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Copper-base powder metallurgy brake pad for high-power wind turbine generator sets and preparation technique thereof

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

Active Publication Date: 2010-11-03
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] After each component is mixed evenly according to the proportion, add aviation kerosene and zinc stearate (aviation kerosene: zinc stearate = 1: 1) of the total mass of the mixture with 1 to 2% of the total mass of the mixture, and use a three-dimensional mixer to mix evenly; 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 temper...

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] After each component is mixed evenly according to the proportion, add aviation kerosene and zinc stearate (aviation kerosene: zinc stearate = 1: 1) of the total mass of the mixture with 1 to 2% of the total mass of the mixture, and use a three-dimensional mixer to mix evenly; 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 wa...

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 uniformly mixed according to the proportion, it is mixed with aviation kerosene and zinc stearate (aviation kerosene:zinc stearate=1:1) mixed with 1 to 2% of the total mass of the mixture, and mixed evenly with a three-dimensional mixer; 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...

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Abstract

The invention relates to a copper-base powder metallurgy brake pad which is composed of copper, graphite, sea sand, ferrochromium, tin and ferrosilicon. The preparation technique comprises the following steps: weighing the powder components according to the proportion, incorporating zinc stearate and aviation kerosene, and evenly mixing; pressing into a pressed compact; and putting the pressed compact on a steel backing of which the surface is plated with copper, covering a graphite plate on the surface of the pressed compact, pressure-sintering in a sintering furnace in a gradient-temperature gradient-pressure mode, cooling in a water-cooling hood to room temperature, and discharging to obtain the copper-base powder metallurgy brake pad blank. The invention has the advantages of reasonable component proportioning, convenient manufacture, favorable wearability and long service life; the service life and braking performance of the brake pad can meet the braking requirements for a high speed shaft in the wind turbine generator set of which the power is greater than 2.5 MW; and the brake pad can be industrially produced, and has wide 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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IPC IPC(8): C22C9/00B22F5/00
Inventor 姚萍屏
Owner CENT SOUTH UNIV
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