Hard alloy sintered anti-sticking coating adopting alcohol-soluble boron modified phenolic resin as well as preparation method and application of hard alloy sintered anti-sticking coating

Abstract

The invention discloses a hard alloy sintered anti-sticking coating adopting alcohol-soluble boron modified phenolic resin as well as a preparation method and application of the hard alloy sintered anti-sticking coating; the anti-sticking coating is formed by mixing solid isolation powder and a liquid adhesive; the solid isolation powder comprises the components in parts by weight: 18-53 parts ofzirconium oxide, 1-6 parts of cerium oxide, 1-5 parts of silicon oxide, 10-30 parts of crystalline flake graphite and 5-45 parts of fine carbon black; and the liquid adhesive comprises the componentsin parts by weight: 3-10 parts of alcohol-soluble boron modified phenolic resin, 1-5 parts of a thickening agent, 2-5 parts of a dispersing agent, 3-5 parts of an active agent, 2-5 parts of a curing agent, 0.1-1.5 parts of a defoaming agent and 250-300 parts of a diluent. The anti-sticking coating has enough bonding strength and hardness after being brushed, and a coating layer is not prone to falling off and chipping in the hard alloy product placing, transporting and charging processes; after sintering, the coating layer can still keep high hardness and bonding strength, and the influence ofwater on the stability of an alloy product during sintering is avoided.

Description

technical field [0001] The invention relates to the technical field of cermet and cemented carbide manufacturing, in particular to a cemented carbide sintering anti-stick coating using alcohol-soluble boron-modified phenolic resin and its preparation method and application. Background technique [0002] Sintering is one of the important processes in the production of cemented carbide. The anti-stick coating of graphite boat or graphite plate is an important factor affecting the quality of cemented carbide products. At present, there are several commonly used cemented carbide sintered anti-sticking coatings in China. [0003] 1: Plasma spraying zirconia and rare earth stabilizer coating [0004] When sintering CNC blades, ultra-fine cemented carbide extruded rods and alloy materials with multi-component components, it is necessary to maintain a stable atmosphere in the vacuum-pressure furnace during sintering to reduce the interference of the coating layer on the quality of ...

AI Technical Summary

Problems solved by technology

[0010] (1) Before sintering, this kind of anti-adhesive coating is easy to fall off during the placement of alloy products and transportation, or during furnace loading; after sintering, the anti-adhesive coating is loose, and the coating and alloy are easily mixed together, giving Alloy product cleaning and finishing cause trouble

[0011] (2) The sintered high-cobalt alloy coating layer needs to be brushed twice, or add anti-sticking paper. During the sintering process, excessive organic matter volatilizes, pollutes the atmosphere in the furnace, and affects the stability of the alloy product and the quality of the alloy.

[0012] (3) When sintering larger alloy products or high-cobalt alloys, it is easy to contact with graphite plates, resulting in carburization of products

[0013] (4) The viscosity of the coating liquid is low, the ability to suspend the solid isolation layer is poor, the distribution of solid powder in the coating is uneven, and the coating layer is unevenly painted

[0014] (5) The moisture retention ability of the paint is poor, the storage time of the paint is short, and it is easy to dry into lumps

[0018] (1) Cellulose-PEG-Tween are all organic matter, high temperature difference, after high temperature sintering, the organic matter in the coating layer is all volatilized, and the strength, hardness and strength of the coating layer are still not ideal

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