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Method for preparing magnesium silicide thermoelectric material block and thermoelectric material block
The invention belongs to the field of thermoelectric material preparation, and provides a method for preparing a magnesium silicide thermoelectric material block and the thermoelectric material block, and the method comprises the following steps: S1, weighing raw materials: weighing high-purity Mg powder and S < i > powder according to the ratio of various material coefficients in a chemical equation; s2, doping and mixing are conducted, Bi powder is weighed, the content of the Bi powder accounts for 1.5% (mole fraction) of the Mg powder and the S i powder, the Mg powder, the S i powder and the Bi powder are fully mixed, and a mixed powder material is obtained; s3, magnesium silicide is prepared through a spark plasma sintering method, the mixed powder material is put into a high-strength graphite mold for current activation, and the mixed powder material is subjected to current activation through two electrodes installed on the upper portion and the lower portion of the mold; s4, shaping deformation is conducted, specifically, under the high-temperature condition, the mixed powder material is subjected to pressure sintering through two die punches installed on the upper portion and the lower portion of a die; after the thermoelectric material block is doped with the Bi powder, the thermoelectric performance of the thermoelectric material block is remarkably improved, and the economic effect is better.
本发明属于热电材料制备领域，提供了一种制备硅化镁热电材料块体的方法及热电材料块体，包括以下步骤：S1、原料称量，通过化学方程式中各个物质系数之比称量高纯的Mg粉和S i粉；S2、掺杂混合，称量Bi粉，Bi粉含量为Mg粉和S i粉的1.5％(摩尔分数)，将Mg粉、S i粉和Bi粉充分混合，得到混合粉体材料；S3、通过放电等离子烧结法制备硅化镁，将混合粉体材料放入高强度石墨模具内部进行电流激活，通过安装在模具上下的两个电极对混合粉体材料进行电流激活；S4、塑形变形，在高温条件下，通过安装在模具上下的两个模冲对混合粉体材料进行加压烧结；本发明制成的热电材料块体掺杂B i粉末后，其自身的热电性能显著提高，所带来的经济效应更好。
Method for preparing magnesium silicide thermoelectric material block and thermoelectric material block
The invention belongs to the field of thermoelectric material preparation, and provides a method for preparing a magnesium silicide thermoelectric material block and the thermoelectric material block, and the method comprises the following steps: S1, weighing raw materials: weighing high-purity Mg powder and S < i > powder according to the ratio of various material coefficients in a chemical equation; s2, doping and mixing are conducted, Bi powder is weighed, the content of the Bi powder accounts for 1.5% (mole fraction) of the Mg powder and the S i powder, the Mg powder, the S i powder and the Bi powder are fully mixed, and a mixed powder material is obtained; s3, magnesium silicide is prepared through a spark plasma sintering method, the mixed powder material is put into a high-strength graphite mold for current activation, and the mixed powder material is subjected to current activation through two electrodes installed on the upper portion and the lower portion of the mold; s4, shaping deformation is conducted, specifically, under the high-temperature condition, the mixed powder material is subjected to pressure sintering through two die punches installed on the upper portion and the lower portion of a die; after the thermoelectric material block is doped with the Bi powder, the thermoelectric performance of the thermoelectric material block is remarkably improved, and the economic effect is better.
本发明属于热电材料制备领域，提供了一种制备硅化镁热电材料块体的方法及热电材料块体，包括以下步骤：S1、原料称量，通过化学方程式中各个物质系数之比称量高纯的Mg粉和S i粉；S2、掺杂混合，称量Bi粉，Bi粉含量为Mg粉和S i粉的1.5％(摩尔分数)，将Mg粉、S i粉和Bi粉充分混合，得到混合粉体材料；S3、通过放电等离子烧结法制备硅化镁，将混合粉体材料放入高强度石墨模具内部进行电流激活，通过安装在模具上下的两个电极对混合粉体材料进行电流激活；S4、塑形变形，在高温条件下，通过安装在模具上下的两个模冲对混合粉体材料进行加压烧结；本发明制成的热电材料块体掺杂B i粉末后，其自身的热电性能显著提高，所带来的经济效应更好。
Method for preparing magnesium silicide thermoelectric material block and thermoelectric material block
一种制备硅化镁热电材料块体的方法及热电材料块体
XUE LISHA (author) / ZHAI XIAOLI (author) / YAN ZHANHENG (author) / WANG YUAN (author) / MAO QIANHUI (author) / SU LIXIA (author)
2024-10-18
Patent
Electronic Resource
Chinese
| European Patent Office | 2023
| European Patent Office | 2023