CAJ | 학술논문

为研究陶瓷在热压烧结炉内温度场的动态分布规律,选用直径400 mm sialon陶瓷为研究对象,采用有限元辐射计算方法研究了加热速率、压头端面温度、隔热套筒高度对热压炉内温度场分布的影响.结果表明:在加热初始阶段,试样心部与边缘的温差随升温速率提高而增大,而在加热后期,随着升温时间增加,试样心部与边缘的温差逐渐减小,并稳定在17℃;样品区达到稳定温度所需时间随升温速率增加而减小;增大隔热套筒与模具之间的距离、增加石墨垫块与水冷压头之间的热阻均有利于提高样品区温度场的均匀性;样品区温度随其距中心距离增加而增大,并沿径向呈抛物线形分布.
위연구도자재열압소결로내온도장적동태분포규률,선용직경400 mm sialon도자위연구대상,채용유한원복사계산방법연구료가열속솔、압두단면온도、격열투통고도대열압로내온도장분포적영향.결과표명:재가열초시계단,시양심부여변연적온차수승온속솔제고이증대,이재가열후기,수착승온시간증가,시양심부여변연적온차축점감소,병은정재17℃;양품구체도은정온도소수시간수승온속솔증가이감소;증대격열투통여모구지간적거리、증가석묵점괴여수냉압두지간적열조균유리우제고양품구온도장적균균성;양품구온도수기거중심거리증가이증대,병연경향정포물선형분포.
To understand temperature fields dynamic distribution in hot press sintering furnace, the sialon ceramics (0400 mm) sample was selected and finite element method (FEM) was used to analyze the effects of heating rate, temprerature at top surface pressure head and the height of insulation sleeve on temperature fields dynamic distribution in hot press sintering furnace. Results show that the temperature difference between center and edge of sample increases with heating rate increasing during the starting stage, however, during the final stage, the temperature difference decreases gradually with the heating time increasing, and it stabilizes by 17 ℃ . The time of sample reaching stabilized temperature decreases with the heating rate increasing. Increasing the distance between the thermal insulation sleeve and mould, and increasing the thermoresistance between graphite block and cooling head all would contribute to increase the uniformity of temperature of sample, the emperature of sample increases from the center point, and its distribution curve is parabolic radially.