硫酸鈣之動力學硬化機制研究

A Studies Kinetics of Hardening Mechanism for Calcium Sulfate

許嘉麟(chia-lin hsu)

指導教授 ： 薛文景

國立臺北科技大學/工程學院/材料及資源工程系所/碩士(2006年)

摘要

本研究在半水硫酸鈣粉體上加入不同比例的水份，分別達到水與粉重量比為0.25、0.3、0.35、0.4之二水硫酸鈣的穩定相，再進行其機械性質與物理性質之量測，以探討其硬化之動力學機制。實驗中利用冷凍乾燥法作為反應觀察時間設定，由X-ray分析硫酸鈣穩定相之轉化率，觀察硫酸鈣穩定相之晶型成長。實驗結果得知若水份添加量愈少其轉化率愈快、機械強度愈強及溶解速率愈慢，轉化速率經演繹得知為三冪次方之反應而轉化後穩定二水硫酸鈣相之溶解速率係受硬化後之材料孔隙率大小影響，本研究並推論硫酸鈣硬化強度主要是晶型交錯成長及孔隙率影響。

關鍵字

半水硫酸鈣 ； 二水硫酸鈣 ； 水粉比

並列摘要

This study is trying to investigate mechanisms of the water addition to the hemi-hydrate calcium sulfate. Specimens with various weight ratios of water to powder are measured to examine theirs mechanical strength and corresponding dissolution properties. The conversion rates for phase transformation between calcium sulfates are observed by using freeze-drying method and X-ray diffraction analyzed method. The morphologies obtained from scanning electron microscopy (SEM) are also applied for the comparisons of the setting reactions. The results revealed that mechanical strength will be stronger with increasing conversion rate, where slower dissolution rate is obtained with less addition of water. The rate of phases converting is determined to be a third-order reaction, which is analyzed by comparing X-ray data and percentages of forming calcium sulfate into dihydrate state. Porosities between fibrous crystalline are found and deduced to be the main factors to affect the hardening strength of formed calcium sulfate dihydrate.

並列關鍵字

Calcium sulfate hemihydrate ； Calcium sulfate dihydrate ； liquid/powder weight ratio(L/P)

參考文獻

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