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Sintering diffusion method for preparing iron-based surface composite material

A technology of surface composite materials and diffusion method, which is applied in the field of powder metallurgy and composite materials, can solve the problems of pores, inclusions, shrinkage and porosity of castings, etc., and achieve the effect of simple process and easy control of thickness

Inactive Publication Date: 2010-09-15
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the disadvantage of this method is that an intermediate transition layer is required
The casting infiltration method of the invention has the disadvantages that castings are prone to shrinkage, inclusions, pores and other defects, and the thickness of the casting infiltration layer is not easy to control.

Method used

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  • Sintering diffusion method for preparing iron-based surface composite material

Examples

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example 1

[0021] Example 1: Among the raw materials used for preparing the wear-resistant alloy steel mixed powder: the phosphorus-iron powder contains 16wt% of phosphorus, and the particle size is 10 μm; the copper powder contains 99.7wt% of copper, and the particle size is 15 μm; 2.5μm; the carbon black powder contains 99.6wt% carbon, and the particle size is 1.0μm; the composition of wear-resistant alloy steel is: C: 0.45wt%, Cu: 5wt%, P: 0.6wt%, Fe is the balance; the ball milling medium is without Water ethanol, its addition is 300ml, and ball milling speed is 60r / min, and grinding time is 48h, and grinding ball is the 1Cr18Ni9Ti stainless steel ball of Ф8mm, and ball material weight ratio is 2: 1, and adding polyethylene glycol 6000 is 1wt%; Iron After the base material is ball-milled, the slurry is vacuum-dried at a temperature of 85°C and a vacuum degree of 5Pa; pressed at 300MPa to form a green body with a height of 5.5mm, an outer diameter of 40mm, and an inner diameter of 32mm...

example 2

[0022] Example 2: Among the raw materials used for preparing wear-resistant alloy steel mixed powder: ferrophosphorus powder contains 16wt% of phosphorus and has a particle size of 10 μm; ferrochrome powder contains chromium 60wt% and has a particle size of 10 μm; ; Carbonyl iron powder contains 98.5wt% iron, particle size is 2.5μm; carbon black powder contains 99.6wt% carbon, particle size is 1.0μm; the composition of wear-resistant alloy steel is: C: 2.0wt%, Cr: 5wt%, Mo: 3wt% %, P: 0.5wt%, Fe is the balance; the ball milling medium is absolute ethanol, its dosage is 300ml, the ball milling speed is 80r / min, the milling time is 24h, the milling balls are Ф8mm 1Cr18Ni9Ti stainless steel balls, the weight of the balls The ratio is 2.5:1, adding polyethylene glycol 6000 is 1.5wt%; the vacuum drying treatment temperature of the iron-based material slurry after ball milling is 85 ° C, and the vacuum degree is 5 Pa; it is pressed under 350 MPa to a height of 6 mm and an outer diame...

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Abstract

The invention discloses a sintering diffusion method for preparing an iron-based surface composite material, which is characterized by comprising the steps of: firstly, preparing iron-based material green-pressing with a cylindrical hole at the center part by using a powder metallurgy method; secondly, placing a steel core bar with a certain size in the cylindrical hole of the green-pressing; and thirdly, carrying out vacuum sintering treatment on the iron-based material green-pressing and the steel core bar at a temperature of 900-1250 DEG C. The size contraction of the iron-based material green-pressing realizes compactness, and the hole diameter of the cylindrical hole at the center part is controlled to be less than the diameter of the steel core bar, thereby realizing the compact mechanical connection with the steel core bar. Meanwhile, the boundary parts in which the iron-based material is in contact with the steel core bar occur in mutual diffusion during the sintering, which ensures the metallurgical bonding of the surface iron-based material layer and the core steel. The invention has the advantages of simple process, low cost and compact bonding of a surface iron-based high-abrasive material and the internal steel.

Description

technical field [0001] The invention relates to a method for preparing iron-based surface composite materials, in particular to a sintering diffusion method for preparing iron-based surface composite materials, and belongs to the field of powder metallurgy and composite materials. Background technique [0002] With the rapid development of modern science and technology, many occasions in the industry require that the workpiece material on the mechanical equipment can withstand high temperature, high speed and severe wear conditions, and the friction parts are worn faster and faster. worn out and scrapped. Therefore, high requirements are placed on the comprehensive performance of the material. More and more studies have shown that wear-resistant materials need to have high hardness and high toughness at the same time. Although the overall composite improves the strength, it greatly reduces the toughness, and the wear only occurs on the specific surface of the part. In addi...

Claims

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Application Information

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IPC IPC(8): B22F7/04
Inventor 熊计郭智兴杨梅熊素建陈建中杨天恩
Owner SICHUAN UNIV