Manufacturing method of isolation board for sintering

Abstract

The invention discloses a manufacturing method of an isolation board for sintering. The method comprises the following steps of: 1, preparing polyvinyl alcohol or cellulose into an aqueous solution, adding metal oxide powder and stirring uniformly to obtain slurry; 2, uniformly coating slurry on one or two faces of a metal board with a flat surface; and 3, putting the slurry-coated metal board into a drying oven for drying to obtain the isolation board for sintering. The manufacturing method has the advantages of simple procedures, low cost and high production efficiency. The manufactured isolation board for sintering can be used repeatedly. After the isolation board is used, organic matters are volatilized, oxide powder particles fall, and slurry can be repainted on the recycled metal board after soot cleaning, so that an isolation board for sintering is manufactured for repeated use. The isolation board for sintering manufactured with the method is taken as an isolation layer between laminated plate blanks, so that sintering adhesion of the plate blanks can be prevented effectively, the surfaces of the plate blanks are protected, and the surface quality of the sintering plate blanks is not influenced simultaneously.

Description

technical field [0001] The invention belongs to the technical field of plate blank sintering, and in particular relates to a method for making a sintering isolation plate. Background technique [0002] Sintering in a sintering furnace (or heat treatment furnace) is one of the important processes in material processing technology, especially for powder metallurgy materials. Sintering is an essential process to ensure the final properties of materials. For the sintering of powder metallurgy sheet blanks, layered stacking and sintering in a sintering furnace is a common method; and the heat treatment of a large number of metal sheet blanks can also be stacked and placed in a furnace for processing. The biggest advantage is high production efficiency and low cost. The contact surfaces of the stacked sheet blank products present a tight combination of the same material with a certain extrusion force. During the sintering process, mutual diffusion occurs between the contact surfa...

AI Technical Summary

Problems solved by technology

The contact surfaces of the stacked sheet blank products present a tight combination of the same material with a certain extrusion force. During the sintering process, mutual diffusion occurs between the contact surfaces of the sheet blanks, and it is easy to bond (weld) together, seriously The sintered plate blanks cannot be separated when the sintering temperature is not high; sometimes they can be separated when the sintering temperature is not high, but the contact surface is seriously damaged

In order to solve the above problems, the methods currently used are: ①Separation plate method, adding a layer of separation plate between the laminates, the plate requires higher temperature resistance (above the sintering temperature), and generally uses high-temperature ceramics that do not react with the sintered body Plate, ceramic cloth or ceramic paper, etc. This method can effectively prevent the plate-shaped sintered body from sticking, but the ceramic material will crack after several times of sintering, and the volatilization of the ceramic paper will cause pollution of the sintered material and damage the sintering process. The atmosphere of the furnace; ②Oxide sand bedding method, evenly spread fillers between layered sintered materials, the fillers are granular, generally oxide sand (alumina or zirconia), this method will cause concaves on the surface of the sintered body Pit, the use of fine alumina filler can avoid pits, but fine alumina sand is easy to fly when the vacuum furnace is started, pollute the furnace cavity, affect the vacuum degree, and affect the service life of the sintering furnace. Covering and Sealing and other measures are relatively cumbersome when using this method to install the furnace. Sometimes it is necessary to put the plate blank into the sintering furnace first, and then spread oxide sand on the plate blank; The surface of the plate blank (the plate must be resistant to sintering high temperature) is thermally sprayed with a layer of alumina (zirconium), which is very thin and firmly bonded. This method can achieve the effect of sintering isolation, but the cost of thermal spraying process is high. Moreover, the sprayed layer will fall off after 5-6 times of sintering, and the falling off part will not have the isolation effect. The spraying method will cause high temperature during the production process, and the thinner metal plate will be deformed. Using it as a separator will cause powder metallurgy plates. Deformation of the sintered body of the billet; although the deformation can be avoided by using a thicker metal plate, the lower sintered body will be too heavy and thinner when superimposed, or it will be too dense