CN102453826A

CN102453826A - Method for preparing powder metallurgy composite material

Info

Publication number: CN102453826A
Application number: CN201010522995XA
Authority: CN
Inventors: 刘芳; 林达文
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-10-28
Filing date: 2010-10-28
Publication date: 2012-05-16

Abstract

The invention provides a method for preparing a powder metallurgy composite material, which comprises the steps of proportioning, mixing, pressing, vacuum pressurized sintering, heat treatment and the like performed on 6-8% of Mo powder, 6-8% of W powder, 1.8-2% of C powder and the balance of Fe powder by weight. The powder metallurgy composite material prepared by using the method has good physical performance, the hardness (HRC) reaches 60-70, the bending strength reaches 1250-1400 MPa, and the impact toughness reaches 7.5-9 J.cm<-2>.

Description

The preparation method of composite powder metallurgy material

Technical field

The present invention relates to a kind of preparation method of composite powder metallurgy material.

Background technology

Its material not only needs high intensity and toughness in the use of cutting tool, also need under the high temperature more than the 800K, keep high hardness.Existing cutting tool adopts carbide material or rapid steel to make usually.Carbide material exists significant disadvantages, promptly is difficult to be processed into complicated cutting surface, and in working angles, collapses cutter easily because toughness is lower.Rapid steel has good toughness, but does not have the hot hardness and the wear resistance of carbide material.

Summary of the invention

The purpose of this invention is to provide a kind of existing excellent toughness and intensity, the preparation method of the composite powder metallurgy material of good hot hardness and wear resistance is arranged again.

In order to achieve the above object, the technical scheme that the present invention adopted may further comprise the steps:

A. be 6～8% Mo powder, 6～8% W powder, 1.8～2% C powder and the Fe powder batching of surplus with weight percent; Powder size is 100～200 orders; Add weight percent and be 0.1～1.0% lubricant and carry out ball mill mixing again, mixing time is 0.5～2 hour;

B. under the pressure of 500～600Mpa, suppress;

C. be 1200～1300 ℃ of following vacuum pressed sintering in temperature, pressure is 0.01～0.1Mpa, soaking time 1.5～2.5 hours;

D. be 950～1100 ℃ in temperature and quench soaking time 20～35 minutes down; In temperature is 450～600 ℃ of following tempering, soaking time 40～80 minutes.

As improvement of the present invention, said lubricant is a Zinic stearas.

As further improvement of the present invention, said vacuum pressed sintering is in vacuum degreasing sintered all-in-one oven, to carry out.

Adopt the composite powder metallurgy material of method for preparing to have good physicals, hardness (HRC) reaches 60～70, and bending strength reaches 1250～1400MPa, and impelling strength reaches 7.5～9Jcm ^-2

Embodiment

Embodiment one:

A. be 6% Mo powder, 7.8% W powder, 1.8% C powder and the Fe powder batching of surplus with weight percent, powder size is 100 orders, adds weight percent and is 0.1% lubricant and carry out ball mill mixing again, and mixing time is 0.5 hour;

B. under the pressure of 500Mpa, suppress;

C. be 1200 ℃ of following vacuum pressed sintering in temperature, pressure is 0.01Mpa, soaking time 2.5 hours, and the body of ventilating is a nitrogen;

D. be 950 ℃ in temperature and quench soaking time 20 minutes down; In temperature is 600 ℃ of following tempering, soaking time 40 minutes.

The composite powder metallurgy material of preparation has good physicals, and hardness (HRC) reaches 60, and bending strength reaches 1250MPa, and impelling strength reaches 7.5Jcm ^-2

Embodiment two:

A. be 8% Mo powder, 6% W powder, 2% C powder and the Fe powder batching of surplus with weight percent, powder size is 200 orders, adds weight percent and is 1.0% lubricant and carry out ball mill mixing again, and mixing time is 1.5 hours;

B. under the pressure of 600Mpa, suppress;

C. be 1300 ℃ of following vacuum pressed sintering in temperature, pressure is 0.01～0.1Mpa, soaking time 2.0 hours, and the body of ventilating is an argon gas;

D. be 1100 ℃ in temperature and quench soaking time 35 minutes down; In temperature is 450 ℃ of following tempering, soaking time 80 minutes.

The composite powder metallurgy material of preparation has good physicals, and hardness (HRC) reaches 65, and bending strength reaches 1350MPa, and impelling strength reaches 8.5Jcm ^-2

Embodiment three:

A. be 6.8% Mo powder, 8% W powder, 1.8% C powder and the Fe powder batching of surplus with weight percent, powder size is 150 orders, adds weight percent and is 0.8% Zinic stearas and carry out ball mill mixing again, and mixing time is 2 hours;

B. under the pressure of 560Mpa, suppress;

C. be 1270 ℃ of following vacuum pressed sintering in temperature, pressure is 0.01～0.1Mpa, soaking time 1.5 hours, and the body of ventilating is a nitrogen;

D. be 1000 ℃ in temperature and quench soaking time 28 minutes down; In temperature is 550 ℃ of following tempering, soaking time 60 minutes.

The composite powder metallurgy material of preparation has good physicals, and hardness (HRC) reaches 70, and bending strength reaches 1400MPa, and impelling strength reaches 9Jcm ^-2

Claims

1. the preparation method of a composite powder metallurgy material is characterized in that, may further comprise the steps:

B. under the pressure of 500～600Mpa, suppress;

2. according to the preparation method of the composite powder metallurgy material of claim 1, it is characterized in that said lubricant is a Zinic stearas.

3. according to the preparation method of the composite powder metallurgy material of claim 1, it is characterized in that said vacuum pressed body that sintering is ventilated is nitrogen or argon gas.