CN105256199A - Bearing material with high running-in performance and low friction coefficient - Google Patents

Abstract

The invention discloses a bearing material with high running-in performance and low friction coefficient. The bearing material is prepared from the following raw materials in parts by weight: 85-90 parts of aluminum, 5-8 parts of zinc, 3-4 parts of selenium, 1-2 parts of tin, 1-2 parts of silicon, 3-4 parts of polytetrafluoroethylene powder, 0.8-1.5 parts of molybdenum disulfide, 2-3 parts of stearic acid, 0.6-1 part of methylcellulose, 1-1.5 parts of graphite, 1.5-2 parts of polyvinyl chloride, 0.4-0.5 part of ferrous sulfate, 0.5-0.7 part of abrasion-resistant carbon black and a proper amount of oleic acid. The prepared bearing material is high in density, high in anti-seizure performance, high in running-in performance, wide in working temperature range, excellent in compactness, excellent in cutting and machining performance and few in defects of air holes and cracks, and is suitable for large-scale industrial production.

Description

The bearing materials that the frictional coefficient that a kind of running-in ability is high is low

Technical field

The present invention relates to powder metallurgical technology, particularly relate to the bearing materials that the high frictional coefficient of a kind of running-in ability is low.

Background technology

Metal sintering oil bearing is using metal-powder as raw material, the class agglomerated material made with powder metallurgical technique.Metal sintering oily preparation inherently porous, and have in the fabrication process can the quantity in free adjustment space, size and distribution advantage.Sintering metal oil bearing has been widely used in the various fields such as automobile, household electrical appliances, Transport Machinery, agricultural machine, instrument.The sintering metal oil bearing that modern industry mainly uses can be divided into copper base, iron-based, copper iron-based etc. by body material.Aluminium is one of the element the most widely that distributes in the earth's crust, and the content in the earth's crust is only second to oxygen and silicon, occupies the 3rd.In metal species, aluminium is the large metal of Equations of The Second Kind being only second to iron and steel.Aluminium is a kind of Industrial materials of widespread use, and fine aluminium is very soft, and intensity is not high, has good ductility, after adding the element such as copper, silicon, can effectively improve its mechanical property in aluminium.Aluminium base sliding surface bearing due to its density little, intensity is high, and rotproofness is good, and low cost and other advantages, and make it in some antifriction field, its Performance Ratio copper-based bearings material is more excellent.Although aluminum-based bearing material has a lot of excellent performance, but along with aluminum base powder metallurgy has the limitation of self, very large gap is also had from practical application, due to the problem in manufacturing process, the quality of burned product need to improve, and needs to improve performance scale operation further and expands its range of application.

Summary of the invention

The object of the invention is exactly the defect in order to make up prior art, provides the bearing materials that frictional coefficient that a kind of running-in ability is high is low.

The present invention is achieved by the following technical solutions:

The bearing materials that the frictional coefficient that running-in ability is high is low, is made up of the raw material of following weight part: aluminium 85-90, zinc 5-8, selenium 3-4, tin 1-2, silicon 1-2, polytetrafluoroethylene powder 3-4, molybdenumdisulphide 0.8-1.5, stearic acid 2-3, methylcellulose gum 0.6-1, graphite 1-1.5, polyvinyl chloride 1.5-2, ferrous sulfate 0.4-0.5, abrasion resistant carbon black 0.5-0.7, oleic acid are appropriate;

The bearing materials that the frictional coefficient that described a kind of running-in ability is high is low, be made up of following concrete steps:

(1) aluminium, zinc, selenium, tin and silica flour is poured in mortar ground and mixed even, again this mixed powder is added in ball mill, add appropriate alcohol and carry out wet ball grinding, ball milling speed is 20 revolutions per seconds, after ball milling 1-1.5h, mixed powder is added to placement after drying under 70 ° of C in vacuum drying oven for subsequent use;

(2) oleic acid and graphite mixing to be added in ultrasonic oscillation device ultrasonic disperse even, then to add mixed powder supersound process 30-45min prepared by step (1), for subsequent use after ultrasonic end solid-liquid separation;

(3) polytetrafluoroethylene powder is put into stirrer and mix 5-10min under 11000 revs/min, then add molybdenumdisulphide continuation mixing 10-15min, the powder mixed is placed in thermostatic drying chamber drying for standby under 80 ° of C;

(4) by stearic acid and methylcellulose gum Hybrid Heating, then add step (3) and all the other remaining mixing of materials stir, make particle, then mixed powder prepared by this particle and step (2) is added in mixer mixes;

(5) mixed powder prepared by step (4) is put into mould, pressure with 200-300Mpa in hydropress makes type, obtain green compact, green compact after shaping are sent in vacuum sintering furnace and sinters, agglomerating chamber's vacuum is 1.0 × 10-2-1.0 × 10-3Pa, sintering temperature heats up with the speed of 10 ° of C/min, is incubated 4-5 hour, cools to room temperature with the furnace afterwards when reaching 550-650 ° of C;

(6) blank prepared by step (5) is carried out surfacing, deburring process, then immersion oil can obtain bearing materials.

Advantage of the present invention is: the present invention adopts aluminium powder as matrix, add zinc, tin, selenium and silicon improve aluminium base intensity, relative density, porosity, the effect of crushing strength and reduction sintering temperature, the plasticity of aluminium is high, very easily be bonded on mould, cause demoulding difficulty, the present invention utilizes oleic acid and graphite to be mixed to form good adsorption and is coated on metal-powder surface, the problem that powder easily adheres to can be improved, the mixture of tetrafluoroethylene and molybdenumdisulphide is also adopted to make particle and metal powder mixed sintering, greatly strengthen the self-lubricity of aluminum-based bearing, reduce shrinkability, control pore size and the homogeneity of matrix, the polyvinyl chloride added, ferrous sulfate and abrasion resistant carbon black enhance the wear resistance of aluminum matrix composite, oilness, add friction reducing effect, bearing materials density prepared by the present invention is high, anti-seizing property is good, running-in ability is high, operating temperature range is wide, compactness is good, machinability is excellent, the defects such as pore crackle are few, can be used for large-scale commercial production.

Embodiment

The bearing materials that the frictional coefficient that running-in ability is high is low, is made up of the raw material of following weight part (kilogram): aluminium 85, zinc 5, selenium 3, tin 1, silicon 1, polytetrafluoroethylene powder 3, molybdenumdisulphide 0.8, stearic acid 2, methylcellulose gum 0.6, graphite 1, polyvinyl chloride 1.5, ferrous sulfate 0.4, abrasion resistant carbon black 0.5, oleic acid are appropriate;

The bearing materials that the frictional coefficient that described a kind of running-in ability is high is low, be made up of following concrete steps:

(1) aluminium, zinc, selenium, tin and silica flour is poured in mortar ground and mixed even, again this mixed powder is added in ball mill, add appropriate alcohol and carry out wet ball grinding, ball milling speed is 20 revolutions per seconds, after ball milling 1h, mixed powder is added to placement after drying under 70 ° of C in vacuum drying oven for subsequent use;

(2) oleic acid and graphite mixing to be added in ultrasonic oscillation device ultrasonic disperse even, then to add mixed powder supersound process 30min prepared by step (1), for subsequent use after ultrasonic end solid-liquid separation;

(3) polytetrafluoroethylene powder is put into stirrer and mix 5min under 11000 revs/min, then add molybdenumdisulphide continuation mixing 10min, the powder mixed is placed in thermostatic drying chamber drying for standby under 80 ° of C;

(4) by stearic acid and methylcellulose gum Hybrid Heating, then add step (3) and all the other remaining mixing of materials stir, make particle, then mixed powder prepared by this particle and step (2) is added in mixer mixes;

(5) mixed powder prepared by step (4) is put into mould, pressure with 200Mpa in hydropress makes type, obtain green compact, green compact after shaping are sent in vacuum sintering furnace and sinters, agglomerating chamber's vacuum is 1.0 × 10 × 10Pa, sintering temperature heats up with the speed of 10 ° of C/min, is incubated 4 hours, cools to room temperature with the furnace afterwards when reaching 550 ° of C;

(6) blank prepared by step (5) is carried out surfacing, deburring process, then immersion oil can obtain bearing materials.

Prepare volume aluminum-based bearing material according to embodiment, carry out performance test to it, result is as follows:

Vickers' hardness: 42, crushing strength: 191Mpa, tensile strength: 113Mpa, oleaginousness capacity: 21%.

Claims (2)

1. the bearing materials that the frictional coefficient that a running-in ability is high is low, it is characterized in that, be made up of the raw material of following weight part: aluminium 85-90, zinc 5-8, selenium 3-4, tin 1-2, silicon 1-2, polytetrafluoroethylene powder 3-4, molybdenumdisulphide 0.8-1.5, stearic acid 2-3, methylcellulose gum 0.6-1, graphite 1-1.5, polyvinyl chloride 1.5-2, ferrous sulfate 0.4-0.5, abrasion resistant carbon black 0.5-0.7, oleic acid are appropriate.

2. the bearing materials that the frictional coefficient that a kind of running-in ability is high is according to claim 1 low, is characterized in that, be made up of following concrete steps:

(1) aluminium, zinc, selenium, tin and silica flour is poured in mortar ground and mixed even, again this mixed powder is added in ball mill, add appropriate alcohol and carry out wet ball grinding, ball milling speed is 20 revolutions per seconds, after ball milling 1-1.5h, mixed powder is added to placement after drying under 70 ° of C in vacuum drying oven for subsequent use;

(2) oleic acid and graphite mixing to be added in ultrasonic oscillation device ultrasonic disperse even, then to add mixed powder supersound process 30-45min prepared by step (1), for subsequent use after ultrasonic end solid-liquid separation;

(3) polytetrafluoroethylene powder is put into stirrer and mix 5-10min under 11000 revs/min, then add molybdenumdisulphide continuation mixing 10-15min, the powder mixed is placed in thermostatic drying chamber drying for standby under 80 ° of C;

(4) by stearic acid and methylcellulose gum Hybrid Heating, then add step (3) and all the other remaining mixing of materials stir, make particle, then mixed powder prepared by this particle and step (2) is added in mixer mixes;

(5) mixed powder prepared by step (4) is put into mould, pressure with 200-300Mpa in hydropress makes type, obtain green compact, green compact after shaping are sent in vacuum sintering furnace and sinters, agglomerating chamber's vacuum is 1.0 × 10-2-1.0 × 10-3Pa, sintering temperature heats up with the speed of 10 ° of C/min, is incubated 4-5 hour, cools to room temperature with the furnace afterwards when reaching 550-650 ° of C;

(6) blank prepared by step (5) is carried out surfacing, deburring process, then immersion oil can obtain bearing materials.