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Preparation of Leucite Powder with Controlled c-Phase fraction for a Variety of Dental Applications

机译:制备控制相态分数的白云母粉,可用于多种牙科应用

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摘要

Leucite (KAlSi_2O_6) is the main crystalline phase in feldspathic dental materials used for ceramic-fused-to-metal restorations. It occurs in two modifications, low temperature - tetragonal and at temperatures above 600℃ high temperature - cubic modification. Tetragonal leucite dispersed in a glassy matrix increases the thermal expansion coefficient a of the ceramics to a value that of metals (13-15.10~(-6) K~(-1)) and so enables its fusion to a metal substrate. However the difference in a of the matrix (6-8.10~(-6) K~(-1)) and t- leucite (20-25.10~(-6) K~(-1)) induces stress leading to the development of flaws in the dental porcelain. Submicron leucite crystals stabilized in cubic modification can reduce the number of crack deflections in porcelain and increase the flexural strange. The aim of this work was to develop a low-temperature preparation technology of submicron leucite powders with varying ratio of tetragonal and cubic modification. The results show that analcime synthesized in hydrothermal conditions is the suitable precursor for the preparation of leucite with controlled fraction of the c-modification. Homogenous t-leucite having particle size from 2-5 μm was prepared by 4h ion-exchange in 4M KCl. Partially stabilized c-leucite was obtained by dual ion-exchange; 4h in 4M CsCl led to 48 % of c-modification in the final product.
机译:白矾(KAlSi_2O_6)是用于陶瓷融合金属修复的长石型牙科材料中的主要结晶相。它以两种变体形式出现:低温-四方晶和高温-600℃以上的高温-立方晶。分散在玻璃状基质中的四方白云母可将陶瓷的热膨胀系数a增加到金属的热膨胀系数a(13-15.10〜(-6)K〜(-1)),从而使其能够熔融到金属基材上。然而,基质(6-8.10〜(-6)K〜(-1))和三水白榴石(20-25.10〜(-6)K〜(-1))的a差导致了应力的产生。牙齿瓷器的缺陷。立方改性的亚微米白云母晶体可以减少瓷器中的裂纹变形数量并增加弯曲变形。这项工作的目的是开发一种低温制备技术,该技术可以改变方形和立方晶比例的亚微米白云母粉。结果表明,在水热条件下合成的拟南芥是合适的前体,用于制备具有受控c改性率的白晶。通过在4M KCl中进行4h离子交换,制备了粒度为2-5μm的均相t-白云母。通过双离子交换获得部分稳定的c-白云母;在4M CsCl中放置4h,最终产物的c-改性率为48%。

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