Method for manufacturing high-strength carbon/carbon hot-press die

A technology of hot-pressing molds and manufacturing methods, which is applied in the field of hot-pressing molds, can solve problems such as low axial mechanical properties, lack of densification process, and poor integrity, and achieve the goals of increasing furnace loading, reducing thickness, and improving production efficiency Effect

Inactive Publication Date: 2011-05-18
XIAN CHAOMA SCI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method has the advantages of simple process and low cost, but its disadvantages are (1) lack of densification process and low density, less than 1.5g / cm 3 ; (2) only hoop winding, low axial mechanical properties, poor integrity

Method used

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  • Method for manufacturing high-strength carbon/carbon hot-press die
  • Method for manufacturing high-strength carbon/carbon hot-press die

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Step 1, the carbon fiber of 3K is impregnated with the speed of 0.5m / s by filling the glue tank of epoxy resin glue; The epoxy resin glue is epoxy resin and epoxy resin reactive diluent 660 (butyl butyl glycidyl ether) mixed resin glue, the epoxy resin reactive diluent diluent 660 (butyl glycidyl ether) in the epoxy resin glue is 10% by mass, and the balance is epoxy resin;

[0027] Step 2. Continuously wrap the impregnated carbon fiber in the graphite mandrel 1 in a hoop direction, wrap 3 layers in the hoop and then wrap 3 layers in the longitudinal direction, and repeat the winding until the desired diameter is reached. The direction of the longitudinal winding is The included angle with the graphite mandrel 1 axis is 10°;

[0028] Step 3. Put the preform in a resistance carbonization furnace, cure at 60°C for 60 hours, and then raise the temperature to 900°C at a heating rate of 15°C / h for carbonization;

[0029] Step 4, impregnating the carbonized preform in phenol...

Embodiment 2

[0033] Step 1, the carbon fiber of 12K is impregnated with the speed of 0.5m / s by filling the glue tank of epoxy resin glue; The epoxy resin glue is epoxy resin and epoxy resin reactive diluent 660 (butyl butyl glycidyl ether) mixed resin glue, the epoxy resin reactive diluent diluent 660 (butyl glycidyl ether) in the epoxy resin glue by mass percent is 20%, and the balance is epoxy resin;

[0034] Step 2. Continuously wrap the impregnated carbon fiber in the graphite mandrel 1 in a hoop direction, wrap 5 layers in the hoop, then wrap 1 layer longitudinally, and repeat the winding until the desired diameter is reached. The direction of the longitudinal winding The included angle with the axis of the graphite mandrel 1 is 20°;

[0035] Step 3: Put the preform in a resistance carbonization furnace, cure at 80°C for 60 hours, and then raise the temperature to 900°C at a heating rate of 20°C / h for carbonization;

[0036] Step 4, immerse the carbonized preform in pitch for 8 hours...

Embodiment 3

[0040] Step 1, the carbon fiber of 8K is impregnated with the speed of 0.5m / s by filling in the glue tank of epoxy resin glue solution; Described epoxy resin glue solution is epoxy resin and epoxy resin active thinner 660 (but butyl glycidyl ether) mixed resin glue, the mass percent of epoxy resin reactive diluent diluent 660 (butyl glycidyl ether) in the epoxy resin glue is 15%, and the balance is epoxy resin;

[0041] Step 2: Continuously wrap the impregnated carbon fiber in the graphite mandrel 1 in a hoop direction, wrap 4 layers in the hoop, then wrap 2 layers in the longitudinal direction, and repeat the winding until the desired diameter is reached. The direction of the longitudinal winding is The included angle with the axis of the graphite mandrel 1 is 30°;

[0042] Step 3: Put the preform in a resistance carbonization furnace, cure at 70°C for 60 hours, and then raise the temperature to 900°C at a heating rate of 18°C / h for carbonization;

[0043] Step 4, immerse th...

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Abstract

The invention discloses a method for manufacturing a high-strength carbon / carbon hot-press die, comprising the steps of: winding dipped carbon fibers on a graphite core die alternatively in a circumferential winding manner and a longitudinal winding manner to obtain a preformed body with required diameter, curing the preformed body, and then carbonizing; dipping the carbonized preformed body, and then carrying out carbonization and vacuum high-temperature treatment; and machining the preformed body subjected to vacuum high-temperature treatment to obtain the high-strength carbon / carbon hot-press die. Compared with a simply circumferential winding structural mode, small-angle longitudinal wound fibers are added in the method, and the fibers in the direction are favorable for both circumferential acting force and longitudinal acting force, overcomes the defect of the circumferential winging structure and improves the integral performance of the product. Compared with the graphite die, the high-strength carbon / carbon hot-press die provided by the invention has the thickness reduced by almost two thirds, and has the advantages of greatly improving charging amount and production efficiency and reducing cost under the condition with a definite furnace chamber dimension.

Description

technical field [0001] The invention belongs to the technical field of hot-pressing dies, and in particular relates to a method for manufacturing a high-strength carbon / charcoal hot-pressing die. Background technique [0002] The hot pressing process is a material forming method that combines molding and sintering. One-way or three-way pressure is applied to powder compacts or loose powders installed in graphite or other rigid molds, and the powders are plastically deformed at high temperatures. Or creep powder metallurgy densification method, which is often used to prepare ceramic materials such as silicon nitride, boron carbide, etc., as well as metal and alloy materials that are difficult to sinter, such as Ti-Al-based alloys. [0003] At present, the commonly used hot pressing mold is graphite material. The tensile strength of graphite material is about 20MPa, so the design thickness is relatively thick, which occupies a large space in the hot-press furnace, affects the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/83
Inventor 肖志超李永军苏君明侯卫权彭志刚陈青华谢英姿赵大明
Owner XIAN CHAOMA SCI TECH
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