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发明公开
CN103311426A 用制冷晶棒加工废料制备N型Bi2Te3基热电材料的方法 有权 质押 转让

用制冷晶棒加工废料制备N型Bi2Te3基热电材料的方法
摘要：
本发明涉及一种用制冷晶棒加工废料制备N型Bi2Te3基热电材料的方法。其技术方案是：先将制冷晶棒的加工废料研磨，洗涤，烘干；将烘干后的粉末置入气体还原炉内，通入还原气体与惰性气体的混合气体，再将气体还原炉升温至200～550℃，保温1.0～5.0h，降温至室温，即得脱除杂质的制冷晶棒加工废料。然后将其放入石英管内，按N型Bi2Te3基热电材料的化学式（BixSb2-xTe3-ySey，其中1.5≤x≤2.0，0.1≤y≤0.7）添加纯度大于99.9wt%的Bi、Te、Sb和Se原料。最后对石英管抽真空封装，放入加热炉内熔炼，熔炼温度为580～850℃，保温0.5～5.0h，随炉冷却，取出石英管内的合金锭，即得N型Bi2Te3基热电材料。本发明具有工艺简单、回收周期短、环境污染小和成本低的特点。
摘要（英）：

The invention relates to a method for preparing N-type Bi2Te3 based thermoelectric materials by refrigeration crystal bar processing waste. The technical scheme includes that firstly, the refrigeration crystal bar processing waste is grinded, washed and dried, secondly, dried powder is placed into a gas reduction furnace, mixed gas of reducing gas and inert gas is led in, the gas reduction furnace is heated up to reach 200-550 DEG C, the temperature is kept for 1.0-5.0h and is reduced to room temperature, and the refrigeration crystal bar processing waste with impurities removed is obtained. The refrigeration crystal bar processing waste with the impurities removed is placed into a quartz tube, and according to the chemical formula (BixSb2-xTe3-ySey, wherein 1.5<=x<=2.0 and 0.1<=y<=0.7) of the N-type Bi2Te3 based thermoelectric materials, Bi, Te, Sb and Se raw materials with purity higher than 99.9wt% are added. Finally, the quartz tube is packaged in an evacuated manner and is smelted in a heating furnace at the temperature of 580-850 DEG C, the temperature is kept for 0.5-5.0h, the quartz tube is cooled along with the furnace, and an alloy ingot in the quartz tube is taken out, so that the N-type Bi2Te3 based thermoelectric materials are obtained. The method has the advantages of simple process, short recovery cycle, less environmental pollution and low cost.

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