CAJ | 학술논문

以MgO、Al2O3及SiO2为原料,研究了四氯化钛添加量对合成堇青石陶瓷材料热膨胀系数的影响.研究表明,适量四氯化钛能够促使堇青石晶体由低温型的β-堇青石晶相向更低热膨胀系数的高温型α-堇青石(印度石)晶相转变,从而在一定程度上降低堇青石陶瓷材料的热膨胀系数,但其添加量不宜超过5.0wt.%,否则将导致尖晶石与假蓝宝石晶相的生成而致使热膨胀系数显著升高.当四氯化钛的添加量为4.0wt.%、烧结温度为1430 ℃时,可以获得室温至800 ℃平均热膨胀系数为1.16×10-6 ℃-1的堇青石陶瓷材料.
이MgO、Al2O3급SiO2위원료,연구료사록화태첨가량대합성근청석도자재료열팽창계수적영향.연구표명,괄량사록화태능구촉사근청석정체유저온형적β-근청석정상향경저열팽창계수적고온형α-근청석(인도석)정상전변,종이재일정정도상강저근청석도자재료적열팽창계수,단기첨가량불의초과5.0wt.%,부칙장도치첨정석여가람보석정상적생성이치사열팽창계수현저승고.당사록화태적첨가량위4.0wt.%、소결온도위1430 ℃시,가이획득실온지800 ℃평균열팽창계수위1.16×10-6 ℃-1적근청석도자재료.
Serials of cordierite ceramics were synthesized by solid phase sintering method using MgO,Al2O3 and SiO2 as raw materials and TiCl4 as an additive. The effects of TiCl4 added on the thermal expansion coefficient of cordierite ceramics were investigated. The results show that an appropriate amount of TiCl4 (1.0-5.0wt %) can promote the phase transition from β-cordierite to α-cordierite (indialite) with a lower coefficient of thermal expansion. However,excessive TiCl4 (>5.0 wt.%) will lead to the generation of crystals of spinel and sapphire phase,which results in the significant increasing of the thermal expansion coefficient. When the added amount of TiCl4 is 4.0 wt.% and the sintering temperature is 1430℃,the cordierite ceramic material with the thermal expansion coefficient of 1.16× 10-6℃-1 (25-800℃) can be obtained.