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Preparation method for TiN steel-bonded hard alloy based on nickel chromium molybdenum alloy cast iron

A technology of steel-bonded hard alloy and alloy cast iron, which is applied in the field of preparing chromium-nickel-molybdenum alloy cast iron-based TiN steel-bonded hard alloy by reaction sintering method, which can solve the adverse effects of material structure and performance, unsuitability for large-scale production, and preparation cost Advanced problems, to achieve the effect of improving the bending strength and various properties, small size and uniform distribution

Inactive Publication Date: 2017-06-06
JIANGSU HUICHENG MACHINERY MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] However, the in-situ synthesis method also has many disadvantages: the reinforced particles are limited to thermodynamically stable particles in a specific matrix; the generated ones are relatively complicated and difficult to control; After the bit particles are formed, they often segregate in dendrite gaps or grain boundaries during the casting process, which adversely affects the structure and properties of the material, and the processability is poor, and the preparation cost is higher than the existing process, so it is not suitable for large-scale production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A method for preparing chromium-nickel-molybdenum alloy cast iron-based TiN steel-bonded hard alloy, which adopts the following technical scheme:

[0045] (1) Raw materials:

[0046] The raw materials used are TiO2 powder, ferrochrome powder, ferromolybdenum powder, nickel powder, ferrovanadium powder, ferrosilicon powder, ferromanganese powder, iron powder, colloidal graphite, industrial urea ((NH2)2CO) or ammonia water, CeO 2 , PVA, the powder particle size is 10-50μm;

[0047] (2) Material preparation:

[0048] 1) Preparation of in-situ synthesized TiN powder: prepare TiO2 powder and urea ((NH2)2CO) at an N / Ti atomic ratio of 0.4 to prepare in-situ synthesized TiN mixed powder;

[0049] 2) Preparation of binder phase matrix alloy powder: The chemical composition of the binder phase metal material is: C3.0%, Cr1.3%, Mo0.2%, Ni0.5%, V0.2%, Si1.20% , Mn0.4%, S≤0.02%, P≤0.02%, CeO 2 , Y 3 o 2 , La 2 o 3 One or more combinations of two or more ≤ 0.8%, the balance ...

Embodiment 2

[0058] A method for preparing chromium-nickel-molybdenum alloy cast iron-based TiN steel-bonded hard alloy, which adopts the following technical scheme:

[0059] (1) Raw materials:

[0060] The raw materials used are TiH2 powder, ferrochrome powder, ferromolybdenum powder, nickel powder, ferrovanadium powder, ferrosilicon powder, ferromanganese powder, iron powder, nickel powder, industrial urea ((NH2)2CO) or ammonia water, colloidal graphite, CeO 2 , Y 3 o 2 Two kinds, PVA, the powder particle size is 10-50μm;

[0061] (2) Material preparation:

[0062] 1) Preparation of in-situ synthesized TiN powder: prepare iH2 powder and urea ((NH2)2CO) at an N / Ti atomic ratio of 0.9 to prepare in-situ synthesized TiN mixed powder;

[0063] 2) Preparation of matrix alloy powder for the bonding phase: the chemical composition of the bonding phase metal material is: C3.2%, Cr1.9%, Mo0.4%, Ni1.5%, V0.4%, Si1.6% , Mn0.8%, S≤0.02%, P≤0.02%, CeO 2 , Y 3 o 2 , La 2 o 3 One or more comb...

Embodiment 3

[0072] A method for preparing chromium-nickel-molybdenum alloy cast iron-based TiN steel-bonded hard alloy, which adopts the following technical scheme:

[0073] (1) Raw materials:

[0074] The raw materials used are Ti powder, ferrochrome powder, ferromolybdenum powder, nickel powder, ferrovanadium powder, ferrosilicon powder, ferromanganese powder, iron powder, industrial urea ((NH2)2CO) or ammonia water, colloidal graphite, CeO 2 , Y 3 o 2 , La 2 o 3 , PVA, the powder particle size is 10-50μm;

[0075] (2) Material preparation:

[0076] 1) Preparation of in-situ synthesized TiN powder: prepare Ti powder and urea ((NH2)2CO) at an N / Ti atomic ratio of 1.0 to prepare in-situ synthesized TiN mixed powder;

[0077] 2) Preparation of binder phase matrix alloy powder: The chemical composition of the binder phase metal material is: C3.5%, Cr2.5%, Mo0.6%, Ni2.0%, V0.6%, Si2.0% , Mn1.2%, S≤0.02%, P≤0.02%, CeO 2 , Y 3 o 2 , La 2 o 3 One or more combinations of two or more ...

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Abstract

The invention relates to a preparation method for a TiN steel-bonded hard alloy based on nickel chromium molybdenum alloy cast iron. The preparation method is characterized in that in-situ synthesis TiN powder is prepared, wherein one or three of Ti02 powder or TiH2 powder or Ti powder and urea ((NH2)2CO) are prepared into the in-situ synthesis TiN powder according to the N / Ti atomic ratio of 0.4-1.1; and molybdenum iron powder, vanadium iron powder, chrome iron powder, ferromanganese powder, ferrosilicon powder, iron powder, nickel powder, colloidal graphite and rare earth raw materials are prepared according to the required proportion of the mass ratio of bonding phase chemical compositions and put into a steel ball to be ball-milled, anhydrous ethanol as a medium and PVA are added, slurry obtained after ball-milling is dried, pressed, formed and sintered, and the TiN steel-bonded hard alloy is obtained. According to the preparation method, a in-situ reaction synthesis technology is combined with a liquid phase sintering technology, the size of reinforced particles is wee, the surface is free of sharp tips, the base body interface bonding is good, and the interface is clean. By the adoption of the preparation method for the TiN steel-bonded hard alloy based on the nickel chromium molybdenum alloy cast iron, the comprehensive mechanical performance of the alloy can be improved, the cost is low, and the process is easy and convenient.

Description

[0001] field of invention [0002] The invention relates to a preparation method of a chromium-nickel-molybdenum alloy cast iron-based TiN steel-bonded hard alloy, in particular to the technical field of preparing a chromium-nickel-molybdenum alloy cast iron-based TiN steel-bonded hard alloy by a reaction sintering method. [0003] Background of the invention [0004] Steel-bonded cemented carbide (hereinafter referred to as steel-bonded alloy) is produced between cemented carbide and alloy tool steel, die steel and high-speed steel with steel as the matrix, tungsten carbide, titanium carbide, etc. Between high-life mold materials and engineering materials. The proportion range of steel bonded alloy steel matrix binder phase and hard phase is quite wide, which determines that it has the following excellent properties: 1) Wide range of process properties, mainly forgeability, machinability and heat treatability and solderability. 2) Good physical and mechanical properties, mai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/08C22C37/10C22C33/02C22C33/08C22C29/16C22C1/05C22C1/10
CPCC22C37/08C22C1/053C22C29/005C22C29/16C22C33/0207C22C33/0292C22C33/08C22C37/10
Inventor 邵慧萍丁家伟丁刚耿德英鹿薇薇鹿策施孟达陈志和朱坚
Owner JIANGSU HUICHENG MACHINERY MFG
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