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Diffusion bonding method without external pressure for Ti (C, N)-based metal ceramic and steel

A cermet and diffusion joining technology, applied in the field of welding, can solve the problems of short diffusion time between castings and surface ceramic layers, unfavorable surface densification and sufficient diffusion, large thermal residual stress, etc. The effect of sufficient diffusion time

Inactive Publication Date: 2013-07-10
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The compact prepared in this method usually contains a binder, which is easy to generate gas when pouring molten steel or iron; and the cooling speed after casting is very fast, and the diffusion time between the casting and the surface ceramic layer is short, which is not conducive to the densification of the surface. and sufficient diffusion between the two; fast cooling rate will also cause large thermal residual stress between cermet and steel

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  • Diffusion bonding method without external pressure for Ti (C, N)-based metal ceramic and steel

Examples

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Effect test

example 1

[0017] Example 1: The particle size of Ni in the raw materials used to prepare Ti(C,N)-based cermet is 1.5μm, the particle size of Co is 1.3μm, and the particle size of Fe is 2.0μm, Mo 2 The particle size of C is 1.5μm, TiC 0.7 N 0.3 The particle size is 1.8μm. The weight percentage of Ti(C,N)-based cermet components is 5wt% of Ni, 5wt% of Co, 5wt% of Fe, Mo 2 C accounts for 9wt%, TiC 0.7 N 0.3 For the margin. The ball milling medium of the cermet mixed powder is No. 120 solvent oil, the dosage is 400ml, the ball milling speed is 60r / min, the grinding time is 48h, the grinding ball is WC-8wt%Ni cemented carbide ball with Φ6mm, and the weight ratio of the ball to material It is 5:1, adding 10wt% paraffin, 0.5wt% oleic acid, 0.5wt% Tween 80 as composite forming agent; after ball milling, the cermet slurry is filtered with 400 mesh, and the vacuum drying temperature is 85℃. The vacuum degree is 3Pa; the pressure of the cermet porous green body is 200MPa during pressing, the cavit...

example 2

[0018] Example 2: The particle size of Ni in the raw materials used for the preparation of Ti(C,N)-based cermet is 1.2μm, the particle size of Co is 1.5μm, and Mo 2 The particle size of C is 1.8μm, TiC 0.7 N 0.3 The particle size is 1.4μm; the weight percentage of Ti(C,N)-based cermet is 20wt% Ni, 8wt% Co, Mo 2 C accounts for 12wt%, TiC 0.7 N 0.3 The balance; the ball milling medium of the cermet mixed powder is 120# solvent naphtha, the dosage is 200ml, the ball milling speed is 90r / min, the grinding time is 36h, and the grinding ball is a WC-8wt%Ni cemented carbide ball with Φ8mm. The ball-to-material weight ratio is 10:1, 5wt% paraffin wax, 1wt% oleic acid, 2% Tween 80 are added as composite forming agent; after ball milling, the cermet slurry is filtered with 400 mesh, and the vacuum drying temperature is 95 ℃, the vacuum degree is 3 Pa; the pressure of the porous metal ceramic green body is 100MPa, the cavity volume is fixed, and the porosity of the green body is 75% by ad...

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Abstract

The invention discloses a diffusion bonding method without external pressure for Ti (C, N)-based metal ceramic and steel. The diffusion bonding method is characterized by comprising the following steps of: placing the steel into a middle cavity of a porous metal ceramic green body with the porosity of 75-90%, and performing liquid-phase sintering together, wherein during the high-temperature sintering process at 1300 DEG C-1440 DEG C, the size of pores in the green body is reduced, the number of the pores is reduced, and the porosity in a sintered body is 30-50%; and continuously increasing the temperature to 1450 DEG C-1600 DEG C to melt the steel, diffusing molten steel into the metal ceramic, filling the molten steel into the continuous pores in the metal ceramic, and forming metallurgical bonding between the steel and the metal ceramic to realize high bonding strength. The diffusion bonding method disclosed by the invention has the advantages of combination of sintering and diffusion bonding, no external pressure, simple process, distribution of steel metal phases from the interior of the metal ceramic to carbon steel, full diffusion, low residual stress and high bonding strength.

Description

technical field [0001] The invention relates to a connection method between a cermet material and steel, in particular to a diffusion connection method between Ti(C,N)-based cermet and steel without external pressure, which belongs to the field of welding. Background technique [0002] Ti(C,N)-based cermets are based on Ti(C,N), Ni / Co is the binder phase, and WC, Mo 2 C, TaC, VC, Cr 3 C 2 It is a multi-phase solid material made by powder metallurgy method to improve the properties of carbides. Ti(C,N)-based cermets have the advantages of high hardness and red hardness, low density, high wear resistance, corrosion resistance, and high temperature resistance. They have broad applications in cutting tools, mold industries, high temperature resistance, wear resistance and corrosion resistance environments. Application prospect. However, its strength and toughness are insufficient. Domestic and foreign studies have adopted the addition of Mo, the introduction of N, and ultra-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/10C22C1/05B22F7/06
Inventor 郭智兴熊计钟华万维财
Owner SICHUAN UNIV
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