CaO-Al_2O_3-SiO_2-B_2O_3系电瓷釉成分对其热性能的影响

Effect of composition on the thermal performance of CaO-Al_2O_3-SiO_2-B_2O_3 electrical ceramic glaze

系统研究了CaO-Al2O3-SiO2-B2O3系电瓷釉成分与其热性能的关系,采用XRD、热分析仪等测试手段,分析了成分对其软化点、热膨胀系数和烧成温度与软化点的温度差ΔT的影响规律。结果表明,B2O3对电瓷釉有助熔作用,随着B2O3含量的增加软化点呈现先升高后降低的趋势,而ΔT则随之减小;增加SiO2成分含量将会提高电瓷釉的烧成温度、软化点和ΔT;随着Al2O3成分含量的增加软化点和ΔT曲线分别存在极大值和极小值。热膨胀系数随着成分的变化总是呈现出与软化点相反的规律。

The relationship between composition and thermal behavior of electrical ceramic glazes based on CaO-Al2 O3-SiO2-B2 O3 system were investigated.The effect of composition on softening point,coefficient of thermal expansion and temperature difference of firing temperature and softening temperature by using the testing means of X-ray diffraction and thermal analyzer.With the increase of B2 O3 content the softening point increases first and then decreases,while the firing temperature andΔT decreases.All of the firing temperature,soften-ing point andΔT increase when the content of SiO2 increases.With the increase of B2 O3 content the softening point andΔT have maximum and minimum value separately.As the component changes,the trend of coeffi-cient of thermal expansion was always opposite of softening point.