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High-temperature releasing agent for powder metallurgy hot isostatic pressing

A powder metallurgy heat and mold release agent technology, which is applied to the surface of graphite molds formed by static pressing and the field of high temperature mold release agents for static pressing, can solve the problems of poor load resistance, poor lubricating performance, and sticking of graphite molds. Good resistance to load, excellent lubricating performance, easy release effect

Active Publication Date: 2019-04-05
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Carbon paper has low strength and hardness, and poor load resistance. During the pressurization process, metal powder still pierces the carbon paper, and sticks to the graphite mold at high temperature.
Hexagonal boron nitride has the same hexagonal layered structure as flake graphite, and the interlayer bonding force is smaller than that of adjacent B and N atoms in the layer, but the electrostatic force between the corresponding B and N atoms between layers is stronger than that of graphite Large, so the lubrication performance of hexagonal boron nitride at room temperature is worse than that of graphite
Moreover, the boron nitride coating does not sinter during the powder metallurgy hot isostatic pressing process, and also has the disadvantage of poor load resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Put 100 grams of earthy graphite, 100 grams of hexagonal boron nitride, 100 grams of molybdenum disulfide, 50 grams of methyl silicone oil, and 600 grams of industrial alcohol into a colloid mill to fully grind, add 50 grams of thermosetting phenolic resin, and fully mix and grind High-temperature release agent; the release agent has a viscosity of about 210mPa·s at room temperature, and has strong resistance to metal powder extrusion, and is suitable for hot pressing of a type of metal with high hardness (such as iron, nickel, etc.).

Embodiment 2

[0020] Put 360 grams of earthy graphite, 40 grams of hexagonal boron nitride, 50 grams of molybdenum disulfide, 100 grams of methyl silicone oil, and 400 grams of industrial alcohol into a colloid mill to fully grind, add 50 grams of thermosetting epoxy resin, and fully mix and grind It can be used as a high-temperature release agent; the release agent has a viscosity of about 650mPa·s at room temperature, and has a general resistance to metal powder extrusion, and is suitable for hot pressing of a type of metal with low hardness (such as aluminum-based alloys).

Embodiment 3

[0022] Put 250 grams of flake graphite, 50 grams of hexagonal boron nitride, 50 grams of molybdenum disulfide, 50 grams of methyl silicone oil, and 500 grams of industrial alcohol into a colloid mill to fully grind them, add 100 grams of thermosetting epoxy resin, mix and grind them fully High-temperature release agent; the release agent has a viscosity of about 300mPa·s at room temperature, and has a general resistance to metal powder extrusion, and is suitable for hot pressing of a type of metal with low hardness (such as aluminum-based alloys).

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Abstract

The invention belongs to the technical field of refractory materials, and in particular, relates to a releasing agent with lubricating and releasing effects in a high-temperature state, particularly to a high-temperature releasing agent for powder metallurgy hot isostatic pressing. The high-temperature releasing agent is provided with a lubricating agent consisting of graphite and hexagonal boronnitride; and the mass ratio of the graphite to the hexagonal boron nitride in the lubricating agent is 1: 1-9: 1. The high-temperature releasing agent further comprises thermosetting resins as a bonding agent, molybdenum disulfide as a crush resisting agent, methyl silicone oil as a dispersing agent, and industrial alcohol as diluent; and the mass percentages of the lubricating agent to the bonding agent to the crush resisting agent to the dispersing agent to the diluent are 20-40%, 5-10%, 5-10%, 5-10% and 40-60%. The high-temperature releasing agent is higher in load resistance, excellent inlubricating property under high temperature and high pressure, easy to release, free of bonding molds and convenient to operate, can be directly applied to production scenes, and is suitable for hot isostatic pressing sintering of various alloy powder.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a release agent with lubricating and release effects under high temperature conditions, in particular to a high-temperature release agent for powder metallurgy hot isostatic pressing, which is mainly used in powder metallurgy heat, etc. Hydrostatically formed graphite mold surface. Background technique [0002] Powder metallurgy is a process technology for producing metal powder or using metal powder (or a mixture of metal powder and non-metal powder) as raw material, forming and sintering to manufacture metal materials, composite materials and various types of products. The powder metallurgy method has similarities with the production of ceramics, and both belong to the powder sintering technology. The molding and sintering of dense products is usually carried out under the pressure of 15-600MPa, and the hot isostatic pressing is carried out simultaneou...

Claims

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Application Information

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IPC IPC(8): B22F3/15
CPCB22F3/15B22F2003/026
Inventor 马天飞李红霞王新福刘国齐王刚王建栋于建宾杨文刚钱凡
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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