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Korean Journal of Metals and Materials > Volume 55(1); 2017 > Article
Korean Journal of Metals and Materials 2017;55(1): 60-66. doi: https://doi.org/10.3365/KJMM.2017.55.1.60
저항가열 초크랄스키법에 의한 야그 단결정 성장의 전산모사 연구
유명현, 차필령
국민대학교 신소재공학부
Numerical Simulation of Yttrium Aluminum Garnet(YAG) Single Crystal Growth by Resistance Heating Czochralski(CZ) Method
Myeong Hyeon You, Pil Ryung Cha
School of Advanced Materials Engineering, Kookmin University, Seoul 02707, Republic of Korea
Correspondence  Pil Ryung Cha ,Tel: +82-2-910-4656, Email: cprdream@kookmin.ac.kr
Received: 22 April 2016;  Accepted: 29 June 2016.  Published online: 5 January 2017.
ABSTRACT
Yttrium Aluminum Garnet (YAG) single crystal has received much attention as the high power solid-state laser’s key component in industrial and medical applications. Various growth methods have been proposed, and currently the induction-heating Czochralski (IHCZ) growth method is mainly used to grow YAG single crystal. Due to the intrinsic properties of the IHCZ method, however, the solid/liquid interface has a downward convex shape and a sharp tip at the center, which causes a core defect and reduces productivity. To produce YAG single crystals with both excellent quality and higher yield, it is essential to control the core defects. In this study, using computer simulations we demonstrate that the resistance-heating CZ (RHCZ) method may avoid a downward convex interface and produce core defect free YAG single crystal. We studied the effects of various design parameters on the interface shape and found that there was an optimum combination of design parameter and operating conditions that produced a flat solid-liquid interface.
Keywords: implant, titanium alloy, low elastic modulus, direct aging, microstructure, mechanical properties
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