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Shrinkage and strength characterization of an alumina-glass interpenetrating phase composite for dental use

机译：牙科用氧化铝-玻璃互穿相复合材料的收缩率和强度表征

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Objective. The aim of the study was to investigate the influence of temperature and time during partial-sintering (i.e. initial-stage sintering) on the shrinkage and strength of an alumina-glass dental composite.rnMethods. The alumina slip and infiltrating glass were prepared for fabrication of an interpenetrating phase composite by melt-infiltration technology. Partial-sintering temperatures for the alumina body ranged from 1050 to 1200℃ (2h) and at 1125℃, the time was varied from 2 to 8h. Partially sintered alumina preforms were then infiltrated with melted glass at 1125℃ for 6 h except for one group treated at 1100℃ for 6 h.rnResult. The composite demonstrated shrinkage not only during initial-stage sintering of the alumina but also during infiltration of glass into the alumina preform. Higher temperatures and longer times for alumina sintering led to greater shrinkage for the alumina preform and overall for the alumina-glass infiltrated composite. However, shrinkage during the infiltration stage was lower for alumina compacts having the highest initial-stage sintering shrinkage (1200℃ for 2 h or at 1125℃ for 6 and 8 h). Strength of the composite was not influenced when sintering temperatures and times were increased. Significance. Shrinkage during both alumina sintering and glass infiltration must be taken into account for the overall shrinkage of the alumina-glass interpenetrating phase composite. Strength does not appear to be influenced by the changes in density or preform microstructure occurring during more extensive initial-stage sintering.
机译：目的。该研究的目的是研究部分烧结（即初始烧结）期间的温度和时间对氧化铝-玻璃牙科复合材料的收缩率和强度的影响。制备了氧化铝浆料和渗透玻璃，用于通过熔体渗透技术制造互穿相复合材料。氧化铝体的部分烧结温度为1050至1200℃（2h），而在1125℃，时间为2至8h。然后将部分烧结的氧化铝预成型坯在1125℃下用熔融玻璃渗透6 h，除了一组在1100℃下处理6 h。结果。该复合材料不仅在氧化铝的初始烧结期间显示出收缩，而且在玻璃渗透到氧化铝预成型件中时也显示出收缩。较高的温度和较长的氧化铝烧结时间导致氧化铝预成型件以及整个氧化铝-玻璃渗透复合材料的更大收缩。然而，对于具有最高初始烧结收缩率的氧化铝压块（1200℃2 h或1125℃6和8 h），在渗透阶段的收缩较低。当烧结温度和时间增加时，复合材料的强度不受影响。意义。氧化铝-玻璃互穿相复合材料的整体收缩率必须考虑到氧化铝烧结和玻璃渗透过程中的收缩率。强度似乎不受更广泛的初始烧结过程中发生的密度或预成型坯微观结构变化的影响。

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