A kind of copper-based silicon dioxide composite material and preparation method thereof

A technology of silica and composite materials, which is applied in the field of metal materials and their preparation, can solve the problems of rare research and difficulty in uniform dispersion, achieve good wear resistance, hinder dislocation movement and grain boundary slip, reduce Effect of friction factor and wear rate

Active Publication Date: 2021-01-05
GRIMAT ENG INST CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since n-SiO 2 It is very easy to agglomerate, and it is not easy to disperse uniformly in the copper matrix, resulting in the prepared SiO 2 Enhanced properties of copper matrix composites and Cu / Al 2 o 3 Compared with composite materials, there is no advantage, so n-SiO 2 There are not many studies on copper matrix as a reinforcing phase

Method used

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  • A kind of copper-based silicon dioxide composite material and preparation method thereof
  • A kind of copper-based silicon dioxide composite material and preparation method thereof
  • A kind of copper-based silicon dioxide composite material and preparation method thereof

Examples

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preparation example Construction

[0026] The preparation method of the copper-based silicon dioxide composite material of the present invention comprises the following steps: batching - high-energy ball milling - mixing - cold pressing forming - pressurized sintering - finished product. Its specific process steps include:

[0027] (1) High-energy ball milling: the weighed electrolytic copper powder (average particle size ≤ 74μm, purity ≥ 99.9wt%), nano-sized SiO 2 (the average particle size is 20-40nm) placed in a planetary high-energy ball mill and pre-milled for 2-4 hours.

[0028] (2) Mixing of raw materials: copper-nano-SiO after ball milling 2 Mixed powder, atomized tin powder (average particle size 40-50μm, purity ≥98wt%), flaky natural graphite (average particle size 140-160μm, purity ≥99wt%), micron-sized SiO 2 (average particle size is 40-50 μm, moisture content≤1wt%) placed in a small V-shaped mixer and mixed for 3-5 hours; the quality of the raw materials used in the examples is the same as above....

Embodiment 1

[0032] Its production process method is as follows: batching - ball milling - mixing - cold pressing forming - pressure sintering - finished product

[0033] The specific process is: according to the ingredient distribution shown in Table 1, copper and nano-SiO 2 The mixed powder was milled in a high-energy ball mill for 3 hours, and then mixed with other raw materials in a small V-shaped mixer for 3 hours; Press the powder into a steel mold with a density of 4-5g / cm 3The compact is sintered in a bell furnace under a pressure of 1.0MPa, the sintering temperature is 980°C, the average heating rate is 6°C / min, a reducing protective atmosphere is used in the sintering process, the sintering time is 40min, and finally The furnace is cooled to room temperature under a protective atmosphere to make a finished product. The properties of the prepared finished products are shown in Table 2.

Embodiment 2

[0035] Its production process method is as follows: batching - ball milling - mixing - cold pressing forming - pressure sintering - finished product

[0036] The specific process is: according to the ingredient distribution shown in Table 1, copper and nano-SiO 2 The mixed powder was milled in a high-energy ball mill for 2 hours, and then mixed with other raw materials in a small V-shaped mixer for 5 hours; Press the powder into a steel mold with a density of 4-5g / cm 3 The compact is sintered in a bell furnace under a pressure of 2.5MPa, the sintering temperature is 900°C, and the average heating rate is 5°C / min. During the sintering process, a hydrogen reducing protective atmosphere is used, and the sintering time is 35min. Finally, the furnace is cooled to room temperature under a protective atmosphere to make a finished product. The properties of the prepared finished products are shown in Table 2.

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Abstract

The invention relates to a copper-based silicon dioxide composite material and a preparation method thereof and belongs to the technical field of metal materials and preparation thereof. The compositematerial is prepared from the following components in percent by mass: 0.5-10% of tin, 10-25% of graphite, 2-8% of silicon dioxide, 0-2% of nano silicon dioxide and the balance copper. The preparation method comprises the following steps: proportioning; ball milling; mixing; cold pressure forming; pressurized sintering; and obtaining a product. The tensile strength of the copper-based composite material prepared by the preparation method is higher than 300 MPa, the yield strength is equivalent to that of a copper-based aluminum oxide composite material, the wear rate is smaller than 1*10<-9>cm<3> / J, the heat-resistant coefficient is higher than 35000, and the heat resistance and the wear resistance are better than those of the copper-based aluminum oxide composite material. A wear-resistant part prepared by the material can meet the demand of a product or equipment working normally for a long time in a relatively high temperature condition.

Description

technical field [0001] The invention relates to a copper-based silicon dioxide composite material and a preparation method thereof, in particular to an alloy used in a high-temperature and high-friction environment and a preparation method thereof, belonging to the technical field of metal materials and its preparation. Background technique [0002] Due to its good wear resistance and thermal conductivity, copper-based composite materials are used as brakes and braking devices for aircraft, automobiles, ships, and construction machinery, and are widely used in high-tech fields such as electromechanical, aerospace, and microelectronics. There has been a long history of research on copper-based composite materials used at high temperatures at home and abroad, and a series of industrial products such as copper-based composite oxides, carbides, borides and nitrides have been formed. [0003] With the development of high-speed and heavy-duty equipment, higher requirements are pla...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C9/00C22C32/00C22C1/05C22C1/10
Inventor 刘冬梅王强松刘芳
Owner GRIMAT ENG INST CO LTD
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