Ceramic granulation powder for manufacturing automobile parts and preparation method of ceramic granulation powder

Abstract

The invention discloses a ceramic granulation powder for manufacturing automobile parts. The ceramic granulation powder comprises a porcelain material, a dispersing agent, a composite binder, a mold release agent and a dispersing medium, wherein the porcelain material is composed of the following composition in percentage by weight: 90-94% of alpha-AL2O3 powder, 0.6-1.5% of magnesium oxide, 0.5-4%of calcium carbonate, 1.2-3.5% of silica, 0.1-1.2% of titanium dioxide, 0.5-2.5% of dioxide zirconium, and 0-3.5% of chromium oxide; and the composite binder is a mixture which is prepared by mixingtwo or three of gum arabic with a weight percentage of 1.0-2.5% relative to the porcelain material, PVA-BP17 with a weight percentage of 0-0.6% relative to the porcelain material and PVA-BP05 with a weight percentage of 0-0.3% relative to the porcelain material with water and has a mass concentration of 18%. The prepared ceramic powder has a rupture strength of 350 MPa, the gas tightness of a ceramic and metallized layer can reach 1*10<13> Pa.M<3> / s, and the powder looseness is 1.23 g / cm<3> or more, so that during pressing of a blank, the compression ratio is lowered, and the product shrinkageis reduced.

Description

technical field [0001] The invention belongs to the technical field of alumina ceramics, and in particular relates to a ceramic granulation powder for manufacturing auto parts and a preparation method thereof. Background technique [0002] High-purity alumina ceramics are ceramic materials with an Al2O3 content of more than 99.9%. Because of its sintering temperature as high as 1650-1990°C and a transmission wavelength of 1-6μm, it is generally made of molten glass to replace platinum crucibles; use its light transmission It can be used as a sodium lamp tube because of its high corrosion resistance and alkali metal corrosion resistance; it can be used as an integrated circuit substrate and high-frequency insulating material in the electronics industry. [0003] Ordinary alumina ceramics are divided into 99 porcelain, 95 porcelain, 90 porcelain, 85 porcelain and other varieties according to the Al2O3 content. Sometimes those with Al2O3 content of 80% or 75% are also classifie...

AI Technical Summary

Problems solved by technology

[0005] In the current process of preparing ceramic powder by spray granulation, the ceramic grains are too large, it is not easy to produce glass phase, and the bonding force of ceramic metallization is irrational. A single adhesive is used, and the powder bonding is too low or too high. In the blank process, the compression ratio is high, and the product shrinks and deforms. If the compression ratio is too high, the powder is easily broken and bridge pores are easy to occur. Therefore, it is necessary to improve the ceramic powder formula and preparation method.