Desenvolvimento de um dispositivo para obtenção de monocristais de ligas à base de cobre

Abstract

Recebido em 25/6/02; aceito em 31/3/03 DEVELOPMENT OF A DEVICE FOR OBTAINING SINGLE CRYSTALS OF COPPER-BASED ALLOYS. This paper describes the drawing, construction and optimization of a device, which can be used to obtain single crystals of different metallic materials with melting point from 550 to 1050 o C. Components of ease obtaining and of low cost were used. The device was based on the modified Bridgman technique and it was used to obtain single crystals of copper-based alloys. The temperature axial profiles and a difference less then 1% in the temperature between the wall and the center of the ceramic tube in the critical region for obtaining single crystals of good quality indicated that the oven presents a good thermal stability. Single crystals of CuZnAl and CuAlAg alloys of good quality were growth and characterized using optical microscopy and Laüe X-ray back reflection.