3results about How to "Reduced activation energy for diffusion" patented technology

The application belongs to the field of ceramic powder preparation, and discloses a method for in-situ preparation of high-performance TiB2-B4C composite ceramic from sapphire fine grinding waste. The method uses the waste produced in the sapphire grinding process as raw material (B4C, Al2O3 and Fe), adds TiO2 and C after alkali washing and purification, and combines with the discharge plasma sintering to in-situ prepare TiB2-B4C composite ceramic. The method not only realizes the comprehensive recovery of B4C in the sapphire fine grinding waste slurry, reduces environmental pollution, but also provides a method for in-situ preparation of TiB2-B4C composite ceramic from waste, changes waste into treasure, and realizes the secondary use of resources. In addition, the raw material cost is low, and the method has obvious economic value and environmental protection significance. The method has the advantages of short process, small pollution, simplicity and the like, and can be used for industrial production.

The invention relates to the technical field of metal material heat treatment, and discloses a method for improving the performance of a high-strength steel plate through electric field isothermal segmented spheroidizing annealing, which comprises the following steps: selecting a high-carbon martensitic stainless steel cold-rolled plate; fixing in a vacuum furnace, and carrying out radiation preheating to 650-750 DEG C; starting a pulse power supply to cooperate with a radiation field to rapidly heat to 1050-1080 DEG C for austenitizing; the current density is adjusted, air cooling is conducted to 730-760 DEG C, and electric field isothermal spheroidizing annealing is conducted; and finally, cooling to 450-500 DEG C along with the furnace, and then carrying out air cooling. According to the method, carbide dissolution is accelerated through the electromigration effect of pulse current, dispersion and precipitation of fine spherical carbides are promoted through segmented temperature control and an electric field morphological modification mechanism, network carbides are eliminated, the annealing period is obviously shortened, energy consumption is reduced, and the strength, plasticity and corrosion resistance of the steel plate are improved.

A grain boundary optimization method for additive manufacturing of high-temperature alloy based on deep cooling-current synergistic regulation, which relates to the field of metal additive manufacturing post-processing technology. The purpose of the present application is to solve the problem of optimizing the distribution of grain characteristics of GH4099 nickel-based high-temperature alloy manufactured by the existing method due to the lack of recrystallization driving force and the grain boundary pinning effect. Method: 1. Powder pretreatment; 2. Laser additive manufacturing; 3. Cryogenic treatment; 4. Pulse current annealing. The present application proposes a composite process based on "deep cooling treatment-current rapid annealing", which introduces uniform internal stress energy through non-destructive deep cooling treatment, and reduces the recrystallization energy barrier by combining pulse current annealing, thereby realizing high-proportion low-ΣCSL grain boundary construction (target proportion > 50%) while maintaining the advantages of near-net-shape additive manufacturing, thereby significantly improving the material's resistance to grain boundary failure and high-temperature service performance.