Iron-nickel-based high-temperature self-lubricating hot work die material and its preparation method

A high-temperature self-lubricating and hot-working mold technology, which is applied in the field of metal material preparation, can solve problems such as insufficient bonding strength between the coating and the substrate, unsuitability for large molds, and poor wettability of components, so as to improve internal wettability and realize The effect of clean production and low cost

Active Publication Date: 2020-12-22
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The coating process prepared by surface technology is simple, but the bonding strength between the produced coating and the substrate is not enough, and its use in the service environment of hot work molds is limited
The smelting casting method has the problem of poor wettability of each component for different materials, and at the same time, the manufacturing cost is high, so it is not suitable for preparing large molds

Method used

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  • Iron-nickel-based high-temperature self-lubricating hot work die material and its preparation method
  • Iron-nickel-based high-temperature self-lubricating hot work die material and its preparation method
  • Iron-nickel-based high-temperature self-lubricating hot work die material and its preparation method

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Experimental program
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Effect test

preparation example Construction

[0045] refer to Figure 1 to Figure 7 , a preparation method based on the above-mentioned iron-nickel-based high-temperature self-lubricating hot work die material, comprising the following steps:

[0046] Step S10, preparing iron-nickel-based alloy powder by mechanical alloying;

[0047] Step S20, putting the iron-nickel-based alloy powder, hard phase and solid lubricant into a ball mill tank, filling it with argon gas for protection, and mixing materials through a ball mill to obtain a composite powder;

[0048] Step S30, putting the composite powder into a mold of a certain shape and size, and pressing it on a press to obtain a green compact of a certain shape and size;

[0049] Step S40, putting the compact into a vacuum furnace for sintering to obtain an iron-nickel-based high-temperature self-lubricating material (for the sintering process, refer to figure 1 ).

[0050] In step S10, when the iron-nickel-based alloy powder is prepared by mechanical alloying, C powder, ...

Embodiment 1

[0057] refer to Figure 7 , when it is used for the hot extrusion die die of tubular parts, its preparation method is as follows.

[0058] (1) Preparation of iron-nickel-based high-temperature self-lubricating materials

[0059] ① Mechanical alloying. According to mass percentage, 0.1%~0.2% C powder (purity greater than 99.9%), 14%~16% Cr powder (purity greater than 99.95%), 33%~36% Ni powder (purity greater than 99.5%), 3.4 %~4.4% Mo powder (purity greater than 99%), 4.1%~5.3% Ti powder (purity greater than 99%) and 40%~41% Fe powder (purity greater than 99.9%) to prepare mixed powder. Put the powder into a stainless steel tank and fill it with argon gas protection. The ball-to-material ratio is 20:1, and the ball mill speed is 250r / min for ball milling for 48 hours, and then 2% zinc stearate is added for ball milling for 2 hours to obtain iron-nickel-based alloy powder.

[0060] ② Mixing by ball milling. Alloy powder (84%) obtained in step ①, hard phase Cr 2 o 3 (10%) ...

Embodiment 2

[0067] refer to Figure 8 , when used for the die of the hot forging die of the valve, the differences between this embodiment and embodiment 1 are:

[0068] The contents of self-lubricating materials are respectively, alloy powder (72%), hard phase Cr 2 o 3 (20%) and solid lubricant CaF 2 (8%).

[0069] The hardness value of the material was measured with a Vickers hardness tester, the applied pressure was 10g, and the duration was 10s. Each sample tested 10 values ​​in different areas, and the average value was taken. The material hardness reached 312.4HV.

[0070] Through the high-temperature friction and wear testing machine, the test shows that the friction coefficient of the material is about 0.3. Compared with the material without adding solid lubricant, the friction coefficient can be improved.

[0071] The method for preparing iron-nickel-based high-temperature self-lubricating hot-working mold materials proposed by the present invention prepares high-strength sol...

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Abstract

The invention discloses an iron-nickel-based high-temperature self-lubricating hot-working die material which comprises an alloy matrix, a solid lubricant and a hard phase, wherein an ingredient of the alloy matrix is iron-nickel-based alloy powder, and the alloy matrix is prepared by taking a GH2135 ingredient as the standard; the solid lubricant is CaF2; the hard phase is Cr2O3; three phases ofpowder of the alloy matrix, the solid lubricant and the hard phase are uniformly mixed by a ball mill, and then a hot-working die is prepared by a powder metallurgy method. The iron-nickel-based high-temperature self-lubricating hot-working die disclosed by the invention can implement self-lubrication under the condition of no oil or little oil, and meanwhile, is low in production cost.

Description

technical field [0001] The invention relates to the technical field of metal material preparation, in particular to an iron-nickel-based high-temperature self-lubricating hot-working mold material and a preparation method thereof. Background technique [0002] When the mold is in service, it contacts with the forming blank and produces relative motion, which causes severe friction on the surface of the mold, resulting in continuous wear of the contact surface, which leads to the failure of the mold. Especially in high-temperature service environment, contact with hot metal will cause the surface metal of the mold cavity to be heated, and at the same time, the plastic deformation of the blank in the cavity will cause relative movement, which will cause severe friction on the surface of the cavity, causing the surface material of the mold to wear serious. In order to ensure the service life of the mold, lubrication is the most effective measure to solve the wear of the mold. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C30/00C22C32/00C22C1/05
CPCC22C1/05C22C30/00C22C32/00C22C33/0278C22C38/06C22C38/44C22C38/50
Inventor 王华君周春杨姚振华燕松山李梦璐杨浩曾鲜
Owner WUHAN UNIV OF TECH
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