【摘要】：反應析晶燒結法是近年來制備玻璃陶瓷的一項新工藝,是將合成的析晶促進劑直接加入到玻璃粉中燒結,通過析晶促進劑與玻璃粉之間的化學反應析出微晶體,從而獲得玻璃陶瓷。該工藝不需要熔制特定組成的母相玻璃,適用范圍廣,燒結溫度較低,在資源循環(huán)利用、節(jié)能環(huán)保等方面具有顯著優(yōu)勢。本文以鈣鈉窗玻璃粉末為主要原料,分別加入氟云母、鈣鋁黃長石、頑輝石作為析晶促進劑,利用反應析晶法制備氟閃石、硅灰石及透輝石玻璃陶瓷�？疾煳鼍Т龠M劑添加量、燒結溫度、保溫時間對玻璃陶瓷組織形貌、晶相組成和力學性質(zhì)的影響。研究反應析晶過程中鈣鋁黃長石-硅灰石、氟云母-氟閃石、頑輝石-透輝石的轉變機理。研究結果表明:以鈣鋁黃長石為析晶促進劑,鈣鋁黃長石的最佳加入量是20%,950℃燒結2h后硅灰石玻璃陶瓷達到最佳性能,維氏硬度值高達3.2GPa。保溫過程中,鈣鋁黃長石中的鋁元素擴散到玻璃相,從而轉變成硅灰石。以氟云母為析晶促進劑,最佳加入量是30%,950℃保溫2h后的氟閃石玻璃陶瓷性能最佳,維氏硬度值為1.5GPa。不同保溫時間影響晶相種類:等溫0-2h,氟云母與玻璃的反應生成氟閃石;等溫3h期間,氟云母與玻璃反應生成透輝石;保溫4h,析出的透輝石與玻璃相反應生成氟閃石。以頑輝石為析晶促進劑,最佳加入量為30%,900℃燒結3h后透輝石玻璃陶瓷性能最佳,維氏硬度值為1.7GPa。等溫過程中頑輝石先與玻璃熔體反應生成透長石,再生成透輝石晶體。
[Abstract]:Reactive crystallization sintering is a new process for preparing glass ceramics in recent years. The synthesized crystallization accelerator is added directly to glass powder and microcrystals are precipitated by chemical reaction between glass powder and crystallization accelerator. In order to obtain glass ceramics. The process does not need to melt the parent phase glass with specific composition. It has a wide range of application and low sintering temperature. It has obvious advantages in resource recycling, energy saving and environmental protection. In this paper, perovskite, wollastonite and diopside glass ceramics were prepared by reactive crystallization using perovskite, perovskite and pyroxene as crystallization promoters with perovskite as the main raw material and perovskite as the main raw material. The effects of the amount of crystallization accelerator, sintering temperature and holding time on the microstructure, phase composition and mechanical properties of glass ceramics were investigated. The transformation mechanism of peraluminous feldspar-wollastonite fluormica-flumblende and enclave-diopside during crystallization was studied. The results show that the best addition amount of aluminofeldspar is 20%, and the properties of wollastonite glass ceramics sintered at 950 鈩，

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