2results about How to "Small aspect ratio" patented technology

The application discloses a high-sulfur manganese free-cutting steel MnS inclusion modification preparation method and belongs to the technical field of steel metallurgy. The application forms fine and dispersed rare earth manganese sulfur oxides in the steel through a strict smelting process, and the rare earth manganese sulfur oxides serve as the nucleation core of MnS inclusions in the solidification process, so that the MnS is attached to the surface of the nucleation core to generate composite inclusions. The spheroidization of the rare earth inclusions can reduce the length-width ratio of the MnS inclusions, reduce the anisotropy of the steel, realize the modification of the inclusions and further improve the performance. Through LaMn alloy modification treatment, the morphology of the MnS in the high-sulfur manganese medium-carbon free-cutting steel is improved, the MnS is changed from a strip shape or a chain shape into a fine and uniformly distributed spherical shape or a near-spherical shape, stress concentration is effectively reduced, the Mn content in the steel is also improved, the steel is not infinitely intermingled with the matrix, and the mechanical performance and the cutting performance of the steel are significantly improved.

The invention discloses a high-rate lithium ion battery graphite negative electrode material and a preparation method thereof. The high-rate lithium ion battery graphite negative electrode material is prepared by the steps of crushing petroleum coke particles, calcining at low temperature, graphitizing at high temperature, cooling, demagnetizing and the like. Through the synergistic effect of multiple processes of raw material crushing, low-temperature calcination and high-temperature graphitization, a large number of micropores and defects are introduced into a carbon matrix, and a shorter diffusion path and an isotropic ion transmission channel are provided for lithium ions; and the lithium ion battery graphite negative electrode material with better rate capability, cycling stability and dynamic performance is prepared.