Iron-based oil-containing bearing material of controllable pore structure and preparation method of iron-based oil-containing bearing material

Abstract

The invention relates to an iron-based oil-containing bearing material of a controllable pore structure and a preparation method of the iron-based oil-containing bearing material. Hair and titanium hydride powder are mixed as a composite pore forming agent to be placed in an iron matrix blank. According to the bearing material, in the friction and wear process, oil in pores flows to the surface toform a lubricating oil film, friction is reduced, meanwhile, micro grooves in the surface of a friction pair can be filled with C60 nanoparticles in the oil so as to reduce roughness, and the effectof reducing friction is achieved. The ball grinding process is adopted, the composite pore forming agent and iron powder are mechanically alloyed, the shape of the pore forming agent is regular, the shape of the pore forming agent has geometric heritability to the pore forms, and therefore generated pores are regular in size and are evenly distributed in an iron matrix. The blank is placed in inert gas to be sintered, titanium hydride is subjected to dehydrogenation at high temperature in the sintering process, open pores are formed in the iron matrix, the hair is decomposed at high temperature, a large number of micron-order bridge pore channels are formed to penetrate through the open pores formed by titanium hydride, and connectivity of the pores is improved.

Description

technical field [0001] The invention belongs to the technical field of bearing materials, and in particular relates to an iron-based oil-containing bearing material with a controllable pore structure and a preparation method thereof. Background technique [0002] With the development of modern spaceflight and aviation industry, the tribology of space machinery has developed rapidly. The iron-based self-lubricating iron-based material with low friction coefficient has inherent advantages due to its simplified mechanical structure design, and has become a friction material. It is a hotspot in the field of scientific research and has been successfully applied to miniature iron-based bearings used in outer space. The pore volume in the bearing is about 10% -40%. This pore volume can be used to store fluid lubricant and supply oil under self-propelled state to improve the lubrication condition. [0003] In the preparation of iron-based oil-impregnated bearings, pore-forming agen...

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Problems solved by technology

[0003] In the preparation of iron-based oil-impregnated bearings, pore-forming agents such as ammonium bicarbonate, urea, and stearic acid are added to the raw material powder in advance in the industry, but these pore-forming agents are easy to decompose or gasify at relatively low temperatures. It is difficult to control the production management. The formed pores are easy to close during the long sintering process in the later stage, forming closed pores that are not connected to the outside world, resulting in the effective porosity not reaching the standard and the oil storage capacity of the material is reduced.

At the same time, when the urea decomposition product HCNO, which is corrosive to the iron base, is discharged through the iron base, it will affect the iron base, thereby affecting the performance and application of the material.

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