A kind of ceramic piston for air conditioner compressor and preparation method thereof
An air-conditioning compressor and ceramic technology, applied in the field of compressors, can solve the problems of long manufacturing process, high density of stainless steel or cast iron, and high cost, and achieve the effects of reducing wear and friction loss, good wear performance, and good corrosion resistance.
Inactive Publication Date: 2017-09-12
HUNAN UNIV
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Problems solved by technology
[0006] 2) The piston in the compressor is an important core component of the air conditioner. The density of stainless steel or cast iron is high, and it runs for a long time and consumes a lot of energy.
[0007] 3) The metal sliding sheet has good thermal conductivity and poor thermal insulation performance, which reduces the heat exchange efficiency of air conditioners and refrigerators
However, the average particle size of the raw materials used in this invention is less than or equal to 100nm, and the raw material powder must be synthesized by co-precipitation and other methods. The manufacturing process is long and the process is complicated, resulting in expensive raw materials: the invention adopts injection molding method and hot pressing sintering method , hot isostatic pressing method, reaction sintering method and microwave sintering method, the manufacturing process is complicated and the cost is high
Furthermore, the invention does not relate to the finishing of ceramic parts
Method used
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[0021] Using activated alumina micropowder, high plasticity and high binding kaolin, zirconium silicate, potassium feldspar, dolomite, calcined talc, lanthanum oxide, cerium oxide, etc. as raw materials, five formulations were prepared. The formulations are shown in Table 1. The corresponding chemical compositions are listed in Table 2. Plasticizers are added and are not included in the formula composition. Material trial production was carried out for each formula, and a ceramic piston that can be used for installation was obtained.
[0022] Table 1 Formula table of ceramic piston (wt%)
[0023]
[0024] Table 2 implements the chemical composition of example 5 formulas
[0025]
[0026]
[0027] According to the designed formula, accurately weigh various raw materials, put them in a ball mill, add water to mix, and finely grind until the particle size of the raw materials in the slurry is D 50 When the thickness is less than or equal to 10 μm, pulping, dehydration...
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Abstract
The invention discloses a high-aluminum zirconium-containing ceramic piston and a preparation method thereof. Its raw material ratio is as follows: active industrial Al2O3 micropowder 45-70%, good plasticity, clay containing Al2O3≥28% 15-25%; zircon 2-8%, potassium feldspar containing K2O≥10% 4-12% %, 2-8% dolomite, 1-10% talc, 0-3% rare earth oxides; plus 1-3% plasticizer composed of polyvinyl alcohol and carboxymethyl cellulose. The above-mentioned raw materials are weighed according to the formula requirements, mixed with water, finely ground, dehydrated by pressure filtration, vacuum smelted, extruded, dried to constant weight, and then rough processed. The rough machined blank is fired at about 1300°C to obtain a dense porcelain piece, and then it is finished to make it meet the precision requirements of the ceramic piston. The piston has low density and high hardness, and is used in air-conditioning compressors, which can reduce the friction and wear and power loss between the matching air-conditioning sealed compressor cylinders or rolling pistons, and can significantly improve the thermal efficiency of the air-conditioning.
Description
technical field [0001] The invention relates to the technical field of compressors, in particular to a ceramic piston for an air-conditioning compressor and a preparation method thereof. Background technique [0002] The compressor is the heart of various air conditioners and refrigerators, and it is also an important entry point for these equipment to tap the potential of energy saving. Common air-conditioning inverter compressors mainly include scroll type and rotary type. For refrigerators, room air conditioners and air-conditioning units with relatively small cooling capacity, rotary compressors are used because of their small size, light weight, few parts, large speed range, good reliability, small vibration, low noise, and high operating efficiency. Higher, performance price is relatively high, and very popular. Pistons are key components of rotary air conditioner compressors. [0003] Hermetic compressors for air conditioners and refrigerators mainly include eccent...
Claims
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IPC IPC(8): C04B35/10C04B35/622
Inventor 李玉平李骏驰郭永夏宗禹
Owner HUNAN UNIV