CN103567435A - Powder metallurgy flange and preparation method thereof - Google Patents

Abstract

The invention discloses a powder metallurgy flange which is characterized by comprising the following raw materials in parts by weight: 1.2 to 1.4 parts of copper, 5.2 to 5.6 parts of chromium, 1.2 to 1.4 parts of manganese, 3.1 to 3.3 parts of silicone, 1.4 to 1.6 parts of graphite, 2.3 to 2.8 parts of zinc stearate, 0.12 to 0.15 part of Yb, 0.23 to 0.26 part of Lu, 1.0 to 1.2 parts of La, 3.0 to 3.2 parts of Ni, 92 to 94 parts of powdered iron and 1 to 2 parts of an additive. In the invention, according to different needs, adjustment to material composition can be performed, the microstructure of the produced flange is excellent, the pores are fewer, the structural rigidity, the hardness, the antifatigue performance and the tensile strength performance are excellent, and the powder metallurgy flange can be widely applied to various environments.

Description

Powder metallurgy flange and preparation method thereof

Technical field

The present invention relates to field of powder metallurgy, particularly a kind of powder metallurgy flange and preparation method thereof.

Background technology

Powder metallurgy be produce metal dust or with metal dust (or mixture of metal dust and non-metal powder) as raw material, through being shaped and sintering, produce the industrial technology of metal material, composite and all kinds goods.At present, PM technique has been widely used in the fields such as traffic, machinery, electronics, Aero-Space, weapons, biology, new forms of energy, information and nuclear industry, becomes one of branch of tool development vitality in new material science.That PM technique possesses is significantly energy-conservation, economize material, excellent performance, Product Precision is high and the series of advantages such as good stability, is very suitable for producing in enormous quantities.In addition, part material and the also available PM technique manufacture of complex parts that with conventional cast method and machining process, cannot prepare, thereby enjoy the attention of industrial quarters.Powder metallurgy structural part product material composition is not limited by melting, both can add alloying component, can add other structural constituent yet, and adjusts as requested in sizable scope, and then can reach the effect of mating with steel part in mechanical property.

Powder metallurgy mechanization degree is high, can reduce personnel, can raise the efficiency again, so that cost-saving.PM technique can replace traditional manufacturing process, for the vast traditional forms of enterprises cost-saving.

Existing most flange adopts casting technique to produce, and only have the flange of small part to adopt machining to form, and the program of machining is complicated.There is following defect in processing with in using in the flange of casting, its tensile strength of ferroalloy of casting use is lower than steel, and alloy internal organizational structure is loose, air-tightness is not high, in use when fracture easily appears when excessive in the pressure bearing or external force; On the other hand, the flange of casting has sand holes and pore, can not under high pressure use, otherwise have to leak, produces.Adopt steel to produce flange, need multiple working procedure just can complete, and have a large amount of waste materials to produce, production efficiency is low, is unfavorable for reducing production costs.

Summary of the invention

The object of this invention is to provide a kind of powder metallurgy flange and preparation method thereof, the flange of producing, can adjust material component as required, is extensively applicable to various environment.

In order to realize object of the present invention, the present invention passes through following scheme implementation:

A flange, is made by the raw material of following weight portion: copper 1.2-1.4, chromium 5.2-5.6, manganese 1.2-1.4, silicon 3.1-3.3, graphite 1.4-1.6, zinc stearate 2.3-2.8, Yb0.12-0.15, Lu0.23-0.26, La1.0-1.2, Ni3.0-3.2, iron powder 92-94, auxiliary agent 1-2;

Described auxiliary agent is made by the raw material of following weight portion: iron powder 3-4, zinc oxide 2-3, titanium dioxide 1-2, sodium metaphosphate 2-3, kaolin powder 5-6, aluminum nitride powder 1-2, Silane coupling agent KH550 2-3, chromium boride 5-6, maleic anhydride 2-3, dimethicone 1-2, aluminate coupling agent DL-411 2-3,cyanuric acid zinc 1-2; Preparation method mixes iron powder, zinc oxide, titanium dioxide, sodium metaphosphate, kaolin powder, aluminum nitride powder, grind to form 200-300 order powder, then add Silane coupling agent KH550 to mix, under 10-15Mpa, be pressed into blank, then, send at 920-950 ℃ and calcine 3-4 hour, cooling after, be ground into 300-400 order powder, mix with other residual components, be heated to 60-70 ℃, under 1200-1500 rev/min, stir 1-2 hour, obtain.

Described powder metallurgy flange, by following concrete steps, made:

(1) copper, chromium, manganese, iron powder are mixed, add in suitable quantity of water, send into ball milling in ball mill, obtain 250-400 order powder, then, spraying is dry, oven dry, under 10-13Mpa pressure, is pressed into bulk, then under nitrogen protection atmosphere 500-550 ℃ carry out sintering 9-10 hour, will be after the crushing material after sintering cross 200-400 mesh sieve;

(2) other residual components is mixed;

(3) at 58-63 ℃, after mixing and stirring 75-95 minute, pack step (1), (2) material into mould, be pressed into base;

(4) pressed compact is placed in sintering furnace, with 6-8 ℃/min of speed, is warming up to sintering 1.5-2 hour under 800-850 ℃ of condition; Then with 5-7 ℃/min of speed, be warming up to sintering 2-3 hour under 1050-1150 ℃ of condition; With 8-12 ℃/min of speed, be cooled to sintering 1-2 hour under 450-550 ℃ of condition again, in last air, be cooled to room temperature.

The present invention's difference as required, adjusts the composition of material, and the flange microstructure of production is good, and seldom, the rigidity of structure, hardness, fatigue performance, tensile strength properties are good, are extensively adapted to each environment for hole.

Specific embodiments

Below by instantiation, the present invention is described in detail.

A flange, by following weight portion (kilogram) raw material make: copper 1.2, chromium 5.2, manganese 1.2, silicon 3.1, graphite 1.4, zinc stearate 2.3, Yb0.12, Lu0.23, La1.0, Ni3.0, iron powder 92, auxiliary agent 1;

Described auxiliary agent by following weight portion (kilogram) raw material make: iron powder 4, zinc oxide 2, titanium dioxide 2, sodium metaphosphate 2, kaolin powder 6, aluminum nitride powder 1, Silane coupling agent KH550 3, chromium boride 6, maleic anhydride 2, dimethicone 2, aluminate coupling agent DL-411 3,cyanuric acid zinc 2; Preparation method mixes iron powder, zinc oxide, titanium dioxide, sodium metaphosphate, kaolin powder, aluminum nitride powder, grind to form 200-300 order powder, then add Silane coupling agent KH550 to mix, under 10-15Mpa, be pressed into blank, then, send at 920-950 ℃ and calcine 3-4 hour, cooling after, be ground into 300-400 order powder, mix with other residual components, be heated to 60-70 ℃, under 1200-1500 rev/min, stir 1-2 hour, obtain.Described powder metallurgy flange, by following concrete steps, made:

(1) copper, chromium, manganese, iron powder are mixed, add in suitable quantity of water, send into ball milling in ball mill, obtain 250-400 order powder, then, spraying is dry, oven dry, under 10-13Mpa pressure, is pressed into bulk, then under nitrogen protection atmosphere 500-550 ℃ carry out sintering 9-10 hour, will be after the crushing material after sintering cross 200-400 mesh sieve;

(2) other residual components is mixed;

(3) at 58-63 ℃, after mixing and stirring 75-95 minute, pack step (1), (2) material into mould, be pressed into base;

(4) pressed compact is placed in sintering furnace, with 6-8 ℃/min of speed, is warming up to sintering 1.5-2 hour under 800-850 ℃ of condition; Then with 5-7 ℃/min of speed, be warming up to sintering 2-3 hour under 1050-1150 ℃ of condition; With 8-12 ℃/min of speed, be cooled to sintering 1-2 hour under 450-550 ℃ of condition again, in last air, be cooled to room temperature.

Through detection, the hardness of flange of the present invention: HRC56; Tensile strength: 1180MPa.

Claims (2)

1. a powder metallurgy flange, it is characterized in that, by the raw material of following weight portion, made: copper 1.2-1.4, chromium 5.2-5.6, manganese 1.2-1.4, silicon 3.1-3.3, graphite 1.4-1.6, zinc stearate 2.3-2.8, Yb0.12-0.15, Lu0.23-0.26, La1.0-1.2, Ni3.0-3.2, iron powder 92-94, auxiliary agent 1-2;

Described auxiliary agent is made by the raw material of following weight portion: iron powder 3-4, zinc oxide 2-3, titanium dioxide 1-2, sodium metaphosphate 2-3, kaolin powder 5-6, aluminum nitride powder 1-2, Silane coupling agent KH550 2-3, chromium boride 5-6, maleic anhydride 2-3, dimethicone 1-2, aluminate coupling agent DL-411 2-3,cyanuric acid zinc 1-2; Preparation method mixes iron powder, zinc oxide, titanium dioxide, sodium metaphosphate, kaolin powder, aluminum nitride powder, grind to form 200-300 order powder, then add Silane coupling agent KH550 to mix, under 10-15Mpa, be pressed into blank, then, send at 920-950 ℃ and calcine 3-4 hour, cooling after, be ground into 300-400 order powder, mix with other residual components, be heated to 60-70 ℃, under 1200-1500 rev/min, stir 1-2 hour, obtain.

2. powder metallurgy flange according to claim 1, is characterized in that, by following concrete steps, is made:

(1) copper, chromium, manganese, iron powder are mixed, add in suitable quantity of water, send into ball milling in ball mill, obtain 250-400 order powder, then, spraying is dry, oven dry, under 10-13Mpa pressure, is pressed into bulk, then under nitrogen protection atmosphere 500-550 ℃ carry out sintering 9-10 hour, will be after the crushing material after sintering cross 200-400 mesh sieve;

(2) other residual components is mixed;

(3) at 58-63 ℃, after mixing and stirring 75-95 minute, pack step (1), (2) material into mould, be pressed into base;

(4) pressed compact is placed in sintering furnace, with 6-8 ℃/min of speed, is warming up to sintering 1.5-2 hour under 800-850 ℃ of condition; Then with 5-7 ℃/min of speed, be warming up to sintering 2-3 hour under 1050-1150 ℃ of condition; With 8-12 ℃/min of speed, be cooled to sintering 1-2 hour under 450-550 ℃ of condition again, in last air, be cooled to room temperature.