钙铝硅涂层增强建筑陶瓷的制备及性能研究

Preparation and Properties of Calc-aluminosilicate Coating Reinforced Building Ceramic Tiles

以硅灰石、石英、Al_(2)O_(3)为原料制备具有较低膨胀系数的钙铝硅质涂层。通过调整涂层的组成来对基体产生适当的压应力,从而提高陶瓷的抗折强度。研究了涂层热膨胀系数、厚度及保温时间对抗折强度的影响,分析了涂层材料的物相组成。结果表明:当涂层中Al_(2)O_(3)含量为8.1wt%、涂层厚度约为101μm,球磨时间3h,烧成温度为1170℃,保温为30min时,可获得抗折强度最优的钙铝硅质涂层复合陶瓷。此时基体和涂层的膨胀系数分别为8.73×10^(-6)℃^(-1)和6.06×10^(-6)℃^(-1),制得的涂层复合陶瓷抗折强度(103±3MPa)比无涂层样品(66±2MPa)提高了56%。

The calc-aluminosilicate coatings with low coefficient of thermal expansion(CTE)were prepared using wollastonite,quartz and Al_(2)O_(3)as raw materials.By adjusting the composition of the coating to produce appropriate compressive stress on the matrix,the flexural strength of the ceramic is improved.The effects of CTEs,soaking time and thicknesses of the coating on the bending strength were studied and phase compositions of coating materials were analyzed.The results show that the optimal bending strength of calcaluminosilicate coated composite ceramics is obtained when the coating contains 8.1 wt%Al_(2)O_(3),the thickness of coating is about 101μm,the time of ball-milling is 3h and the soaking temperature is 1170℃for 30 min.In this condition,the CTEs of substrate and coating are 8.73×10^(-6)℃^(-1)and 6.06×10^(-6)℃^(-1),respectively.The flexural strength of the prepared composite ceramics(103±3 MPa)is 56%higher than that of the uncoated Sample(66±2 MPa).