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

doi:10.3724/SP.J.1077.2013.12149

Journal of Inorganic Materials ›› 2013, Vol. 28 ›› Issue (3): 307-311.DOI: 10.3724/SP.J.1077.2013.12149

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

HU Ke-Yan^1,2, XU Jun², TANG Hui-Li², LI Hong-Jun², ZOU Yu-Qi², YANG Qiu-Hong¹

(1. Department of Electronic Imformation Materials, Shanghai University, Shanghai 200072, China; 2. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201800, China)

Received:2012-03-07 Revised:2012-07-09 Published:2013-03-20 Online:2013-02-20
About author:HU Ke-Yan. E-mail: Hukeyan123@126.com
Supported by:
Shanghai Science and Technology Commission (10ZR1434200); National Natural Science Foundation of China (61177037)

Abstract

Abstract: Mechanical 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 5×10^-3, the fracture strength and fracture toughness were increased to 752 MPa and 2.81 MPa·m1/2 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.

Key words: sapphire crystal, carbon doped, mechanical properties, temperature gradient technique (TGT)

CLC Number:

TG174

HU Ke-Yan, XU Jun, TANG Hui-Li, LI Hong-Jun, ZOU Yu-Qi, YANG Qiu-Hong. Study on Methods to Strenthen and Toughen Sapphire Crystal by Carbon Doped Grown by Temperature Gradient Technique (TGT)[J]. Journal of Inorganic Materials, 2013, 28(3): 307-311.

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

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