CN103938017A - Copper-based powder metallurgy tool steel and manufacturing method thereof - Google Patents

Abstract

The invention discloses copper-based powder metallurgy tool steel and a manufacturing method thereof. An atomized copper powder is employed as a substrate and other raw materials comprises, by weight, 10-12% of copper oxide, 5-7% of iron powder, 3-5% of zinc powder, 1-3% of nickel powder, 2-3% of silicon dioxide, 0.1-0.3% of boron oxide, 0.2-0.3% of nickel oxide, 0.4-0.6% of nano niobium powder, 0.2-0.4% of titanium dioxide, 0.01-0.03% of palladium oxide, 0.01-0.02% of scandium oxide, 0.5-0.6% of polyethylene wax and 0.2-0.4% of zine stearate. By employing the atomized copper powder as a substrate and various metal powders and various metal oxide powders as raw materials, the tool steel, which is manufactured by means of respectively pre-burning and grinding processes, is high in performance index, is good in glossiness and stability, is not liable to fracture, is long in service life and has a wide application scope.

Description

A kind of copper-base powder metallurgy tool steel and preparation method thereof

Technical field

The present invention relates to a kind of powder metallurgical technology, be specifically related to a kind of copper-base powder metallurgy tool steel and preparation method thereof.

Background technology

Powder metallurgy is to produce metal-powder and pass through the techniques such as mixing, moulding by the working method of the mixture making articles of metal-powder and non-metal powder, tool steel is the vitals of automobile, at present, tool steel is commonly used casting method moulding, but there are many problems, for example: cast formula is unreasonable, and the hardness of product, intensity, unit elongation do not reach requirement etc.

Summary of the invention

The object of the present invention is to provide a kind of copper-base powder metallurgy tool steel and preparation method thereof.

The present invention adopts following technical scheme to achieve these goals:

Copper-base powder metallurgy tool steel, taking atomized copper powder as matrix, the weight percentage of other constitutive materials is cupric oxide 10-12, iron powder 5-7, zinc powder 3-5, nickel powder 1-3, silicon-dioxide 2-3, boron oxide 0.1-0.3, nickel oxide 0.2-0.3, nanometer niobium powder 0.4-0.6, titanium dioxide 0.2-0.4, palladous oxide 0.01-0.03, Scium trioxide 0.01-0.02 and polyethylene wax 0.5-0.6 and Zinic stearas 0.2-0.4.

Copper-base powder metallurgy tool steel, taking atomized copper powder as matrix, the weight percentage of other constitutive materials is cupric oxide 11, iron powder 6, zinc powder 4, nickel powder 2, silicon-dioxide 2.5, boron oxide 0.2, nickel oxide 0.25, nanometer niobium powder 0.5, titanium dioxide 0.3, palladous oxide 0.02, Scium trioxide 0.015 and polyethylene wax 0.55 and Zinic stearas 0.3.

The making method of copper-base powder metallurgy tool steel, comprises the following steps:

(1) take each raw material by the weight percentage of constitutive material, first atomized copper powder, cupric oxide, iron powder, zinc powder, nickel powder and silicon-dioxide are mixed, then send into rotary kiln pre-burning, at room temperature pass through 2-3 hour, be warming up to 500-550 DEG C, insulation batch mixing 2-3 hour; Pass through 1-1.5 hour again, be warming up to 700-800 DEG C, insulation batch mixing 1-2 hour, obtains compound A;

(2) percentage composition mixes boron oxide, nickel oxide, nanometer niobium powder, titanium dioxide, palladous oxide and Scium trioxide by weight, sends into rotary kiln pre-burning, at room temperature passes through 2-3 hour, is warming up to 580-650 DEG C, insulation batch mixing 2-3 hour; Pass through 1-1.5 hour again, be warming up to 730-850 DEG C, insulation batch mixing 1-2 hour, obtains compound B;

(3) the compound B of the compound A of step (1) and step (2) is ground respectively to slurrying, grinding medium is the ethanol aqueous solution of 15-20%, then mix both mixed slurries, then add wherein polyethylene wax and Zinic stearas; Be uniformly mixed, then it is dry to spray;

(4) the spray-dired compound of step (3) is placed in to mould, compression moulding obtain pressed compact under 300-600MPa pressure, again pressed compact is placed in to net strip sintering furnace and carries out sintering, sintering atmosphere is nitrogen atmosphere, in sintering process, first pressed compact passes through the preheating zone of 500-600 DEG C, be 1-2h warm up time, then enters the sintering zone of 950-1050 DEG C, insulation 1.5-2.5h, finally at the cooling 1-1.5h of cooling zone to room temperature, obtain sintered compact;

(5) step (4) sintered compact is suppressed to shaping and obtained casting die with pressing mold, coldly go and get final product.

Beneficial effect of the present invention:

It is matrix that the present invention adopts atomized copper powder, and various metals powder and oxidized metal powder are raw material, coordinates pre-burning respectively and grinds making method, make the product performance index produced high, glossiness is good, good stability, be not prone to the phenomenons such as fracture, long service life, applied widely.

Embodiment

Embodiment 1: copper-base powder metallurgy tool steel, taking atomized copper powder as matrix, the weight percentage of other constitutive materials is cupric oxide 11, iron powder 6, zinc powder 4, nickel powder 2, silicon-dioxide 2.5, boron oxide 0.2, nickel oxide 0.25, nanometer niobium powder 0.5, titanium dioxide 0.3, palladous oxide 0.02, Scium trioxide 0.015 and polyethylene wax 0.55 and Zinic stearas 0.3.

The making method of copper-base powder metallurgy tool steel, comprises the following steps:

(1) take each raw material by the weight percentage of constitutive material, first atomized copper powder, cupric oxide, iron powder, zinc powder, nickel powder and silicon-dioxide are mixed, then send into rotary kiln pre-burning, at room temperature through 2.5 hours, be warming up to 520 DEG C, insulation batch mixing 2.5 hours; Through 1.2 hours, be warming up to 750 DEG C again, insulation batch mixing 1-2 hour, obtains compound A;

(2) percentage composition mixes boron oxide, nickel oxide, nanometer niobium powder, titanium dioxide, palladous oxide and Scium trioxide by weight, sends into rotary kiln pre-burning, at room temperature passes through 2-3 hour, is warming up to 600 DEG C, insulation batch mixing 2-3 hour; Pass through 1-1.5 hour again, be warming up to 780 DEG C, insulation batch mixing 1-2 hour, obtains compound B;

(3) the compound B of the compound A of step (1) and step (2) is ground respectively to slurrying, grinding medium is 15% ethanol aqueous solution, then mix both mixed slurries, then add wherein polyethylene wax and Zinic stearas; Be uniformly mixed, then it is dry to spray;

(4) the spray-dired compound of step (3) is placed in to mould, compression moulding obtain pressed compact under 450MPa pressure, again pressed compact is placed in to net strip sintering furnace and carries out sintering, sintering atmosphere is nitrogen atmosphere, in sintering process, pressed compact is first through the preheating zone of 550 DEG C, be 1-2h warm up time, then enters the sintering zone of 1000 DEG C, insulation 2h, finally at the cooling 1.5h of cooling zone to room temperature, obtain sintered compact;

(5) step (4) sintered compact is suppressed to shaping and obtained casting die with pressing mold, coldly go and get final product.

The gear making by the present invention, experiment quality product performance is as follows:

Mean density>=7.28gcm ³, tensile strength > 680Mpa, heat treatment hardness: HRC57, qualification rate>=98%, scale error is in 0.01mm.

Claims (3)

1. a copper-base powder metallurgy tool steel, it is characterized in that: taking atomized copper powder as matrix, the weight percentage of other constitutive materials is cupric oxide 10-12, iron powder 5-7, zinc powder 3-5, nickel powder 1-3, silicon-dioxide 2-3, boron oxide 0.1-0.3, nickel oxide 0.2-0.3, nanometer niobium powder 0.4-0.6, titanium dioxide 0.2-0.4, palladous oxide 0.01-0.03, Scium trioxide 0.01-0.02 and polyethylene wax 0.5-0.6 and Zinic stearas 0.2-0.4.

2. copper-base powder metallurgy tool steel according to claim 1, it is characterized in that: taking atomized copper powder as matrix, the weight percentage of other constitutive materials is cupric oxide 11, iron powder 6, zinc powder 4, nickel powder 2, silicon-dioxide 2.5, boron oxide 0.2, nickel oxide 0.25, nanometer niobium powder 0.5, titanium dioxide 0.3, palladous oxide 0.02, Scium trioxide 0.015 and polyethylene wax 0.55 and Zinic stearas 0.3.

3. a making method for copper-base powder metallurgy tool steel as claimed in claim 1, is characterized in that comprising the following steps:

(1) take each raw material by the weight percentage of constitutive material, first atomized copper powder, cupric oxide, iron powder, zinc powder, nickel powder and silicon-dioxide are mixed, then send into rotary kiln pre-burning, at room temperature pass through 2-3 hour, be warming up to 500-550 DEG C, insulation batch mixing 2-3 hour; Pass through 1-1.5 hour again, be warming up to 700-800 DEG C, insulation batch mixing 1-2 hour, obtains compound A;

(2) percentage composition mixes boron oxide, nickel oxide, nanometer niobium powder, titanium dioxide, palladous oxide and Scium trioxide by weight, sends into rotary kiln pre-burning, at room temperature passes through 2-3 hour, is warming up to 580-650 DEG C, insulation batch mixing 2-3 hour; Pass through 1-1.5 hour again, be warming up to 730-850 DEG C, insulation batch mixing 1-2 hour, obtains compound B;

(3) the compound B of the compound A of step (1) and step (2) is ground respectively to slurrying, grinding medium is the ethanol aqueous solution of 15-20%, then mix both mixed slurries, then add wherein polyethylene wax and Zinic stearas; Be uniformly mixed, then it is dry to spray;

(4) the spray-dired compound of step (3) is placed in to mould, compression moulding obtain pressed compact under 300-600MPa pressure, again pressed compact is placed in to net strip sintering furnace and carries out sintering, sintering atmosphere is nitrogen atmosphere, in sintering process, first pressed compact passes through the preheating zone of 500-600 DEG C, be 1-2h warm up time, then enters the sintering zone of 950-1050 DEG C, insulation 1.5-2.5h, finally at the cooling 1-1.5h of cooling zone to room temperature, obtain sintered compact;

(5) step (4) sintered compact is suppressed to shaping and obtained casting die with pressing mold, coldly go and get final product.