Preparation method of carbon-ceramic brake disc

A technology of brake discs and carbon ceramics, applied in mechanical equipment, friction linings, etc., can solve the problems of high material hardness, increased cost of brake discs, tool loss, etc., and achieve the goal of simplifying the processing process, shortening the processing cycle, and reducing production costs Effect

Active Publication Date: 2019-11-22

山东道普安制动材料有限公司

14 Cites 5 Cited by

AI-Extracted Technical Summary

Problems solved by technology

However, the high hardness of carbon-ceramic brake materials leads to time-consuming processing, serious tool loss, and extremely high processing...

Method used

By the brake disc prepared by the method of this embodiment, the cross-sectional SEM microscope view is shown in Figure 3 and Figure 4, as can be seen from Figure 3, the fan-shaped unit module (left) and the ring-shaped unit module (right) pass through the bonding agent During the infiltration process of the reaction melt, an adhesive layer is formed. The adhesive layer is uniform and dense, without pores and macroscopic cracks. The adhesive layer is composed of SiC and Si phases. It can be seen from the partially enlarged Figure 4 that the adhesive layer reacts with the unit module. A SiC transition layer was generated, avoiding the generation of ma...

Abstract

The invention relates to a preparation method of a carbon-ceramic brake disc. The preparation method comprises the following specific steps: preparing a carbon fiber preform; carrying out chemical vapor deposition on the preform to prepare a C/C composite material; processing the C/C composite material into unit modules; bonding to prepare a C/C brake disc; and preparing the carbon-ceramic brake disc through reactive melt permeation. By means of the method, the material utilization rate can be increased, waste and loss of materials for machining the carbon/ceramic brake disc are avoided, the machining time is shortened, and therefore the production cost of the carbon/ceramic brake disc is greatly reduced.

Application Domain

Friction lining

Technology Topic

Materials processingFiber +6

Image

Examples

Experimental program(10)
Comparison scheme(1)

Example Embodiment

[0035] Example 1

[0036] A preparation method of a carbon-ceramic brake disc includes the following steps:

[0037] (1) Preparation of carbon fiber preform

[0038] Use Toray T700-12K carbon fiber bundle to prepare unidirectional non-woven fabric and short fiber mesh, and then press 0° non-woven fabric, short fiber mesh, and 90° non-woven fabric to circulate layering to 1cm, then needling, then Repeat the above steps to prepare a carbon fiber preform with a size of 40cm*40cm*3cm, and ensure the density of the carbon fiber preform is 0.45g/cm 3 , 14-16 layers/cm.

[0039] (2) Preparation of C/C composites by chemical vapor deposition

[0040] Put the carbon fiber preform into a CVI furnace for isothermal and pressure chemical vapor deposition, the deposition temperature is 1100℃, the deposition gas is natural gas and ethylene, the natural gas flow is 80SLM, the ethylene gas is 40SLM, the deposition time is 340h, and the density is 1.40g/cm 3 C/C composite materials.

[0041] (3) Process C/C composite materials into unit modules, which include 6 sector-shaped unit modules and 2 circular unit modules;

[0042] (4) Unit modules are bonded to prepare C/C brake discs;

[0043] Put 30 parts of phenolic resin, 40 parts of absolute ethanol, and 30 parts of C powder into a ball mill tank, and perform ball milling and mixing for more than 2 hours to ensure that the adhesive is evenly mixed;

[0044] After applying 0.5-1.0mm adhesive on the upper and lower surfaces of the fan-shaped unit module, the fan-shaped unit module and the ring-shaped unit module are bonded and assembled to prepare a C/C brake disc, and then placed in an oven for curing. The curing temperature It is 250℃, and the holding time is 2h;

[0045] (5) Preparation of carbon/ceramic brake discs by reaction melt penetration

[0046] Put the silicon powder in the BN crucible and put the above-mentioned bonded C/C brake disc on the silicon powder. The amount of silicon powder used is twice the weight of the C/C brake disc, and then put it in the siliconizing furnace, and vacuum to 500pa Below, the temperature is increased to 1500°C for melt infiltration, and the holding time is 30 minutes.

Example Embodiment

[0047] Example 2

[0048] A method for preparing a carbon-ceramic brake disc includes the following steps:

[0049] (1) Preparation of carbon fiber preform

[0050] Use Toray T700-12K carbon fiber bundle to prepare unidirectional non-woven fabric and short fiber mesh, and then press 0° non-woven fabric, short fiber mesh, and 90° non-woven fabric to circulate layering to 1cm, then needling, then Repeat the above steps to prepare a carbon fiber preform with a size of 40cm*40cm*3cm, and ensure the density of the carbon fiber preform is 0.45g/cm 3 , 14-16 layers/cm.

[0051] (2) Preparation of C/C composite material by chemical vapor deposition

[0052] Put the carbon fiber preform into a CVI furnace for chemical vapor deposition. The deposition temperature is 1100℃. The deposition gas is natural gas and ethylene. The flow rate of natural gas is 80SLM, the ethylene gas is 40SLM, and the deposition time is 340h. The density is 1.40g/ cm 3 C/C composite materials.

[0053] (3) Process the C/C composite material into 8 fan-shaped unit modules and 2 circular unit modules

[0054] (4) Unit modules are bonded to prepare C/C brake discs;

[0055] Put 40 parts of phenolic resin, 40 parts of absolute ethanol, and 20 parts of SiC into the ball milling tank, and perform ball milling and mixing for more than 2 hours to ensure that the adhesive is evenly mixed;

[0056] After applying 0.5-1.0mm adhesive on the upper and lower surfaces of the fan-shaped unit module, the fan-shaped unit module and the ring-shaped unit module are bonded and assembled to prepare a C/C brake disc, and then put into an oven for curing. The curing temperature It is 250℃, and the holding time is 2h;

[0057] (5) Preparation of carbon/ceramic brake discs by reaction melt penetration

[0058] Put the silicon powder in the BN crucible and put the above-mentioned bonded C/C brake disc on the silicon powder. The amount of silicon powder used is twice the weight of the C/C brake disc, and then put it into the silicon infiltration furnace and vacuum to 500pa Below, the temperature is increased to 1500°C for melt infiltration, and the holding time is 30 minutes;

Example Embodiment

[0059] Example 3

[0060] A method for preparing a carbon-ceramic brake disc includes the following steps:

[0061] (1) Preparation of carbon fiber preform

[0062] Toray T700-12K carbon fiber bundle is used to prepare unidirectional non-woven fabric and short fiber mesh, and then press 0° non-woven fabric, short fiber mesh, and 90° non-woven fabric to circulate layering to 1cm, then needling, then Repeat the above steps to prepare a carbon fiber preform with a size of 40cm*40cm*3cm, and ensure the density of the carbon fiber preform is 0.45g/cm 3 , 14-16 layers/cm.

[0063] (2) Preparation of C/C composite material by chemical vapor deposition

[0064] Put the carbon fiber preform into a CVI furnace for chemical vapor deposition. The deposition temperature is 1100℃. The deposition gas is natural gas and ethylene. The natural gas flow rate is 80SLM, ethylene gas is 40SLM, and the deposition time is 340h. The density is 1.4g/ cm 3 C/C composite materials.

[0065] (3) Process the C/C composite material into 6 fan-shaped unit modules and 2 circular unit modules

[0066] (4) Unit modules are bonded to prepare C/C brake discs;

[0067] Put 40 parts of phenolic resin, 40 parts of absolute ethanol, and 20 parts of SiC into the ball milling tank, and perform ball milling and mixing for more than 2 hours to ensure that the adhesive is evenly mixed;

[0068] After applying 0.5-1.0mm adhesive on the upper and lower surfaces of the fan-shaped unit module, the fan-shaped unit module and the ring-shaped unit module are bonded and assembled to prepare a C/C brake disc, and then put into an oven for curing. The curing temperature It is 250℃, and the holding time is 2h;

[0069] (5) Preparation of carbon/ceramic brake discs by reaction melt penetration

[0070] Put the silicon powder in the BN crucible and put the above-mentioned bonded C/C brake disc on the silicon powder. The amount of silicon powder used is twice the weight of the C/C brake disc, and then put it into the silicon infiltration furnace and vacuum to 500pa Below, the temperature is raised to 1500°C for melt infiltration, and the holding time is 30 minutes.

[0071] The brake disc prepared by the method of this embodiment, the cross-sectional SEM microscope view is as image 3 , Figure 4 Shown by image 3 It can be seen that the fan-shaped unit module (left) and the ring-shaped unit module (right) form an adhesive layer during the infiltration process of the reaction melt through the adhesive. The adhesive layer is uniform and dense without pores and macro cracks. The adhesive layer Composed of SiC and Si phases, enlarged by local Figure 4 It can be seen that the bonding layer reacts with the unit module to form a SiC transition layer, avoiding the occurrence of macro cracks, indicating that the bonding layer has excellent mechanical properties.

PUM

Property	Measurement	Unit
Density	0.45	g/cm³

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

increase profit
Simplify the machining process

Preparation method of carbon-ceramic brake disc

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

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Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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