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Diffusion bonding method of ti(c,n) based cermets and steel without external pressure

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: 2015-08-05
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 of ti(c,n) based cermets and steel without external pressure

Examples

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example 1

[0016] Example 1: The particle size of Ni in the raw materials used to prepare Ti(C,N)-based cermets is 1.5 μm, that of Co is 1.3 μm, that of Fe is 2.0 μm, and that of Mo 2 The particle size of C is 1.5μm, TiC 0.7 N 0.3 The particle size is 1.8 μm. The weight percent of Ti(C,N)-based cermet composition is 5wt% for Ni, 5wt% for Co, 5wt% for Fe, Mo 2 C accounted 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, its dosage is 400ml, the ball milling speed is 60r / min, the milling time is 48h, the milling ball is Φ6mm WC-8wt%Ni cemented carbide ball, the weight ratio of ball to material 5:1, add 10wt% paraffin, 0.5wt% oleic acid, and 0.5wt% Tween 80 as a composite molding agent; after ball milling, the cermet slurry is filtered with 400 mesh, and the vacuum drying temperature is 85°C. The vacuum degree is 3 Pa; the pressure of the cermet porous green body is 200MPa when pressing, the cavity volume is fixed, an...

example 2

[0017] Example 2: The particle size of Ni in the raw materials used to prepare Ti(C,N)-based cermets is 1.2 μm, that of Co is 1.5 μm, and that of Mo 2 The particle size of C is 1.8μm, TiC 0.7 N 0.3 The particle size is 1.4μm; the composition weight percentage of Ti(C,N)-based cermet is 20wt% for Ni, 8wt% for Co, and 8wt% for Mo. 2 C accounted for 12wt%, TiC 0.7 N 0.3is the balance; the ball milling medium of the cermet mixed powder is No. 120 solvent oil, its dosage is 200ml, the ball milling speed is 90r / min, the milling time is 36h, and the milling ball is Φ8mm WC-8wt%Ni cemented carbide ball, The weight ratio of ball to material is 10:1, add 5wt% paraffin, 1wt% oleic acid, and 2% Tween 80 as composite molding 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 cermet porous green body is 100MPa, the cavity volume is fixed, and the porosity of the green body is...

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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 Patents(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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