氟磷灰石掺杂二硅酸锂微晶玻璃

Fluorapatite-doped Lithium Disilicate Glass-Ceramics

采用烧结法制备含有不同质量分数氟磷灰石（FAP）的二硅酸锂（LD）微晶玻璃,研究了不同质量分数的氟磷灰石对二硅酸锂微晶玻璃物相、显微结构、抗压强度及显微硬度的影响。结果表明：样品的主晶相为LD和FAP,LD晶体均呈棒状,交错排列,形成互锁显微结构。随着FAP质量分数的增加,LD晶体长大,晶体的数量减少,长径比增大,样品的抗压强度先增大后减小,显微硬度逐渐增大。当FAP含量为20%时,晶粒分布均匀,长径比适中,具有优良的互锁结构;其抗压强度和显微硬度分别为737 MPa和676,可用于牙齿修复材料。

The lithium disilicate（LD, Li2Si2O5） glass-ceramic with different mass fractions of fluorapatite（FAP, Ca5（PO4）3F） was prepared by a sintering method. The effect of fluorapatite content on the crystalline phase, microstructure, compression strength and microhardness of the LD glass-ceramics was investigated by X-ray diffraction, energy dispersive X-ray spectroscopy, scanning electronic microscopy, universal testing machine measurement and microhardness test, respectively. The results show that LD and FAP are the main crystalline phases in all the sintered glass-ceramics with the FAP percentages from 20% to 50%. The LD crystal is rod-like, closely packed and multi-directionally interlocked. The LD size increases, the LD amount decreases, the aspect ratio of the LD crystals increases and the crystal distribution becomes sparser when the FAP mass fraction increases. Under the same condition, the compressive strength of the glass-ceramics first increases and then decreases, but the microhardness gradually increases. When the FAP content is 20%, the samples possess uniform grain size, appropriate aspect ratio and excellent interlocking structure. The compressive strength and the microhardness of the samples are 737 MPa and 676, respectively, which can be used as dental restoration materials.