7results about How to "Improve refinement efficiency" patented technology

The invention belongs to the technical field of nonferrous alloy metallurgy and casting, and particularly relates to an Al-V-C grain refiner and a preparation method and application thereof. Comprising the following steps that Al-10V powder and VC powder are mixed and then subjected to vacuum ball milling, and a mixture is obtained; after a container is preheated, pure aluminum is placed in the container and heated till the pure aluminum is melted to form aluminum melt, the aluminum foil wrapped with the mixture is immersed in the aluminum melt, and mixed melt is formed; raising the temperature of the mixed melt to 1190-1210 DEG C and keeping the temperature; then cooling to 790-810 DEG C, and keeping the temperature; and after the mixture is poured to be in a semi-solid state, continuous rheological extrusion forming is conducted, and the Al-V-C grain refiner is obtained. According to the grain refiner prepared through the method, VAl3 and VC phase distribution is more uniform, an Al matrix is introduced by adding the Al-V-C refiner, heterogeneous nucleation sites of Al are increased, the purpose of grain refinement is achieved, and the problem that the wettability of carbon and aluminum is poor is solved.

This invention proposes a refining device and process for environmentally friendly epoxy zinc-rich anti-corrosion powder coatings, belonging to the technical field of environmentally friendly epoxy zinc-rich anti-corrosion powder coating processing. The refining device includes multiple rotating cylinders arranged sequentially along the axial direction. A gap is provided between adjacent rotating cylinders, and a connecting seat is provided within the gap. The rotating cylinders are rotatably connected to the connecting seats. A ring of first liner plates is evenly spaced within the rotating cylinders. A liner groove is formed between adjacent first liner plates, and a second liner plate is provided within the liner groove. An arc-shaped screen plate is provided within the rotating cylinder, and a pusher plate capable of reciprocating between its two axial ends is provided within the liner groove. This invention has the advantages of high refining efficiency and real-time material discharge.

The invention relates to an aluminum-silicon alloy, a preparation method and application thereof, and an aluminum-silicon alloy product, the aluminum-silicon alloy comprises the following components by mass: 8.5%-10% of S ; 0.1% to 0.5% of Mg; 0.35% to 0.65% of Mn; 0.1% to 0.2% of Fe; 0.05% to 0.2% of Nb; 0.01% to 0.04% of B; 0.01%-0.02% of Sr, and 0.5%-1% of Ti CN; the total content of other impurities is less than or equal to 0.5%. The aluminum-silicon alloy is good in refining effect and has good tensile strength and yield strength.

The invention discloses a pet cat litter preparation method and device based on straw, and solves the problems that when a crushing wheel of existing equipment works, the meshing angle of the crushing wheel is small, and the occlusal force and shear force to straw are weak, the device comprises a device body, a straw pretreatment assembly and a pre-driving assembly, the device main body comprises a device base, a feeding seat and a crushing treatment seat, and the straw pretreatment assembly comprises a first crushing roller, a second crushing roller and an auxiliary roller pressing ring; in the embodiment of the invention, the straw pretreatment assembly and the pre-driving assembly are arranged, and the straw pretreatment assembly and the pre-driving assembly cooperate with each other, so that straw raw materials can be effectively grabbed, the meshing angle with the raw materials is increased, and then the meshing force and the shearing force on the straw are strengthened; the auxiliary rolling ring can perform variable-range pre-crushing treatment on the straw raw materials, so that the crushing efficiency of the straw raw materials is ensured, and the granularity uniformity of cat litter products is indirectly improved.

The invention relates to the technical field of aluminum-based composite materials, and discloses a preparation method of an in-situ A13Ti / Al composite material. The method comprises the following steps: carrying out high-energy ball milling on MAX-phase ceramic particles (Ti2AlC or Ti3AlC2) and aluminum powder to obtain first raw material powder; performing high-energy ball milling on the first raw material powder and aluminum powder to obtain second raw material powder; and the second raw material powder is subjected to cold press molding, powder metallurgy sintering and plastic deformation machining, and the in-situ A13Ti / Al composite material is obtained. According to the method, large-scale engineering preparation can be realized, and the problems that particles are easy to agglomerate and the addition amount is limited when the nanophase is used as a raw material are solved. Meanwhile, the MAX phase can be greatly refined through high-energy ball milling, high-energy defects and diffusion channels are introduced, interface reaction is promoted, the average particle size of A13Ti in the A13Ti / Al composite material is 0.05-0.8 mu m, the content of the A13Ti is 10-40 vol.%, the content of the unreacted MAX phase is smaller than 2 wt.%, and therefore the A13Ti / Al composite material with high modulus, high strength and high heat resistance is obtained.

The invention relates to the technical field of energetic material preparation, in particular to a method for preparing a superfine explosive based on a high-pressure micro-jet technology. Comprising the following steps: (1) preparing explosive particle turbid liquid; (2) high-pressure microjet refining treatment; (3) filtering and drying the superfine explosive; according to the invention, the high-pressure microjet technology is introduced into the refining of the explosive, and explosive particles are crushed and uniformly dispersed by virtue of the effects of shearing, impacting, friction, cavitation and the like generated when the explosive particle suspension passes through the microchannels at a high speed, so that the superfine explosive is prepared. The preparation method disclosed by the invention is simple and reliable, good in repeatability, high in safety and high in heat transfer and mass transfer efficiency, the obtained explosive particles are narrow in particle size distribution, the preparation process is green and environment-friendly, pollutants are not generated, and industrial amplification is easy.

The invention belongs to the technical field of nonferrous alloy metallurgy and casting, and particularly relates to an Al-Ti-V-C refiner for casting an aluminum-silicon alloy and a preparation method and application of the Al-Ti-V-C refiner. Comprising the following steps: mixing pure Al powder, ball-milled nano TiC powder and ball-milled nano VC powder, and carrying out vacuum ball-milling mixing to obtain a mixture; and the mixture is subjected to hot pressing sintering, the temperature is increased to 290-310 DEG C for heat preservation, then the temperature is increased to 460-520 DEG C for heat preservation, a hot-pressed blank is obtained and formed, the hot-pressed blank is subjected to hot extrusion at 300-550 DEG C, and the Al-Ti-V-C refiner is obtained. The preparation method is simple, the raw material burning loss rate can be reduced, raw material loss caused by poor wettability of carbon powder and molten aluminum is avoided, uniform distribution of phases such as TiC and VC in the Al-Ti-V-C refiner is achieved, and the prepared Al-Ti-V-C grain refiner has a good grain refinement effect.