A preparation method of powder metallurgy tungsten coating insulation brick on zirconia surface

Abstract

The invention discloses a preparation method of a powder metallurgy tungsten-coated thermal insulation brick on the surface of zirconia. Prepare according to the following steps: a. Mix zirconia powder and yttrium oxide powder to obtain product A; b. Separately take zirconia powder, yttrium oxide and tungsten powder and mix to obtain product B; c. Mix product A with Mix the PVA binder to get product C; d. mix product B with PVA binder to get product D; e. pour product C into the mold for pre-pressing to get product E; f. Spread product D evenly and pre-press, so that product D forms an intermediate transition layer on product E; g. Take another tungsten powder PVA and mix it with the binder to obtain product F; h. Spread product F on the intermediate transition layer Form a tungsten layer on the surface of the surface to obtain product G; i. statically press the mold with product G to obtain adobe; j. dry the adobe naturally to obtain product H; k. put product H into a sintering furnace for sintering, Take it out and cool it to get the zirconia brick. The invention has the characteristics of good thermal shock resistance and good thermal insulation performance.

Description

technical field [0001] The invention relates to the field of thermal insulation materials for crystal growth furnaces, in particular to a preparation method for powder metallurgy tungsten-coated thermal insulation bricks on the surface of zirconia. [0002] technical background [0003] Zirconium dioxide (chemical formula: ZrO 2 ) is the main oxide of zirconium, usually white, odorless and tasteless crystals, insoluble in water, hydrochloric acid and dilute sulfuric acid. Usually contain a small amount of hafnium dioxide. The chemical properties are inactive, and it has the properties of high melting point, high resistivity, high refractive index and low thermal expansion coefficient, making it an important high temperature resistant material, ceramic insulating material and ceramic sunscreen, and also the main raw material for artificial drills. [0004] Due to the high temperature resistance and good heat preservation performance of zirconia, currently in the field of cry...

AI Technical Summary

Problems solved by technology

However, after adding metal particles, the thermal conductivity of the insulation layer will be changed as a whole, and the insulation performance of zirconia bricks will deteriorate.