稀土磷酸铬铝粘接剂的制备及其热处理中的相变研究

Preparation of Rare Earth-Aluminum-Chromium-Phosphate Binder and Phase Evolution Research during Heat Treatment

以Al（OH）3、H3PO4、CrO3、CH]OH和La2O3为原料制备稀土磷酸铬铝，通过对反应体系黏度、pH值及其吸潮率、热失重率和粘接性能的测试．确定反应物加入顺序、反应温度、酸质量分数、稀土添加量及反应时间。采用TG-DSC、XRD和瓜分析研究了体系的固化特性和耐热性能。结果表明，反应最佳条件为：以H3PO4、Al（OH）3、Cr03、La2o3和CH30H为原料添加顺序，n（Cro3）：n（Al（Oho3）：n（H3Po4）：n（La2O3）为1：3：9：0．19，磷酸质量分数65％，稀土反应温度140℃，反应时间1h。稀土磷酸铬铝在200～975℃以内时是非晶相，9751200℃时主要是AIP04、Al（PO3）3和Cr（PO3）33种晶型。

The rare earth-aluminum-chromium-phosphate（ACP-La） was synthesized with aluminum hydroxide, chromic oxide, rare earth, methyl alcohol and phosphoric acid as original materials. The viscosity of the reaction system, moisture absorption rate, pH value, bonding strength and weight loss rate were monitored to control extent of the reaction. The TG-DSC, XRD and IR techniques were used to analyze the ACP-La properties. The experimental results showed that the best reaction conditions were： the original materials adding order being H3PO4, AI（OH）3, CrO3, La2O3 and CH3OH, the mole ratio of CrO3, AI（OH）3, H3PO4 and La203 being 1 ： 3 ： 9 ： 0.19, mass fraction of H3PO4 being 65%, reaction temperature being 140℃, reaction time being 1 h. The phase evolution of the rare system binder were as follows： amorphous phase in 200-975 ℃, A1PO4, Al（PO3）3 and Cr（PO3）3 in 975-1200 ℃