废玻璃粉制备玻璃陶瓷及反应析晶机理研究
发布时间：2019-04-12 19:53
【摘要】：反应析晶烧结法是近年来制备玻璃陶瓷的一项新工艺,是将合成的析晶促进剂直接加入到玻璃粉中烧结,通过析晶促进剂与玻璃粉之间的化学反应析出微晶体,从而获得玻璃陶瓷。该工艺不需要熔制特定组成的母相玻璃,适用范围广,烧结温度较低,在资源循环利用、节能环保等方面具有显著优势。本文以钙钠窗玻璃粉末为主要原料,分别加入氟云母、钙铝黄长石、顽辉石作为析晶促进剂,利用反应析晶法制备氟闪石、硅灰石及透辉石玻璃陶瓷。考察析晶促进剂添加量、烧结温度、保温时间对玻璃陶瓷组织形貌、晶相组成和力学性质的影响。研究反应析晶过程中钙铝黄长石-硅灰石、氟云母-氟闪石、顽辉石-透辉石的转变机理。研究结果表明:以钙铝黄长石为析晶促进剂,钙铝黄长石的最佳加入量是20%,950℃烧结2h后硅灰石玻璃陶瓷达到最佳性能,维氏硬度值高达3.2GPa。保温过程中,钙铝黄长石中的铝元素扩散到玻璃相,从而转变成硅灰石。以氟云母为析晶促进剂,最佳加入量是30%,950℃保温2h后的氟闪石玻璃陶瓷性能最佳,维氏硬度值为1.5GPa。不同保温时间影响晶相种类:等温0-2h,氟云母与玻璃的反应生成氟闪石;等温3h期间,氟云母与玻璃反应生成透辉石;保温4h,析出的透辉石与玻璃相反应生成氟闪石。以顽辉石为析晶促进剂,最佳加入量为30%,900℃烧结3h后透辉石玻璃陶瓷性能最佳,维氏硬度值为1.7GPa。等温过程中顽辉石先与玻璃熔体反应生成透长石,再生成透辉石晶体。
[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，
本文编号：2457344
[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，
本文编号：2457344
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