Composite ceramic powder, ceramic preparation method and application thereof

Abstract

The invention discloses composite ceramic powder, a ceramic preparation method and application thereof, and belongs to the technical field of ceramics. The composite ceramic powder comprises submicron ceramic powder, metal copper powder and silver powder, the ceramic powder is formed by combining one or more of aluminum oxide, zirconium oxide, silicon oxide and aluminum carbide ceramics, the metal copper powder is oxygen-free copper, and the silver powder is metal silver powder or oxidized silver powder or a mixture of the metal silver powder and the oxidized silver powder. The silver component is introduced, so that the obtained material has silver ion sterilization and antibacterial effects, and a bearing and / or a shaft core of a liquid cooling heat dissipation pump prepared from the composite ceramic powder has relatively high antibacterial capability; the problems that the service life, the heat dissipation capacity and the reliability of the liquid cooling heat dissipation pump are reduced due to microbial contamination in the liquid cooling heat dissipation pump in the prior art are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of ceramics, and in particular relates to composite ceramic powder, a ceramic preparation method and application thereof. Background Art

[0002] As the density of electrons increases, all walks of life need to use liquid supply pumps. Currently, liquid cooling pumps on the market often have problems such as short life, weakened heat dissipation capacity, and low reliability. The reason is that many heat exchange fluids are contaminated after being used for a period of time, blocking the liquid flow channel or greatly increasing the resistance to liquid flow. This contamination comes from the viscous products produced by the metabolic activities of microorganisms that affect the motor shaft and bearings of the liquid cooling pump, and from the chemical corrosion of cold microbial metabolites on the motor shaft and bearings of the liquid cooling pump. Summary of the invention

[0003] Purpose of the invention: To provide a composite ceramic powder, a ceramic preparation method and its use. The bearings and / or shaft cores of a liquid cooling heat pump made of the composite ceramic powder have strong antibacterial ability, thereby improving the service life, heat dissipation capacity and reliability of the liquid cooling heat pump.

[0004] The technical solution of the present invention is as follows: in a first aspect, the composite ceramic powder comprises: submicron ceramic powder, metal copper powder and silver powder.

[0005] The ceramic powder is a combination of one or more of alumina, zirconium oxide, silicon oxide and aluminum carbide ceramics.

[0006] The metal copper powder is oxygen-free copper.

[0007] The silver powder is metallic silver powder or silver oxide powder or a mixture of the two.

[0008] In a further embodiment of the first aspect, the particle size of the ceramic powder is 0.4 to 1 micron.

[0009] The particle size of the metal copper powder is 0.6-1 micron.

[0010] The particle size of the metallic silver powder is 0.1-0.5 microns.

[0011] In a further embodiment of the first aspect, the mass fraction of the ceramic powder is 40-70 parts.

[0012] The mass parts of the metal copper powder are 27 to 50 parts.

[0013] The mass parts of the metallic silver powder are 3 to 10 parts.

[0014] In a second aspect, a ceramic preparation method based on the ceramic powder described in the first aspect includes: using one of dry pressing, casting, gel, injection molding, dry bag isostatic pressing, spraying, screen printing, and 3D printing to process the ceramic powder into ceramics.

[0015] In a further embodiment of the second aspect, processing of ceramics includes one or more of grinding, turning, milling, boring, and drilling.

[0016] In a third aspect, the ceramic powder described in the first aspect is used to make a motor shaft core and / or a bearing.

[0017] The beneficial effects of the present invention are as follows: the present application ensures the rigidity of the motor bearings and the shaft core of a small-diameter liquid-cooled heat pump by using a ceramic filler with high hardness as the main component, and by introducing a silver component, the resulting material has the bactericidal and antibacterial effect of silver ions. Through the design of the copper component, the corrosion resistance and the mechanical properties of the antibacterial motor bearings and shaft core materials for the entire liquid-cooled heat pump are balanced. Copper ions can also inhibit some microorganisms, and at the same time generate a copper oxide film to slow down corrosion, thereby solving the problem of reduced service life, heat dissipation capacity and reliability of the liquid-cooled heat pump caused by microbial contamination in the prior art liquid-cooled heat pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the process of manufacturing a motor shaft core and / or a bearing using the ceramic powder of the present invention.

[0019] Figure 2 It is a comparison table of the effects of three embodiments of the present invention and a control group of 304 stainless steel. DETAILED DESCRIPTION

[0020] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present invention. However, it is apparent to those skilled in the art that the present invention can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present invention, some technical features well known in the art are not described.

[0021] The present application discloses a composite ceramic powder, a ceramic preparation method and uses thereof. The ceramic powder is used to make a motor shaft core and / or bearing of a liquid-cooling heat pump. The bearings and / or shaft core of the liquid-cooling heat pump made using the composite ceramic powder have strong antibacterial ability, thereby improving the service life, heat dissipation capacity and reliability of the liquid-cooling heat pump.

[0022] In the first aspect, the invention comprises: submicron ceramic powder, metal copper powder and silver powder, wherein submicron refers to 0.1 to 1 micron.

[0023] The ceramic powder is composed of one or more of alumina, zirconium oxide, silicon oxide, and aluminum carbide ceramics. The particle size of the ceramic powder is 0.4 to 1 micron, and the mass fraction of the ceramic powder is 40 to 70 parts.

[0024] The metal copper powder is oxygen-free copper, the particle size of the metal copper powder is 0.6-1 micron, and the mass fraction of the metal copper powder is 27-50 parts.

[0025] The silver powder is metallic silver powder or silver oxide powder or a mixture of the two. The particle size of the metallic silver powder is 0.1-0.5 microns, and the mass fraction of the metallic silver powder is 3-10 parts.

[0026] In a second aspect, a ceramic preparation method based on the ceramic powder described in the first aspect includes but is not limited to: using one of dry pressing, casting, gel, injection molding, dry bag isostatic pressing, spraying, screen printing, and 3D printing to process the ceramic powder into ceramics.

[0027] After the ceramic is formed, the ceramic can be processed, and the ceramic processing includes but is not limited to: one or more of grinding, turning, milling, boring, and drilling.

[0028] In a third aspect, the ceramic powder described in the first aspect is used to make a motor shaft core and / or a bearing. Embodiment 1:

[0029] (1) 70 parts of zirconium oxide with a median diameter of 0.9 micrometers, 27 parts of copper oxide with a median diameter of 0.95 micrometers, and 3 parts of silver powder with a median diameter of 0.1 micrometers are mixed evenly to prepare a composite ceramic powder.

[0030] (2) The composite ceramic powder is prepared into a tape casting slurry by adding a certain proportion of PVB binder, toluene, ethanol, DOP and dispersant, and then tape casting, debinding and sintering are performed to obtain a composite ceramic.

[0031] (3) The composite ceramics are cut and cylindrically ground using a grinder to produce a motor shaft core with a diameter of 2.5 mm × 40 mm. Embodiment 2:

[0032] (1) 40 parts of silicon carbide with a median diameter of 0.9 microns, 50 parts of copper oxide with a median diameter of 0.90 microns, and 10 parts of silver powder with a median diameter of 0.5 microns were mixed evenly to prepare a composite ceramic powder.

[0033] (2) The mixed ceramic powder is added with a certain proportion of PVA binder, water and dispersant to prepare a granulation slurry, and then spray granulation, dry pressing, debinding and sintering are performed to obtain a composite ceramic.

[0034] (3) The composite ceramics are cut and cylindrically ground using a grinder to produce a motor shaft core with a diameter of 2.5 mm × 40 mm. Embodiment 3:

[0035] (1) 40 parts of silicon oxide with a median diameter of 0.4 microns, 55 parts of copper oxide with a median diameter of 0.60 microns, and 5 parts of silver powder with a median diameter of 0.25 microns were mixed evenly to prepare a composite ceramic powder.

[0036] (2) The mixed ceramic powder is added with a certain proportion of PVA binder, water and dispersant to prepare a granulation slurry, and then spray granulation, isostatic pressing, debinding and sintering are performed to obtain a composite ceramic.

[0037] (3) The composite ceramics are cut and cylindrically ground using a grinder to produce a motor shaft core with a diameter of 2.5 mm × 40 mm.

[0038] As described above, although the present invention has been shown and described with reference to specific preferred embodiments, it should not be construed as limiting the present invention itself. Various changes may be made to it in form and detail without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims

1. Composite ceramic powder, characterized in that: include: Submicron ceramic powder, metallic copper powder and silver powder; The ceramic powder is a combination of one or more of alumina, zirconium oxide, silicon oxide, and aluminum carbide ceramics; The metal copper powder is oxygen-free copper; The silver powder is metallic silver powder or silver oxide powder or a mixture of the two.

2. The composite ceramic powder according to claim 1, characterized in that: The particle size of the ceramic powder is 0.4 to 1 micron; The particle size of the metal copper powder is 0.6 to 1 micron; The particle size of the metallic silver powder is 0.1-0.5 microns.

3. The composite ceramic powder according to claim 1, characterized in that: The mass parts of the ceramic powder are 40 to 70 parts; The mass parts of the metal copper powder are 27 to 50 parts; The mass parts of the metallic silver powder are 3 to 10 parts.

4. A method for preparing ceramics based on the ceramic powder according to any one of claims 1 to 3, characterized in that: include: The ceramic powder is processed and formed into ceramics by using one of dry pressing, casting, gel, injection molding, dry bag isostatic pressing, spraying, screen printing, and 3D printing.

5. The ceramic preparation method according to claim 6, characterized in that: The processing of ceramics includes one or more of grinding, turning, milling, boring and drilling.

6. The ceramic powder according to any one of claims 1 to 3 is used to make motor shaft cores and / or bearings.

Images