| How should a corundum crucible be used |
| [ Publish: 2018-11-27 ] |
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Want to know how to use a corundum crucible? Today, small make up according to my experience to give you a detailed introduction, I hope to help you, welcome everyone to exchange: 1.The temperature difference is too big. Heat insulation plugs (two on each side) are placed in the corundum crucible for use between the hot and cold areas. 2.TAt such a high temperature, the middle of the pipe is relatively soft, so the pipe is prone to deformation and fracture compared with the corundum crucible. It is recommended to add brackets on both sides of the pipe 3.TThe other thing is that the newly bought tubes have to be baked several times at different temperatures before we can use the newly bought corundum crucible here. At 200 ℃, 1000 ℃ general insulation for 1 hour. 4. Suggest a speed not too fast, don't silicon carbide furnace tube more than 140 ℃ / h, warming fastest fastest speed limit 10 ℃ / min pay particular attention to the cooling corundum crucible! Best heating rate shall not be higher than 10 ℃ / min, the cooling rate should be below 10 ℃ / min bracket can reduce deformation, fracture. The red arrow is gravity and the blue arrow is support. 5. Except for the bracket problem above; Also, inside the tube furnace burning samples, especially the sample to burn to about 1300 ℃, the best water content less (refers to water content, water adsorption, water of crystallization, etc., may be generated in the process of heating water); It is suggested that your samples should be pre-burned before being put into the tubular furnace. It is better not to sample or add samples at high temperature, which is likely to damage the furnace tube of the corundum crucible. 6. Shall not touch strong corundum crucible at 300 ℃ to 900 ℃ heat preservation shall not touch the high temperature furnace tube with low temperature object |
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