Seed crystal hot pressing furnace

Our Products

■ 水平式

  • 工作温度:室温到500℃
  • 压力控制方式:配重块、气缸、丝缸传动

Our Innovation

New Process

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[One-step transfer] The process adopts a new crucible design of a porous graphite cylinder. The SiC material particles were placed between the crucible wall and the porous graphite cylinder. The whole crucible is deeper and bigger compared with the regular crucible. So we can put more materials and the evaporation area is bigger. This process solves the problem of crystal defects caused by the recrystallization of materials. The new process reduces the sensitivity of the temperature distribution in the material area to crystal growth, improves and stabilizes the transfer efficiency, and reduces the impact of carbon inclusions in the late growth period. [One-step transfer] without sticking seed crystal can be used to free thermal expansion, which is conducive to stress release. [One-step transfer] The process optimizes the hot zone and improves the efficiency of expanding.

*new process means [One-step transfer]

Axial and Radial Temp Control Separate

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[Axial and Radial Separation] is adopted by graphite furnace to solve the temperature coupling phenomenon of induction furnace. Adjust the axial temperature gradient to increase the crystal growth rate, but the radial temperature gradient will also be changed, which will lead to the change of the crystal growth surface, to increase of stress and crystal defects.
The graphite furnace heats up by different heating elements, it can separate control temp around the seed area and SiC particles material area .Then we can improve the growth rate when ensuring the crystal quality

Temp Control at Whole Cycle

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This technology solves the problem of accurate temperature measurement and control in the high-temperature environment above 2000 ° C.Normally we use infrared Thermometers . However, in the high-temperature environment, volatiles from graphite crucible and SiC particles materials will affect infrared thermometers data, so normally we control the power to estimate the temperature
We separate the crystal grow space and temperature measurement space .So we can control the real temperature when crystal growing,Impove the quality and stable of crystal

High Precision Pressure Control

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Pressure control is important for crystal growth. The pressure will affect the gas composition, gas flow uniformity, and crystal growth rate of SiC powder during sublimation.
The common pressure control accuracy is around ± 3Pa. We use our innovation pressure sensor match with a proportional valve to control pressure accuracy ± 0.3Pa (100-500Pa).

Double Coils Technology

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We control two coils separately ,one coil controls the temperature of the SiC powder material area and the other one control the temperature of the seed crystal area. The axial temperature gradient during crystal growth can be better controlled. After crystal growth is finished,we can control the temperature of the seed crystal area to do crystal annealing separately.

Heat Radiation Control

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We put an auto-run insulation shield above the graphite crucible. Then we can control the heat radiation by rotating the insulation shield.
The crystal growth interface moves downward during crystal growth, We can control the heat radiation to adjust the temperature of the seed crystal area without moving the Coil. Close the heat radiation when the crystal growth is completed to improve the quality of the SIC crystal.

Automive Control

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Design for Industry 4.0 factory

  1. Auto-run to load and unload the goods.
  2. Auto-run to level and position by itself.
  3. AGV+Charging system
  4. Laser navigation available.

*will launch soon

籽晶粘贴工艺是影响晶体生长的关键工艺之一,籽晶粘贴的品质将直接影响晶体生长的品质。恒普科技根据籽晶粘贴工艺的特性而研发了专门的辅助设备。其可以有效减少籽晶粘贴过程中产生的各种缺陷,从而提高籽晶粘贴的良率和晶体的最终品质。

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