7results about How to "Improve sintered density" patented technology

This invention discloses a black-based blue-spotted glaze with an earthworm-like pattern and its preparation method. The glaze consists of a body, a black base glaze, and a blue-spotted glaze from the inside out. The raw materials for the black base glaze are: feldspar, calcite, calcium borate, dolomite, talc, barium carbonate, quartz, bentonite, zirconium silicate, rutile, cobalt oxide, manganese oxide, and iron oxide. The raw materials for the blue-spotted glaze are: feldspar, limestone, alumina, talc, barium sulfate, Datong clay, zinc oxide, quartz, and titanium dioxide. The preparation method includes: 1. Wet ball milling the black base glaze raw materials to obtain a black base glaze slurry; 2. Wet ball milling the blue-spotted glaze raw materials to obtain a blue-spotted glaze slurry; 3. Bisque firing the body; 4. Applying the black base glaze slurry to the body and drying it; 5. Applying the blue-spotted glaze slurry to the body and drying it; 6. Oxidation firing and reduction firing of the body, followed by natural cooling to obtain the black-based blue-spotted glaze. The raw material formula of this invention is reasonable and environmentally friendly, which can improve the mechanical properties of the glaze; the preparation method is simple and the yield is high.

This invention discloses a high thermal conductivity semiconductor packaging substrate and its preparation method, relating to the field of electronic materials technology. The method includes the following steps: mixing composite aluminum nitride powder with a sintering aid, ball milling, drying, and pressing into shape; sintering under high temperature and high pressure in a nitrogen atmosphere to obtain an aluminum nitride ceramic substrate; washing and drying the aluminum nitride ceramic substrate; covering both sides of the aluminum nitride ceramic substrate with copper foil, laying active solder between the aluminum nitride ceramic substrate and the copper foil, and then connecting them by vacuum brazing to obtain the semiconductor packaging substrate; the composite aluminum nitride powder is composed of aluminum nitride powder and modified aluminum nitride powder in a mass ratio of (6~8):(2~4). The semiconductor packaging substrate prepared by this method has excellent interfacial compatibility, effectively reduces interfacial thermal stress, and has good thermal conductivity.

The invention relates to the technical field of aluminum-based composite material preparation, in particular to a ceramic reinforced aluminum-based workpiece and a preparation method. The ceramic reinforced aluminum-based workpiece is prepared by the method. The method comprises the steps that a forming die is assembled and filled with aluminum-based composite powder; sintering the forming die filled with the aluminum-based composite powder in an inert atmosphere to obtain a sintered green body; performing die forging treatment on the sintered green body to obtain a prefabricated green body; and after the prefabricated blank is machined to the size of a finished product, the prefabricated blank is sequentially subjected to solution treatment and aging treatment, and the ceramic reinforced aluminum-based workpiece is obtained. By means of the method, the ceramic reinforced aluminum-based workpiece with the large length-diameter ratio can be prepared, and the problems that cracks are generated when a formed blank is not separated from the female die, and layering and fragmentation are generated in the demolding process are solved.

The application relates to the technical field of soft magnetic ferrite materials, and discloses a soft magnetic ferrite core with high power density and low loss and an application, wherein the soft magnetic ferrite core is prepared from 70%-73% of main material A, 22%-23% of main material B, 3%-7% of main material C, 0.15%-0.65% of auxiliary material D and 0.08%-0.30% of auxiliary material F; the double auxiliary material system of the auxiliary material D and the auxiliary material F is constructed to improve the grain boundary resistivity, refine the grain size, reduce the sintering temperature and simultaneously realize ultra-low power loss; the whole-process fine process control of step-by-step sand milling, subcritical pre-sintering, secondary submicron sand milling, spray granulation and segmented balanced atmosphere sintering is adopted to obtain a microstructure soft magnetic ferrite core with concentrated particle size, small and uniform spinel phase grain, high sintering density and balanced Fe 2+ / Fe 3+ proportion, so that the soft magnetic ferrite core is successfully applied to the on-board charger and DC-DC converter of a new energy vehicle, a photovoltaic inverter and a 5G communication power supply field.

The application discloses a kind of titanium alloys, the titanium alloy is obtained by titanium alloy powder injection molding;Wherein, the titanium alloy powder includes: titanium alloy ball and TiB2 layer, polyamine layer, graphene oxide layer successively coated on the surface of titanium alloy ball, and the graphene oxide layer contains cerium element.The application also discloses a preparation method of the above-mentioned titanium alloy, comprising the following steps: taking titanium alloy powder and binder mixing, injection molding, degreasing, vacuum sintering at 1000-1100 DEG C for 2-3h, cooling to room temperature, solid solution at 700-720 DEG C for 40-60min, air cooling to room temperature, then heat preservation at 450-470 DEG C for 3-3.5h, and then air cooling to room temperature, to obtain titanium alloy.The titanium alloy has good strength while maintaining good toughness.

The application discloses a manganese-zinc ferrite and a preparation method thereof, and the method comprises the following steps: mixing manganese-zinc ferrite powder and a polyvinyl alcohol solution to obtain a mixture, and grinding the mixture; performing a compression molding treatment on the ground mixture to obtain a compression molding product; and performing a sintering treatment on the compression molding product to obtain the manganese-zinc ferrite; wherein the sintering treatment comprises a temperature rising treatment stage, and the temperature rising treatment stage comprises a plurality of temperature rising stages, at least two of which have different temperature rising rates. The manganese-zinc ferrite prepared by the application can have a high saturation magnetic flux density and a low residual magnetism while keeping a low loss at a high frequency, that is, the manganese-zinc ferrite with a large magnetic induction intensity change amount is prepared.

This invention discloses a low-glass phase exudation zirconium corundum brick and its preparation method, belonging to the field of refractory material technology. It employs a core-shell dopant as a sintering aid. The core-shell dopant has a core-shell structure with flower-shaped nano-titanium dioxide as the core and calcium oxide as the shell. At high temperatures, the flower-shaped nano-titanium dioxide reacts with calcium oxide to form CaTiO3, which resides in the grain boundary pores, reducing the concentration of calcium oxide. CaTiO3 is less prone to hydration, preventing calcium ions from reacting with water vapor in the air to form calcium hydroxide, thus eliminating the volume expansion caused by hydration. The flower-shaped nano-titanium dioxide of this invention possesses a large specific surface area and a flower-shaped structure, enabling it to exert a template effect and guide the CaAl... 12 O 19 Lamellar crystals grow in a directional manner to avoid disordered growth, CaAl 12 O 19 Lamellar crystals can synergistically improve the mechanical strength and toughness of zirconium corundum bricks through crack deflection and bridging.