Wide temperature zone self-lubricating nickel-chromium alloy base composite material and preparation method thereof

A technology of nickel-chromium alloy and composite material, which is applied in the field of wide-temperature self-lubricating nickel-chromium alloy-based composite material and its preparation, can solve the problems of poor wear resistance at room temperature and the like, and achieves reduction of friction coefficient and wear rate, improvement of wear resistance, The effect of excellent mechanical properties

Inactive Publication Date: 2007-11-28
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The prepared self-lubricating alloy has excellent tribological properties and can be used at room t

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0015] Example 1: The composition and mass percentage of the self-lubricating nickel-chromium alloy-based composite material in the wide temperature zone of the present invention are: Ni: 36.8%, Cr: 11.12%, Mo: 15%, Al: 6.0%, Ti: 8.0%, B : 0.08%, MoS 2 : 15%, LaF 3 :8%. Among them, in addition to the solid solution strengthening effect of Mo, its oxide has a good high temperature lubrication effect; Al and Ti form the intermediate phase to play a dispersion strengthening effect and improve the mechanical properties; rare earth fluorides and oxides have high temperature lubrication effect; adding MoS 2 The purpose is to introduce sulfur into the alloy, and the sulfide generated by hot pressing will have a lubricating effect at medium and low temperatures. MoS 2 The addition amount should be controlled within a certain range because MoS 2 The addition amount is too low, the sulfide generated after hot pressing is less, and the lubricating effect is not obvious; MoS 2 If the content ...

Example Embodiment

[0018] Example 2: The components and mass percentages of the self-lubricating nickel-chromium alloy-based composite material in the wide temperature zone of the present invention are: Ni: 52.72%, Cr: 9.2%, Mo: 9%, Al: 2.0%, Ti: 8.0%, B : 0.08%, MoS 2 : 15%, LaF 3 : 4%. Mix the powders of the above components and their mass percentages uniformly on a ball mill. The milling time is 20min and the rotation speed is 150r / min. After the powders are fully mixed, they are first cold pressed into a Φ45mm×15mm disc shape in a steel mold, and then the disc shape The samples are put into the graphite mold at a time, and the two samples are separated by graphite sheets, and are formed by hot pressing with a Japanese FVPHP-R-10 Fuji vacuum hot press. Vacuum first to 2×10 -5Pa, filled with nitrogen for protection, and then heated to 1240~1280°C. After reaching the temperature, a positive pressure of 12MPa is applied, and the temperature is kept for 20 minutes. The Archimedes method is used to me...

Example Embodiment

[0020] Example 3: The composition and mass percentage of the self-lubricating nickel-chromium alloy-based composite material in the wide temperature zone of the present invention are: Ni: 57.6%, Cr: 14.4%, Mo: 14.92%, Al: 2.0%, Ti: 3.0%, B : 0.08%, MoS 2 : 6%, LaF 3 :2%. Mix the metal powders of the above components and their mass percentages uniformly on a ball mill. The milling time is 20min and the speed is 150r / min. After the powders are fully mixed, they are first cold pressed into a Φ45mm×15mm disc shape in a steel mold, and then the disc shape The samples were put into the graphite mold at a time, and each two samples were separated by graphite sheets, and they were formed by hot pressing with a Japanese FVPHP-R-10 Fuji vacuum hot press. Vacuum first to 8×10 -5 Pa, filled with nitrogen for protection, and then heated to 1240~1280°C. After reaching the temperature, a positive pressure of 16MPa was applied, and the temperature was kept for 20 minutes. The Archimedes method is...

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Abstract

A kind of self-lubricating nickel chromium alloy group compound material with wide temperature band and the preparation method of it. The components and the mass percent of them are: Ni: 36.8-57.6%, Cr: 9.2-14.4%, Mo: 9.0-15.0%, Al: 2.0- 6.0%, Ti: 3.0-8.0%, B: 0.08%, MoS2: 6.0-15.0%, rare-earth compound: 2.0-8.0%. The preparation method contain the following steps: The powders of the above components according to the above mass percent will be uniformly mixed in ball crusher or mortar. The powders uniformly mixed will be chill pressed to mould and then will be put into the graphite mould to be hot pressed to mould in a vacuum thermocompressor. The process is as following: firstly, to be vacuumized to 2X10-5-8X10-5Pa, and to inflate N2 to protect them, and then the temperature will be increased to 1200-1280deg.C, a positive pressure 12-16MPa will be added when the temperature has got, to preservate the temperature and the press for 20-30min. From normal temperature to 700deg.C, the patent own lots of advantages, such as the mechanical strength of it is high, the oxidation resistance is high. The tribology ability of it is well, and it can be used to resolve the running problem of all kinds of hot engine and other high temperature machine and the lubricating problem of packing parts in wide temperature band range.

Description

technical field [0001] The invention belongs to the technology of self-lubricating composite materials, in particular to a wide-temperate-band self-lubricating nickel-chromium alloy-based composite material and a preparation method thereof, which solves the problem that ordinary grease cannot lubricate in a wide temperature range. Background technique [0002] The speed and power output of lightweight, efficient heat engines and advanced propulsion systems are vastly higher than before, where frictional components must operate at higher temperatures. High temperature oxidation, high friction and severe wear will lead to the rapid failure of tribological components. Aiming at the above problems, domestic and foreign scholars have conducted a lot of research on this and achieved many research results. [0003] For example: CN1034584A, an invention patent published in 1989, uses nickel-niobium alloy as the substrate, and adds appropriate amount of molybdenum, iron, active eleme...

Claims

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Application Information

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IPC IPC(8): C22C19/05C22C30/00C22C1/05B22F3/14
Inventor 熊党生李建亮
Owner NANJING UNIV OF SCI & TECH
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