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Zhang J.,Jiangnan University | Ni Y.,Jiangnan University | Liu Q.-Q.,Jiangnan University | Ma W.-C.,Uonone Optoelectronics Technology Co. | Li L.-C.,Jiangsu Huasheng Tianlong Photoelectric Co.
Rengong Jingti Xuebao/Journal of Synthetic Crystals | Year: 2015

Numerical simulation of the temperature field in three-dimensional temperature gradient (3DGF) single crystal furnace by the finite element analysis method found that near the melt-crystal interface existed a large temperature gradient, which easily lead to crystal cracking; through improving crucible inner wall taper, adjusting the bottom heat shield structure and selecting the appropriate cooling program, good experimental results were achieved. The results show that a suitable temperature gradient and temperature programs can shorten the growth cycle and improve the quality of the crystal in the 3DGF sapphire crystal growth process. ©, 2015, Rengong Jingti Xuebao/Journal of Synthetic Crystals. All right reserved. Source


Yuan C.-L.,Jiangsu Huasheng Tianlong Photoelectric Co. | Li J.,Jiangsu Huasheng Tianlong Photoelectric Co. | Yu X.-D.,Trinity Material Co. | Shu T.-H.,Jiangsu Huasheng Tianlong Photoelectric Co. | And 4 more authors.
Rengong Jingti Xuebao/Journal of Synthetic Crystals | Year: 2012

This paper describes the new equipment, which can use the cold core to put the shoulder trace Czochralski method to growth of high-quality large-size sapphire crystal. Because of the crystal needs growth in high temperature, high vacuum, and the seed lift and rotate smooth, heavy precision crystal measured, steady state power supply environment, so we are equipped with vacuum chamber parts with a high cooling performance; High pumping speed, low anti-oil yield high vacuum system; Jitter-free, no crawling seed shaft (Commonly known as: Seed heat exchanger) lift and rotation system; High-precision, high-resolution weight sensing system; Stable and reliable electronic control systems and power heating systems to ensure the process of crystal growth. Experimental results show that: Simplify the system module design method not only improve the operating speed of the workers and simplified the operation steps, but also shorten the growth cycle and improved utilization of equipment. The excellent weight sensing system has a significant impact to the early stage of the seed growth; also play a significant role to solve the crystal whether to stick the crucible problem. The electronic control system for stability control of the heating power is one of the key factors to grow high quality large-size crystals. Source


Gong X.,Jiangnan University | Ni Y.,Jiangnan University | Si J.-L.,CAS Shanghai Institute of Optics and fine Mechanics | Li L.-C.,Jiangsu Huasheng Tianlong Photoelectric Co.
Rengong Jingti Xuebao/Journal of Synthetic Crystals | Year: 2015

Based on existing three-dimensional temperature gradient method (3DGF), a double crucible sapphire crystal growing furnace were designed. The three-dimension temperature gradient method of sapphire crystal growth furnace mainly aimed at the sapphire market, mobile phone panel designed to grow the crucible size, increased the utilization rate of materials, and simplify the crystal cutting process. We adopt double crucible technique, can further improve the production efficiency of crystal, save energy, reduce the cost. The design of the crucible 3-DGF sapphire crystal growth furnace can be single furnace by two 300 mm×100 mm×100 mm sapphire crystal. ©, 2015, Rengong Jingti Xuebao/Journal of Synthetic Crystals. All right reserved. Source


Li L.-C.,Jiangsu Huasheng Tianlong Photoelectric Co. | Feng J.-S.,Jiangsu Huasheng Tianlong Photoelectric Co.
Rengong Jingti Xuebao/Journal of Synthetic Crystals | Year: 2012

Through being developed for more than half a century, Al2O3 crystal has been widely used owing to a series of good physical and chemical properties such as high rigidity, high intensity, heat-resistance, corrosion-resistance, high light penetration, good insulation performance, etc. The great success has achieved in the research of Al2O3 crystal growth technique. Remarkable advances have been made in all kinds of growth technique, part of which have been extensively applied on an industrial scale. It has made enormous contribution on our light industry, national defence industry, aeronautics and astronautics, etc and also provided strong guarantee for rapid development of LED industry in recent years. Source

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