Method of forming a single crystal sheet using a die having a thermal gradient along its length

  • US 9,926,645 B2
  • Filed: 04/17/2017
  • Issued: 03/27/2018
  • Est. Priority Date: 04/08/2004
  • Status: Active Grant
First Claim
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1. A method of forming a sapphire single crystal sheet, the method comprising providing a melt in a crucible having a die;

  • and drawing the sapphire single crystal sheet from the die, wherein the sapphire single crystal sheet has a length, a width, and a thickness, wherein the length>


    thickness, the width is not less than 15 cm, and the thickness is not less than 0.5 cm, and a thermal gradient along a length of the die is not greater than 0.6°


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