Preparation method of high-strength carbon-carbon sagger for graphite negative electrode

The invention discloses a preparation method of a high-strength carbon-carbon sagger for a graphite negative electrode, which comprises the following steps of: cutting and crushing carbon fibers into fiber powder, mixing the fiber powder with a resin infusion agent, and sequentially carrying out mould pressing preforming, isostatic pressing, primary carbonization, impregnation, secondary carbonization, finish machining and two times of vapor deposition to obtain the high-strength carbon-carbon sagger. By changing raw materials into carbon fibers, compared with a long carbon fiber preform, the preparation process is reduced, the cost advantage is obvious, isostatic pressing is carried out on a preformed semi-finished product, the density of the sagger is increased, the internal mechanical isotropy is improved, the strength performance of the sagger is improved, and through two-stage vapor deposition, the surface density is greatly improved, and the strength performance of the sagger is improved. The anti-oxida