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A high-strength and high-self-lubricating iron-based alloy, its preparation method and application

An iron-based alloy, self-lubricating technology, applied in the direction of fluid pressure actuation device, etc., can solve the problems of self-lubrication of oil cylinder bushing, poor friction and wear performance, inability to batch automatic production, complex manufacturing process, etc., to improve the metallographic phase of the alloy The effect of structure, easy batching, and reasonable alloy composition design

Active Publication Date: 2019-05-03
湖南屹林材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Boring and graphite filling are two processes, the operation is complicated, the processing efficiency is low, and the quality is difficult to control
[0005] The oil cylinder bushing manufactured by the above method has poor self-lubrication, friction and wear performance, complicated manufacturing process, unable to batch automatic production, and high manufacturing cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Iron powder, graphite powder, copper powder, molybdenum powder, nickel powder, yttrium powder, tungsten powder are weighed according to the ratio of 78.7:1:14:0.8:4:0.3:1.2, add 0.6% superforming agent (described The superforming agent is the superforming agent of skz-800 produced by Guangzhou Qingfanxiang New Material Co., Ltd.), mixed in a "V" type mixer for 1.5 hours as required; Formed under pressure. Control the density to 6.6g / m3 to obtain the bushing blank; heat the bushing blank to 1000°C for 1 hour in the atmosphere of decomposing ammonia, and cool it with the furnace to obtain the pre-alloyed bushing blank; then pre-alloyed the bushing blank Put it in an atmosphere of decomposed ammonia and heat it up to 1080°C for 3 hours, then raise the temperature to 1250°C for 1 hour, cool down with the furnace to obtain a sintered green body, place the sintered green body under a vacuum condition of 10mmHg, and impregnate it at 80°C Lubricating oil, take it out after kee...

Embodiment 2

[0070] Weigh iron powder, graphite powder, copper powder, molybdenum powder, nickel powder, and chromium powder according to the ratio of 67.8:0.3:28:0.1:3:0.8, add 0.9% zinc stearate forming agent, and place them in " Mix for 1.5 hours in a V"-shaped mixing cylinder to obtain a molding powder; shape it in a shaft sleeve molding mold under a pressure of 450MPa. The density of the compact is 6.4g / cm3; the compact is placed in a decomposed ammonia / nitrogen-based atmosphere environment and the temperature is raised to 750°C (the ratio of decomposed ammonia / nitrogen-based atmosphere is 1:4) and kept for 2 hours, then cooled with the furnace to obtain a pre-alloyed Shaft sleeve green body; place the green body in a decomposed ammonia / nitrogen-based atmosphere, heat it up to 1090°C for 1 hour with the furnace, then raise the temperature to 1180°C for 2 hours, and cool it with the furnace to obtain the required sintered green body; The sintered green body is placed under a vacuum con...

Embodiment 3

[0072] Weigh iron powder, graphite powder, copper powder, molybdenum powder, nickel powder, yttrium powder, neodymium powder, tungsten powder, chromium powder according to the ratio of 77.4:0.8:20:0.1:0.3:0.2:0.2:0.6:0.4, Add 0.7% paraffin wax forming agent, mix in "V" type mixing cylinder for 1.5 hours as required to obtain forming powder; form under 550MPa pressure in the sleeve forming mold. The density of the compact is 6.5g / cm3; the compact is placed in an atmosphere of decomposed ammonia, and the temperature is raised to 900°C for 2 hours, and then cooled with the furnace to obtain a pre-alloyed shaft sleeve body; the green body is placed in an atmosphere of decomposed ammonia , with the furnace heating up to 1090°C for 1 hour, then heating up to 1100°C for 3 hours and cooling in the furnace to obtain the required sintered green body; place the sintered green body under 30mmHg vacuum condition, impregnate 100°C lubricating oil, keep the immersion oil Take it out after 30...

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Abstract

The invention relates to high-strength high-self-lubrication iron-base alloy as well as a preparation method and application thereof. The iron-base alloy is prepared from the following ingredients inpercentage by mass: 14 to 28 percent of copper, 0.3 to 1 percent of graphite, 0.1 to 0.8 percent of molybdenum, 0.3 to 4 percent of nickel, 0 to 0.6 percent of manganese, 0 to 0.5 percent of vanadium,0 to 0.4 percent of rare earth, 0 to 1.2 percent of tungsten, 0 to 0.8 percent of chromium and the balance iron. The preparation method comprises the steps of forming mold preparation, material preparation, formation, presintering, sintering, vacuum oil immersion and machining. The designed and prepared iron-base alloy is particularly applicable to an oil cylinder shaft sleeve of engineering machinery. The alloy ingredient design is reasonable; the processing process is simple; the batch, large-scale and automatic production can be easily realized; the production efficiency can be improved; the energy sources are saved; the cost is reduced. Meanwhile, the properties such as carrying capacity, self-lubrication performance and service life of the designed and prepared iron-base alloy are obviously superior to that of the existing copper casting material.

Description

Technical field: [0001] The invention relates to a high-strength and high-self-lubricating iron-based alloy, a preparation method and an application thereof, and belongs to the technical fields of powder metallurgy technology, new materials, and engineering machinery parts manufacturing. technical background: [0002] Construction machinery components are used in harsh environments with heavy loads and large impacts. Some core components not only have high manufacturing precision, but also have high requirements for friction and wear, anti-occlusion performance, friction pair matching, and material strength. Therefore, the manufacturing cost is higher than General machinery industry. Construction machinery engineers have been seeking the application of new materials, new processes and new technologies in the field of construction machinery in order to obtain good economic and technical benefits. Oil cylinder shaft sleeve parts are one of the core components of construction ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/42C22C38/46C22C38/44C22C38/04C22C33/02F15B15/20
CPCC22C33/0278C22C38/005C22C38/04C22C38/42C22C38/44C22C38/46F15B15/20
Inventor 彭世超赵永立刘旭杨志易亮
Owner 湖南屹林材料技术有限公司