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A preparation process of copper-based powder metallurgy brake pads for high-power wind turbines

A technology for wind turbines and brake pads, applied in the field of powder metallurgy, can solve the problems of large damage to the brake disc, insufficient braking force, and short service life, and achieve the effects of ensuring no cracking, stable friction coefficient and long service life.

Active Publication Date: 2011-12-07
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are technical defects such as insufficient braking force, poor reliability, short service life and large damage to the brake disc

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The components of the brake material are (percentage by weight): copper 70, graphite 11, sea sand 2, tin 3, ferrochrome 11, ferrosilicon 3.

[0029] The manufacturing process is as follows:

[0030] Each component is mixed evenly according to the proportion, and then mixed with aviation kerosene and zinc stearate (aviation kerosene:zinc stearate=1:1) with a total mass of 1~2% of the mixture, and mixed evenly with a three-dimensional mixer; Press into a powder compact with a pressure of 600MPa; use No. 45 steel plate with a thickness of 2.5mm to process it into a steel back, copper-plated, and the thickness of the coating is 10-20μm; the pressing and sintering process of the compact is as follows: Furnace pressure is 1.0MPa, furnace temperature is 700°C to 850°C, controlled furnace pressure is: 2MPa; furnace atmosphere: hydrogen protective atmosphere; heating system: heat up to 600°C at a rate of 5°C / min, and then, at 2°C Raise the temperature to 850°C at a speed of 2 h...

Embodiment 2

[0033] The components of the brake material are (percentage by weight): copper 75, graphite 10, sea sand 3, tin 1, ferrochrome 10, ferrosilicon 1.

[0034] The manufacturing process is as follows:

[0035] Each component is mixed evenly according to the proportion, and then mixed with aviation kerosene and zinc stearate (aviation kerosene:zinc stearate=1:1) with a total mass of 1~2% of the mixture, and mixed evenly with a three-dimensional mixer; The powder compact is formed with a pressing pressure of 500MPa; No. 45 steel plate with a thickness of 2.5mm is used to process it into a steel back, copper-plated, and the thickness of the coating is 10-20μm; the pressurized sintering process of the compact is as follows: The furnace pressure is 1.5MPa, the furnace temperature is 700°C to 850°C, the furnace pressure is controlled as: 2.5MPa; the atmosphere in the furnace is hydrogen protective atmosphere; Heat up to 900°C at a rate of °C / min, keep warm for 3 hours, add a water-cool...

Embodiment 3

[0038] The components of the brake material are (weight percent): 65 copper, 15 graphite, 1 sea sand, 2 tin, 15 ferrochrome, and 2 ferrosilicon.

[0039] The manufacturing process is as follows:

[0040] After each component is mixed evenly according to the proportion, add aviation kerosene and zinc stearate (aviation kerosene:zinc stearate=1:1) with 1 to 2% of the total mass of the mixture, and use a three-dimensional mixer to mix evenly; The mixture is formed into a powder compact with a pressing pressure of 350MPa; No. 45 steel plate with a thickness of 2.5mm is used to process it into a steel back, copper-plated, and the thickness of the coating is 10-20μm; the pressing and sintering process of the compact is as follows: , the control furnace pressure is 2MPa, the furnace temperature is 700°C to 850°C, the control furnace pressure is: 3MPa; the atmosphere in the furnace: hydrogen protective atmosphere; The speed of ℃ / min is raised to 950 ℃, and after 3 hours of heat prese...

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Abstract

A copper-based powder metallurgy brake pad for high-power wind turbines, which is composed of the following components: copper, graphite, sea sand, ferrochrome, tin, and ferrosilicon; its preparation process includes the following steps: first, by group Distribution ratio Weigh the powder of each component, mix it with zinc stearate and aviation kerosene, and mix evenly; then, press it into a compact; place the compact on a steel back with electroplated copper on the surface, and cover the surface of the compact with a graphite plate cover, put it into a sintering furnace for gradient temperature gradient pressure pressurization sintering, add a water-cooled cover to cool to normal temperature, and take it out of the furnace to obtain the copper-based powder metallurgy brake pad blank of the present invention. The invention has reasonable component distribution ratio, convenient processing and manufacturing, good wear resistance, and long service life; its service life and braking performance can meet the braking requirements of high-speed shafts of wind turbines with a power greater than 2.5MW, and can realize industrialized production with good industrialization prospects. .

Description

Technical field: [0001] The invention relates to a powder metallurgy brake pad and its preparation process, in particular to a copper-based powder metallurgy brake pad for a high-power wind turbine and its preparation process; specifically, it is a brake pad applied to a high-power wind turbine The high-performance and long-life copper-based powder metallurgy brake pad and its preparation process belong to the technical field of powder metallurgy. Background technique: [0002] Wind energy, known as "white coal in the blue sky", is one of the world's attention-grabbing renewable energy sources. The development and use of high-power domestic wind turbines (above 2.5MW) is listed as a major project of the "Eleventh Five-Year" National Science and Technology Support Plan, and is an important step in the realization of my country's leapfrog development plan that wind power will account for 10% of the country's total electricity by 2050. Assure. The friction pair for high-speed ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F5/00
Inventor 姚萍屏
Owner CENT SOUTH UNIV
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