4results about How to "Uniform tissue structure" patented technology

The gradient hard alloy comprises a core layer and surface layers, the core layer is located between the two surface layers, each of the core layer and the surface layers comprises a hard phase and a high-entropy binding phase, and the hard phase comprises WC and a cubic phase compound; components of the high-entropy binding phase comprise at least five of first transition metal elements and second transition metal elements, the first transition metal elements comprise at least two of Co, Ni and Fe, the second transition metal elements comprise at least three of Re, Ru, Rh, Pd, Os, Ir and Pt, the mass content of the high-entropy binding phase on the surface layer is 1.0-2.0 times of the nominal mass content, the surface layer is free of cubic phase compounds, and the thickness of the cubic phase compounds is 0.5-1.5 mm. The gradient hard alloy has the advantages of being high in density, free of third phase precipitation and good in alloy performance.

The application belongs to the technical field of precious metal sputtering target material, and discloses a preparation method of a nickel-platinum alloy target material for magnetron sputtering. The preparation method of the nickel-platinum alloy target material for magnetron sputtering comprises the following steps: (1) mixing nickel powder and platinum powder and ball milling; (2) hot-pressing sintering; (3) smelting; (4) rolling; and (5) performing shape processing after annealing to obtain the nickel-platinum alloy target material. The nickel-platinum alloy target material prepared by the method has uniform internal grain structure and high density, and the nickel-platinum alloy target material has high yield, fine grains and stable sputtering, which is beneficial to obtaining a high-quality thin film with uniform thickness.

This invention provides a method for preparing a CBN grinding wheel, comprising the following steps: melting the raw materials of a ceramic binder, quenching them in water, and then crushing them to obtain a ceramic binder; impregnating the CBN grinding wheel metal matrix in a CBN grinding wheel impregnation slurry, drying and curing it to obtain a CBN grinding wheel blank; sintering the CBN grinding wheel blank and then machining it to obtain the final product; the raw materials of the ceramic binder, by weight percentage, include 10-15% boric acid, 5-6% lithium carbonate, 30-49% silicon dioxide, 28-40% bismuth oxide, 2-3% calcium fluoride, 2-3% nickel oxide, 2-3% cobalt oxide, and 2-3% titanium oxide; the CBN grinding wheel impregnation slurry, by weight percentage, includes 40-45% CBN abrasive, 10-15% the ceramic binder, 33-36% ethanol, 8-10% alcohol-soluble phenolic resin, and 0.5-1% silane coupling agent.

This invention relates to a method for preparing high-performance, low-temperature-coefficient Sm-Co permanent magnet materials, belonging to the technical field of samarium-cobalt permanent magnet materials. It solves the problem in the prior art where the magnetic properties and temperature coefficient are difficult to balance due to the addition of heavy rare earth elements in 2:17 type samarium-cobalt magnets. The method includes: S1, preparing the alloy composition Sm according to a mass percentage... a Ho b Co c Fe d Cu e Zr f Where a, b, c, d, e, and f are the mass percentages of Sm, Ho, Co, Fe, Cu, and Zr, respectively, and satisfy the following conditions: 18≤a≤25, 1≤b≤5, 40≤c≤50, 19≤d≤24, 5≤e≤6, 2.5≤f≤3.5, and a+b+c+d+e+f=100; S2, induction melting and casting; S3, medium crushing; S4, sequentially pulverizing and sieving by fluidized bed jet milling, followed by ball milling under nitrogen protection; S5, magnetic field orientation and delayed pressure molding; S6, sintering, solution treatment, and aging treatment under micro-negative pressure. The magnet prepared by this invention has a room temperature remanence Br≥11kGs, and the absolute value of the remanence temperature coefficient |α|≤0.03% / ℃ in the range of 25~150℃, achieving a good balance between high remanence and low temperature coefficient, which can meet the long-term service requirements of precision instruments in a wide temperature range environment.