High-performance, reaction sintered lithium disilicate glass-ceramics
High-performance, reaction sintered lithium disilicate glass-ceramics
复制标题
高性能反应烧结二硅酸锂玻璃陶瓷
DOI：
10.1016/j.ceramint.2014.04.096
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发表时间：
2014-09-01
影响因子：
5.2
通讯作者：
Yang, Jian-Feng
中科院分区：
文献类型：
--
作者：
Zhao, Ting;Qin, Yi;Yang, Jian-Feng
采用反应烧结结合热压工艺制备了高强度、高硬度、高断裂韧性的Li 2Si 2 O 5微晶玻璃。Li 2SiO 3晶体、SiO2和Li 2Si 2 O 5玻璃用作起始粉末。结果表明，通过Li 2SiO 3晶体与SiO2玻璃之间的相互作用，可以得到长度达数十微米的棒状Li 2Si 2 O 5晶体，其长度是直接从Li 2Si 2 O 5母体玻璃中结晶出来的Li 2Si 2 O 5晶体的数倍。通过调节Li 2Si 2 O 5玻璃含量，Li 2Si 2 O 5微晶玻璃呈现出由反应过程中形成的大尺寸细长Li 2Si 2 O 5晶粒和较小的Li 2Si 2 O 5玻璃粉末析出物组成的双峰分布，且微观结构更加致密。虽然结晶度随着Li 2Si 2 O 5玻璃含量的增加而降低，但是Li 2Si 2 O 5玻璃-陶瓷表现出高的弯曲强度（350 +/- 13 MPa）、高的硬度（5.92 +/- 0.18 GPa）和断裂韧性（3.3 +/- 0.14 MPa m（1/2））。(C)2014 Elsevier Ltd和Techna Group S.r.l. All rights reserved.
A novel method of reaction sintering combined with hot-pressing technology was developed to prepare Li2Si2O5 glass-ceramics with high flexural strength, hardness and fracture toughness. Li2SiO3 crystal, SiO2 and Li2Si2O5 glass were used as the starting powders. The results show that via an interaction between Li2SiO3 crystals and SiO2 glass, rod-like Li2Si2O5 crystals with length of up to tens microns could be obtained, which were several times longer than those directly crystallized from the Li2Si2O5 parent glass. Through adjusting the Li2Si2O5 glass content, Li2Si2O5 glass-ceramics displayed a denser microstructure with the bimodal distribution consisting of large elongated Li2Si2O5 grains formed during the reaction and smaller precipitates of the Li2Si2O5 glass powder. Although the crystallinity decreased with increasing the Li2Si2O5 glass content, the Li2Si2O5 glass-ceramics exhibited high flexural strength (350 +/- 13 MPa), high hardness (5.92 +/- 0.18 GPa) and fracture toughness (3.3 +/- 0.14 MPa m(1/2)). (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.