Mechanical properties and failure analysis of alumina-glass dental composites
Mechanical properties and failure analysis of alumina-glass dental composites
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DOI：
10.1111/j.1151-2916.1996.tb07994.x
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发表时间：
1996-07-01
影响因子：
3.9
通讯作者：
Francis, LF
中科院分区：
文献类型：
--
作者：
Wolf, WD;Vaidya, KJ;Francis, LF
强度测量和断口分析被用来研究氧化铝-玻璃牙科复合材料（含75体积%氧化铝和25体积%玻璃）的失效。通过注浆成型并在1100 ℃下烧结2小时来制备氧化铝压块。通过在1150 ℃下用玻璃渗透部分烧结的氧化铝8小时来制备致密的复合材料。复合材料的弹性模量和硬度分别为270 GPa和12 GPa。平均强度（460 MPa）和断裂韧性（4.0 MPa）。m（1/2））对玻璃热膨胀系数（α（玻璃）= 5.9 × 10（-6）~ 7.8 × 10（-6）℃-1）不敏感。由于氧化铝颗粒尺寸较小，复合材料的断裂韧性为单值，在压痕裂纹中观察到裂纹偏转和裂纹桥接现象氧化铝-玻璃复合材料是一种很有前途的新型陶瓷材料，因为它们的强度和断裂韧性比目前的牙科陶瓷的强度和断裂韧性大大约2倍。
Strength measurements and fractography were used to investigate the failure of alumina-glass dental composites containing 75 vol% alumina and 25 vol% glass. Alumina compacts were prepared by slip casting and sintering at 1100 degrees C for 2 h. Dense composites were made by infiltrating partially sintered alumina with glass at 1150 degrees C for 8 h. Young's modulus and the hardness of the composites were 270 GPa and 12 GPa, respectively. The mean strength (460 MPa) and fracture toughness (4.0 MPa . m(1/2)) of the composites were insensitive to the glass thermal expansion coefficient (alpha(glass) = 5.9 x 10(-6) to 7.8 x 10(-6) degrees C-1). Typical flaws mere pores and cracklike voids formed by poor particle packing and differential sintering near agglomerates of alumina in the composite, Crack deflection and crack bridging were observed in indentation cracks, Fracture toughness was single-valued because the alumina particle size was small (approximate to 3 mu m), Alumina-glass composites are promising new ceramics for dental crown and bridge applications, because their strength and fracture toughness are approximate to 2 times greater than those of current dental ceramics.