CN101619406B - High-temperature nickel-based self-lubricating material and preparation method thereof - Google Patents
High-temperature nickel-based self-lubricating material and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a high-temperature nickel-based self-lubricating material and a preparation method thereof. The high-temperature nickel-based self-lubricating material is prepared by mixing 5-15 calcium fluoride powder, 40-60 copper powder and 25-55 nickel powder in percentage by weight, palletizing, pressing, sintering, processing surfaces, and the like and has the advantages of high mechanical strength, low friction coefficient, good wearing resistance, uniform texture, stable performance, good reproducibility, easy mechanical processing, high rate of finished products, good corrosion resistance and weldability, and the like. The invention is suitable for severe conditions of high temperature and vacuum, strong radiation and corrosion, and the like in a plurality of fields of aviation, aerospace, machinery, electrons, nuclear industry, and the like.
Description
Technical field
The invention belongs to a kind of mmaterial and preparation method thereof, be specifically related to a kind of high-temperature nickel-based self-lubricating material and preparation method thereof.
Background technology
In the self-lubricating material field, with nickel or alloy as matrix, with moly-sulfide (MoS
2), the matrix material formed of graphite and soft metal silver solid lubricants such as (Ag), can make the metal-based self-lubricating material that in high temperature, high vacuum or inert atmosphere, uses.In this class material, usually need in nickel or alloy, add the multiple solid lubricant of rational proportion, as nickelalloy: graphite: silver=75: 15: 15, thus obtain good room temperature and high-temperature comprehensive property, i.e. high mechanical strength, low-friction coefficient and high-wearing feature.
Industrial circle needs a kind of high temperature self-lubricating composite, not only need have favorable mechanical performance and tribological property, also need have excellent corrosion resisting performance in the fluoride gas medium, and and copper-based material between good welding property.Because existing nickel-based solid self-lubricating material can't satisfy the above-mentioned functions requirement, therefore need a kind of type material of research and development.
Solid lubricant Calcium Fluoride (Fluorspan) (CaF
2) film frictional coefficient when room temperature be 0.4, experience is by the transformation of fragility to plasticity in the time of about 500 ℃, make it can both play lubrication from 500～1000 ℃, in the temperature range of room temperature to 1000 ℃, frictional coefficient all remains between 0.2～0.5, thereby have good room temperature and high Temperature Tribological characteristic, it has higher corrosion resistance in the gaseous corrosion medium of fluorochemical simultaneously.Make matrix with nickel, copper in addition and can guarantee welding property between material and copper-based material.Thereby existence is added Calcium Fluoride (Fluorspan) to possibility that corronel is invented a kind of novel material as a kind of high temperature lubricant.
Summary of the invention
The present invention is in order to overcome the deficiency of existing nickel-base high-temperature self-lubricating material, its objective is that providing a kind of has good tribological property and mechanical property under high temperature, high vacuum, severe corrosive condition, have high-temperature nickel-based self-lubricating material of good welding property and preparation method thereof simultaneously.
Embodiment
Below, with reference to drawings and Examples a kind of high-temperature nickel-based self-lubricating material of the present invention and preparation method thereof is elaborated:
A kind of high-temperature nickel-based self-lubricating material comprises
Calcium Fluoride (Fluorspan) (CaF
2): 5%～15% weight ratio, powdery, granularity: 300～500 orders
Nickel (Ni): 40%～60% weight ratio, powdery, granularity: 100～300 orders
Copper (Cu): 25%～55% weight ratio, powdery, granularity: 100～300 orders
A kind of preparation method of high-temperature nickel-based self-lubricating material may further comprise the steps:
(i) mix: after above Calcium Fluoride (Fluorspan), nickel and three kinds of powder of copper are prepared according to aforementioned proportion, mix in mixed powder machine, mixing time 3～20 hours obtains homodisperse mixed powder;
(ii) sintering: mixed powder is packed in the graphite jig, carry out sintering in the vacuum heating-press sintering stove, sintering temperature is 1000～1250 ℃, and the sintering oven internal pressure is 3～15MPa, and sintering time 10～100 minutes is with the stove naturally cooling.
Sintering finishes the back demoulding and is the product blank.
Mix the powder machine and adopt the GH-5 three-dimensional motion to mix the powder machine, the vacuum heating-press sintering stove adopts ZRYS-vacuum heating-press sintering stove.
The characteristics of present method are: mixed powder is directly imported in the mould hot-forming, the product after the moulding can be a different shape, if dimension precision requirement is higher, needs following process.
Another kind of high-temperature nickel-based white and moist sliding preparation methods may further comprise the steps:
(i) mix: after above Calcium Fluoride (Fluorspan), nickel and three kinds of powder of copper are prepared according to aforementioned proportion, mix in mixed powder machine, mixing time 3～20 hours obtains homodisperse mixed powder.
(ii) granulate: powder mix is mixed with the part by weight of caking agent according to 10: 1, carry out wet ball grinding in ball mill, the mixed slurry that obtains behind the ball milling is transported in the centrifugal granulating drying machine granulates, the processing parameter of centrifugal granulating drying machine is:
Inlet temperature: 200～300 ℃ of temperature outs: 100～200 ℃
Feeding speed: 8～20rpm
Obtaining mobile after the screening in the earthquake sieve is 1.20～1.60g/cm less than 60 seconds/2.5mm hole and loose density
3Granulated powders.
Wherein, caking agent adopts low polymerization degree 10% water-sol of polyvinyl alcohol (PVA), and ball mill adopts the SX-8 ball mill, and the centrifugal granulating drying machine adopts GL-5 centrifugal granulating drying machine.
(iii) compression moulding: granulated powders is placed graphite jig, suppress the pressed compact of size basically identical with pressing machine.
Forming pressure is that 4～25kN pressing speed is 10～20 times/minute;
Wherein, pressing machine adopts DP25-II full-automatic dry powder pressing machine.
(iv) sintering: pressed compact is carried out sintering in vacuum sintering furnace
Sintering temperature: 1000～1250 ℃ of sintering times: 1～5 hour
After sintering is finished,, obtain work in-process with the stove naturally cooling.Wherein, vacuum sintering furnace adopts VF-II-100 vacuum sintering furnace.
(v) surface treatment: work in-process are polished grinding in the polishing shredder
The rotating speed of polishing shredder is: 500～1000rpm
The polishing milling time is: 10～60 minutes
Surface treatment is to guarantee the requirement of accessory size.Wherein, the polishing shredder adopts the centrifugal polishing shredder of XW-30.
The characteristics of present method are: with the granulation that atomizes of mixed powder, import in the mould then and suppress, last sintering forms, and the product size control accuracy after the moulding is higher, need not following process.
The accessible performance index of described nickel-base high-temperature self-lubricating material see Table 1.
Performance index
Table 1
Advantages such as shown in table 1, nickel-base high-temperature self-lubricating material of the present invention possesses the physical strength height, frictional coefficient is low, wear resistance good, homogeneous microstructure, stable performance, favorable reproducibility, easily mechanical workout, yield rate height, good corrosion resistance and weldability be good.This material has good solidity to corrosion in the fluoride gas medium, can reach more than the 300N with copper-based material welding back bonding force.
Claims (3)
1. the preparation method of a high-temperature nickel-based self-lubricating material, its component and weight proportion are: Calcium Fluoride (Fluorspan) 5%～15%; Nickel 40%～60%; Copper 25%～55%; Wherein, Calcium Fluoride (Fluorspan) is powdery, and granularity is 300～500 orders; Nickel is powdery, and granularity is 100～300 orders; Copper is powdery, and granularity is 100～300 orders, it is characterized in that: may further comprise the steps:
(i) mix: after the ratio preparation according to above-mentioned Calcium Fluoride (Fluorspan), nickel and three kinds of powder of copper, mix in mixed powder machine, mixing time 3～20 hours obtains homodisperse mixed powder;
(ii) granulate: powder mix is mixed with the part by weight of caking agent according to 10: 1, carry out wet ball grinding in ball mill, the mixed slurry that obtains behind the ball milling is transported in the centrifugal granulating drying machine granulates, the processing parameter of centrifugal granulating drying machine is:
Inlet temperature: 200～300 ℃ of temperature outs: 100～200 ℃
Feeding speed: 8～20rpm
Obtaining mobile after the screening in the earthquake sieve is 1.20～1.60g/cm less than 60 seconds/2.5mm hole and loose density
3Granulated powders;
(iii) compression moulding: granulated powders is placed graphite jig, suppress the pressed compact of size basically identical with pressing machine
Forming pressure is that 4～25kN pressing speed is 10～20 times/minute;
(iv) sintering: pressed compact is carried out sintering in vacuum sintering furnace
Sintering temperature: 1000～1250 ℃ of sintering times: after sintering was finished in 1～5 hour,, obtain work in-process with the stove naturally cooling;
(v) surface treatment: work in-process are polished grinding in the polishing shredder
The rotating speed of polishing shredder is: 500～1000rpm
The polishing milling time is: 10～60 minutes.
2. the preparation method of high-temperature nickel-based self-lubricating material according to claim 1 is characterized in that: low polymerization degree 10% water-sol of caking agent employing polyvinyl alcohol.
3. the preparation method of high-temperature nickel-based self-lubricating material according to claim 1, it is characterized in that: ball mill adopts the SX-8 ball mill, the centrifugal granulating drying machine adopts GL-5 centrifugal granulating drying machine, pressing machine adopts DP25-II full-automatic dry powder pressing machine, vacuum sintering furnace adopts VF-II-100 vacuum sintering furnace, and the polishing shredder adopts the centrifugal polishing shredder of XW-30.
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| CN102925731A (en) * | 2012-11-16 | 2013-02-13 | 天津大学 | Powder metallurgy preparation method for improving performance of copper alloy graphite composite material |
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| CN101791701A (en) * | 2010-02-11 | 2010-08-04 | 中核(天津)科技发展有限公司 | Shaping method of nickel-base high-temperature self-lubricating material |
| CN102190911A (en) * | 2010-03-09 | 2011-09-21 | 中国科学院上海硅酸盐研究所 | Tungsten cobalt carbide-copper-fluoride self-lubricating wear-resistant coating and preparation method thereof |
| CN102041466B (en) * | 2010-07-30 | 2012-11-07 | 中国科学院金属研究所 | Preparation method of high-performance high temperature solid self-lubricating coating |
| KR101980728B1 (en) * | 2015-07-14 | 2019-05-21 | 주식회사 엘지화학 | Conductive structure body, method for manufacturing thereof, touch panel comprising thereof and display device comprising thereof |
| CN105986147B (en) * | 2016-07-26 | 2017-12-22 | 中国科学院兰州化学物理研究所 | A kind of wide temperature range self-lubricating nickel-based composite and preparation method thereof |
| CN106222474B (en) * | 2016-08-29 | 2017-11-10 | 昆明理工大学 | A kind of preparation method of silver-colored molybdenum sulfide sliding contact material |
| CN110885936B (en) * | 2018-09-07 | 2021-07-16 | 中核新科（天津）精密机械制造有限公司 | Sintering method of nickel-based self-lubricating material |
| CN113249619B (en) * | 2021-06-24 | 2021-11-02 | 北京科技大学 | Matrix component design method of delta-phase reinforced nickel-based superalloy |
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| CN102925731A (en) * | 2012-11-16 | 2013-02-13 | 天津大学 | Powder metallurgy preparation method for improving performance of copper alloy graphite composite material |
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Address after: 300384 Tianjin hi tech District of Xiqing City Huayuan Industrial Zone Development six road No. 6 Haitai green industry base building J room 104 Patentee after: China core (Tianjin) New Technology Development Co., Ltd. Address before: The 300384 Tianjin City Huayuan Industrial Zone Development Road six No. 6 Haitai green industry base building J room 104 Patentee before: Huahe New Technology Development Company, Research Institute of Physical and Chemical Engineering of Nuclear Industry |
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