with Al2O3 The greater the degree.