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Ultrasonic Properties of Calcium Phosphate Glasses and Glass-Ceramics

磷酸钙玻璃和微晶玻璃的超声性能

基本信息

批准号：
06650754
负责人：
KODAMA Masao
金额：
$ 1.15万
依托单位：
Kumamoto Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

项目摘要

[Objective] The purpose of the present research is to measure ultrasonic properties of calcium phosphate glasses and glass-ceramics and to elucidate the elastic properties of these bioceramics.[Experimental] Calcium phosphate glasses, xCaO・ (1-x) P_2O_5, were made in the composition range x=0.25-0.50. First, required amounts of H_3PO_4 and CaCO_3 were made to react in an aqueous solution in a beaker made of poly (tetrafluoroethylene) and after evaporation of the water a chemically reacted powder was obtained. The powder was fused in an alumina crucible at a temperature of 1300ﾟC for 2h. Then the liquid was poured into a graphite mold which had been preheated at 300ﾟC and cooled at a rate of 1K/min to room temperature to form a cylindrical bulk glass. The glass transition temperature and the crystallization temperature for the glass of each composition were determined by differential thermal analysis. After each bulk glass had been annealed at the glass transition temperature, the ultrasonic properties were measured. Moreover, each bulk glass was crystallized at the crystallization temperature and the ultrasonic properties of the glass-ceramics were also measured. In order to measure the ultrasonic velocity with high accuracy, the ultrasonic pulseecho overlap method was refined during the present research. It was ascertained that ultrasonic velocity can be measured within an error of 0.02% by use of a silica glass as the standard specimen.[Results and Discussion] For these glasses and glass-ceramics, the following physical properties were measured : ultrasonic velocity, ultrasonic absorption coefficient, temperature coefficient of ultrasonic travel time, density, and thermal expansion. Especially, from the density and the ultrasonic velocity, elastic constants such as Young's modulus, rigidity modulus, bulk modulus, Poisson's ratio, and acoustic impedance were evaluated, from which the elastic properties of these bioceramics were elucidated.

[目的]研究钙磷玻璃和微晶玻璃的超声性能，并探讨其弹性性能。[实验]在x=0.25-0.50的组成范围内制备了磷酸钙玻璃xCaO·（1-x）P_2O_5。首先，使所需量的H_3PO_4和CaCO_3在由聚碳酸酯制成的烧杯中的水溶液中反应，并在蒸发水后获得化学反应粉末。将粉末在氧化铝坩埚中在1300 ° C的温度下熔融2小时。然后将液体倒入已经在300 ° C下预热并以1 K/min的速率冷却至室温的石墨模具中，以形成圆柱形块状玻璃。通过差热分析确定每种组成的玻璃的玻璃化转变温度和结晶温度。在每个块体玻璃在玻璃化转变温度下退火后，测量超声性质。此外，在晶化温度下对各块体玻璃进行了晶化，并对微晶玻璃的超声性能进行了测试。为了高精度地测量超声声速，本文对超声脉冲回波重叠法进行了改进。确定了用石英玻璃作为标准样品，可以测量超声波速度，误差在0.02%以内。[结果与讨论]测定了这些玻璃和微晶玻璃的超声波速度、超声波吸收系数、超声波传播时间的温度系数、密度、热膨胀等物性。特别是，从密度和超声波速度，弹性常数，如杨氏模量，刚性模量，体积模量，泊松比，和声阻抗进行了评估，从这些生物陶瓷的弹性性能阐明。