温梯法生长掺碳强韧化蓝宝石单晶的研究  

Study on Methods to Strenthen and Toughen Sapphire Crystal by Carbon Doped Grown by Temperature Gradient Technique (TGT)

作　　者：胡克艳[1,2] 徐军[2] 唐慧丽[2] 李红军[2] 邹宇琦[2] 杨秋红[1] 

机构地区：[1]上海大学电子信息材料系,上海200072 [2]中国科学院上海硅酸盐研究所,上海201800

出　　处：《无机材料学报》2013年第3期307-311,共5页Journal of Inorganic Materials

基　　金：上海市科学技术委员会(10ZR1434200);国家自然科学基金(61177037)~~

摘　　要：研究了温梯法生长不同浓度石墨碳掺杂蓝宝石单晶的室温力学性能。实验发现在蓝宝石单晶中,掺入适量石墨碳可以显著提高晶体常温断裂强度和断裂韧性,而不损害晶体的可见和近红外透过性能。当其掺入的石墨浓度为5×10-3时,蓝宝石单晶的断裂强度和断裂韧性平均分别提高到752 MPa和2.81 MPa.m1/2,而其可见和近红外透过率依然达80%。掺杂的石墨碳在蓝宝石晶体中部分作为晶格间隙离子,对蓝宝石单晶的开裂具有钉扎作用,达到提高蓝宝石单晶常温力学性能的效果。但是过量石墨碳的掺杂会引起掺质的组分偏析,晶体中出现碳包裹物,从而导致晶体力学性能和光学性能的下降。Mechanica/ properties of carbon-doped sapphire crystals with different carbon concentrations were studied at room temperature. The present work showed that the fracture strength and fracture toughness of as grown crystals were significantly improved by carbon doping and the visible-infrared optical property did not adversely affect. When the concentration of doped carbon was 5xl03, the fracture strength and fracture toughness were increased to 752 MPa and 2.81 MPa.m2/2 in average, respectively, and the transmition of visible-infrared was about 80%. Appropriate carbon dopant in the crystals played the roles of clearance ions and created blocking effect to the sapphires cracking, which improved fracture strength and fracture toughness of sapphires at room temperature. However the mechanical properties and optical properties declined when carbon dopant was excessive, due to carbon inclusions grown from composition segregation.

关 键 词：蓝宝石单晶 强韧化 掺碳 温梯法 

分 类 号：TG174[金属学及工艺—金属表面处理]