5 results about "Specific modulus" patented technology

This invention belongs to the field of glass substrate technology, specifically relating to an alkali-free glass substrate and its preparation method, comprising the following raw materials: SiO2, Al2O3, MgO, CaO, BaO, SrO, and B2O3 / C composite microparticles. B2O3 and C are dispersed by laser irradiation ablation combined with microwave and stirring to form uniform and dense nanoparticles. The B2O3 / C composite microparticles significantly improve the clarification effect and reduce the coefficient of thermal expansion. This not only reduces shrinkage deformation during molding but also suppresses flexural deformation during subsequent processing, and increases Young's modulus and specific modulus, which is beneficial for manufacturing thinner and lighter liquid crystal displays. Furthermore, the B2O3 / C composite microparticles coated with silica provide better clarification with a lower content, resulting in an alkali-free glass substrate with a lower coefficient of thermal expansion and higher Young's modulus and specific modulus.

To provide a substrate for magnetic recording media that has high heat resistance and specific modulus, and has low manufacturing costs. [Solution] The magnetic recording medium substrate according to this disclosure has a heat-resistant film on the surface of a steatite sintered body made of one or more alloys selected from the group consisting of SiO2, SiC, Si3N4, and Al2O3.

This invention discloses a method for preparing a high-strength, high-modulus carbon fiber ultrathin prepreg, comprising: spreading high-strength, high-modulus carbon fibers to obtain flat fiber bundles, then stacking and pressing them with a resin film placed above and below them; under the action of temperature and pressure, allowing the resin to fully impregnate the fiber bundles; and then cooling, coating, and winding. The high-strength, high-modulus carbon fiber is one of M40X, M55J, M60J, or higher grade carbon fibers, with a tensile modulus >377 GPa. This invention also discloses the high-strength, high-modulus carbon fiber ultrathin prepreg prepared by the above method and its applications. The spreading roller surface used in this invention is made of polytetrafluoroethylene, and the limiting roller surface is made of ceramic, solving the problems of easy fuzzing and fiber breakage of high-strength, high-modulus carbon fibers, and avoiding corrosion between carbon fibers and metals. The prepreg prepared by this invention has advantages such as high specific strength, high specific modulus, corrosion resistance, and stable structural dimensions, and has broad application prospects in aerospace and other fields.

To provide a substrate for magnetic recording media that has high heat resistance and specific modulus, and has low manufacturing costs. [Solution] The magnetic recording medium substrate according to this disclosure includes a steatite sintered body.

The application discloses an adjustable-angle in-situ polymerization thermoplastic composite material injection-pulling extrusion production equipment, which comprises a base material part for preparing and supplying a base material, a reinforcing part for supplying a reinforcing material, a forming part for making the base material and the reinforcing material into a composite material, and an adjusting part arranged at the bottom of the forming part and used for angle adjustment, and the base material part and the reinforcing part are connected with the forming part. By adjusting the working angle of the forming part, the base material injected into the injection cavity cannot leak from the preforming device, so that the waste of the base material is reduced, production discontinuity caused by leakage and solidification of the base material is avoided, the utilization rate of the base material and the coverage rate of the reinforcing material are improved, the produced profile has high specific strength, specific modulus, corrosion resistance and electrical insulation, and the production cost is reduced.