多孔镁基陶瓷型芯的性能研究

Research on Properties of Porous Magnesium-Based Ceramic Core

利用干压法制备了多孔氧化镁基陶瓷型芯样品,研究了不同Al2O3的添加量、烧结温度、陶瓷腐蚀温度和酸液浓度对样品性能的影响。结果表明:当Al2O3添加量为15wt.%时,经1 600℃烧结保温2 h的样品综合性能最好,此时样品的线收缩率为1.99%,抗弯强度为11.41 MPa,气孔率为34.25%;经1 600℃/2 h烧结的样品,在1 000℃时高温强度为25.94 MPa,要比经1 500℃/2 h烧结的样品高;该材料的高温强度随温度升高而逐渐下降;该材料的腐蚀效果在CH3COOH浓度为40wt.%和温度为150℃时较佳。

The porous magnesium-based ceramic core was prepared by using the dry pressing processes. The effect of different contents of alumina, sintering temperature, ceramic corrosion temperature and acid concentration on the properties of the magnesium-based ceramic core were investigated. The result indicates that the sample sintered at 1 600℃for 2 h had linear shrinkage ratio of 1.99%, bending strength of 11.41 MPa and the porosity of 34.25% when the adding amount of alumina was 15wt.%. The sample sintered at 1 600℃ for 2 h had high temperature strength of 25.94 MPa at 1 000℃, which was higher than that sintered at 1 500 ℃for 2 h. With the increasing of the measuring temperature, the high temperature strength would decrease. When the temperature was 150℃ and the concentration of acetic acid was 40wt.%, the corrosion effect was the best.