Research Of High Temperature Fireproof Coat-Preparation Of High Temperature Insulative Coat By Sol-Gel Process

A special fireproof dope were studied, which provide a insulation for the wire at high temperature, so that it can bestow a protection of the metal wire, and enhance the life of the wire. The material uses TEOS, inorganic salt as the precursor, high temperature resistance insulative paints were prepared by Sol-Gel process, and Cr2O3were put into the material, then three kind of samples without Cr2O3, with20%Cr2O3and with40%Cr2O3will be got after treated at the temperature of600℃、800℃、1000℃.By the DTA test of the sample, we can prepare the sintered curve; By analysis of the IR curve to confirm the radical component of the gelatin we have got; Phase composition can be confirmed through the XRD analysis; The TGA curve can reflect the change of the sample during the sintered process; before an after the heat treatment use the SEM test to exam the surface morphology of the sample and membrane structure when coating; According to the weightlessness curve, resistance to high temperature of the sample can be proved; According to the insulated capability curve, insulated capability of the sample can be researched.By analysis experimental data, draw out the optimum preparation technology of the sample:The one with20%Cr2O3is merely9%when sintered at1000℃, and the insulated capability can reach57.71×109Ω·cm. This fireproof dope shows a superior ability of high temperature resistance insulative when works at the temperature50℃-250℃.