Insulation tube preparation method

The invention relates to the technical field of superhard material synthesis, and discloses an insulation tube preparation method which comprises the following steps: S1, pressing samarium oxide powder into a sheet shape to obtain a samarium oxide sheet; s2, primary sintering; s3, crushing the samarium oxide sheet sintered for the first time in the step S2 into powder, and then sieving the powder to obtain a screen underflow; s4, 0.5%-1.25% of graphite powder and 0.6%-1.2% of organic glue are added into the undersize product obtained in the step S3, the mixture is stirred to be uniform, compression molding is carried out after material covering is carried out for 36 h, a molded product is obtained, and the molded product is placed in a drying oven; and S5, secondary sintering. Through the steps of two times of sintering, material burying and the like, the effects that forming is convenient, and deformation is avoided during sintering can be achieved. 本发明涉及超硬材料合成技术领域，公开了绝缘管制备方法，包括以下步骤：S1、将氧化钐粉压成片状得到氧化钐片；S2、一次烧