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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 temperature to 600 °C, but it still has the disadvantage of poor wear resistance at room temperature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1: The components of the wide temperature zone self-lubricating nickel-chromium alloy-based composite material of the present invention and their mass percentages 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 role of solid solution strengthening, Mo's oxides have good high-temperature lubrication; Al and Ti form interphases to play a role of dispersion strengthening and improve mechanical properties; rare earth fluorides and oxides play a role in high-temperature lubrication; adding MoS 2 The purpose is to introduce sulfur into the alloy, and the sulfide generated by hot pressing acts as a lubricant at medium and low temperatures. MoS 2 The amount added should be controlled within a certain range, because MoS 2 The addition amount is too low, the sulfides formed after hot pressing are less, and the lubricating effect is not obvious; MoS 2 If the content is too high, the mechanical ...

Embodiment 2

[0018] Example 2: The components and mass percentages of the wide temperature zone self-lubricating nickel-chromium alloy matrix composite material 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 above components and their mass percentage powders evenly on a ball mill, the ball milling time is 20min, and the rotation speed is 150r / min. The samples were loaded into the graphite mold at one time, separated by graphite sheets between each two samples, and hot-pressed with a Japanese-made FVPHP-R-10 Fuji vacuum hot press. Vacuum first to 2×10 -5Pa, filled with nitrogen for protection, then heated up to 1240-1280°C, after reaching the temperature, apply a positive pressure of 12MPa, and keep the pressure for 20min. The density of the composite material was measured by the Archimedes method, the bending strength was measured by the three-point bending method, and the pin-on-disk friction and wear test wa...

Embodiment 3

[0020] Example 3: The components and mass percentages of the wide temperature zone self-lubricating nickel-chromium alloy matrix composite material 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 above components and their mass percentage metal powders on a ball mill evenly, the ball milling time is 20min, and the speed is 150r / min. The sample is loaded into the graphite mold at one time, separated by graphite sheets between each two samples, and hot-pressed with a Japanese-made FVPHP-R-10 Fuji vacuum hot press. Vacuum first to 8×10 -5 Pa, filled with nitrogen for protection, and then heated up to 1240-1280°C, after reaching the temperature, apply a positive pressure of 16MPa, and keep the pressure for 20min. The density of the composite material was measured by the Archimedes method, the bending strength was measured by the three-point bending method, and the pin-on-disk friction and wear test w...

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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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