Research On Technology Of Preparation Nano-composite High Temperature And Good Resistance To Heat Shock Ceramic

Current use of thermocouple protection tube quench resistance urgent hot sex differences, very easy to be broken, loss expensive thermocouples, also leads to the production cannot proceed, give companies enormous losses. To solve this problem, the subject using lower prices for matrix, through to the alumina in matrix add zirconia and cordierite, use dry pressing molding, atmospheric sinter method is prepared, good resistance to heat shock ceramics. Using the ceramic made it into the high-temperature thermocouple protection tube, can make its thermal shock resistance and service life is greatly increased, for enterprise's actual production bring a lot of convenience.This experiment process:join nano ceramic powder into anhydrous alcohol, ultrasonic vibration, with a certain proportion of PVB mixed, then add anhydrous alcohol to PVB mixed colloid, reuse blender for mixing, to make all kinds of powder mixed evenly, again will be dispersed evenly powder through the dry, dry pressing molding, platoon plastic, sintering technics, preparation into good resistance to heat shock ceramics.This experiment with the matrix of nanometer alumina in matrix to join in the lower linear expansion coefficient, join inhibit grain material SiC abnormal grew up, reduce material MgO style sintering temperature of the material join TiO2, Sintering using atmospheric sinter, sintering temperature in 1500～1700℃between, and preparation of ceramic materials into good resistance to heat shock.This topic through in alumina matrix method of adding zirconia ceramics preparation good resistance to heat shock, improves the alumina ceramic thermal shock resistance, the research of this aspect in both at home and abroad was very rare. Therefore this paper discusses the good resistance to heat shock ceramic preparation processes, including thermal shock ceramic composition design, sintering process, etc. Through good resistance to heat shock experiments, eventually do ceramics has very good thermal shock resistance. This paper XRD samples phase composition analysis, testing samples cordierite the phase composition, SEM of ceramic organize structure analysis, from microcosmic Angle analysis of nano SiC, ZrO2 distribution and against thermal shock effect, and inhibit grain abnormal grew up MgO style role. Through the experiment and analysis, the present achieves success, getting the best project of composition design and the technique of sintering of thermal shock resistant ceramics.