RU2558949C2 - Carbon fibre reinforcement frame, workpiece for making reinforcement frame and method of making same - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: carbon fibre reinforcement frame for producing carbon-carbon composite material, which is resistant to oxidation and erosion under high temperature and pressure, for example, for the tip of a rocket head, comprises a central unidirectional cylindrical bundle of a given diameter made of carbon fibre bonded with binder - aqueous polyvinyl alcohol solution, on which, like an arbour, a cocoon of carbon fibre is wound by honeycomb winding. The workpiece for making a reinforcement frame of carbon fibre is in the form of a unidirectional cylindrical bundle of a given diameter arranged centrally along an axis and made of carbon fibre which is bonded with aqueous polyvinyl alcohol, on which, at a distance equal to the height of a workpiece of the tip of a rocket head by ring winding, polar barriers are applied in the form of a spherical surface made of carbon fibre soaked with the binder - aqueous polyvinyl alcohol solution. The method of making a reinforcement frame from carbon fibre for producing carbon-carbon composite material, which is resistant to oxidation and erosion under high temperature and pressure, is carried out in the following sequence: winding a cocoon of carbon fibre soaked with aqueous polyvinyl alcohol on a workpiece, having a bundle of unidirectional carbon fibre with two polar barriers by honeycomb winding, as on an arbour. After drying the frame and cutting off the ends of the cocoon with polar barriers, the frame is taken for saturation with a carbon matrix.

EFFECT: making a high-density reinforcement frame which, after saturation with a carbon matrix, is used to produce carbon-carbon heat-protective material, which is resistant to erosion under the effect of high temperatures and pressure, for example, the tip of a rocket head.

4 cl, 4 dwg

Description

The invention relates to the field of heat-resistant materials resistant to erosion when exposed to high temperatures and pressures, and more particularly to the design of a carbon fiber reinforcing frame and a method for its manufacture.

Known heat-protective carbon-carbon composite materials operating under high temperatures and pressures are a composition consisting of a reinforcing core frame assembled from rods made of carbon fiber and a carbon matrix.

A known design of the core frame for composite materials [1], reinforced in five directions with preferred strength along one of the axes of the reinforcement. The patented structure consists of a main bundle and four interconnecting bundles.

Also known is a three-dimensional structure for reinforcing [2], including the first, second, third and fourth sets, each of which consists of many elongated rectilinear and parallel elements located parallel in the corresponding direction and arranged in the form of many rows.

    A known design for assembling a reinforcing core frame described in US patent US 4168337 [2] and containing two vertically mounted relative to the horizontal plane of the lattice located at a predetermined distance from each other and made in the form of a frame equipped with holes for inputting rods forming the frame .

Despite the advantages of the technical solutions patented above, they do not allow to obtain a heat-protective material of increased density and, therefore, more resistant to erosion damage when exposed to high temperatures and pressures. And the device for assembling the reinforcing core frame described in US patent US 4168337 [2] cannot be used for the manufacture of the patented reinforcing frame.

There is also known a method of producing a carbon-carbon composite resistant to oxidation [3], including the manufacture of a frame of carbon fiber material and its heating and soaking in a stream of gaseous hydrocarbons, the frame being made by a set of carbon fiber rods in a cylindrical beam, after which the frame reinforced with carbon fiber, and heating is carried out by direct transmission of electric current through a reinforced frame to a temperature of 900-950 ° C, while gaseous hydrocarbons are used rirodny gas.

The present invention is the development of a reinforcing frame of high density to obtain a more erosion-resistant carbon-carbon material, the design of the workpiece for the manufacture of such a frame and a method for its manufacture.

The problem is solved in that the carbon fiber reinforcing frame for the manufacture of a carbon-carbon composite material resistant to oxidation and erosion when exposed to high temperatures and pressures, for example, for the tip of the rocket head contains a centrally located unidirectional cylindrical carbon fiber bundle, bonded with a binder - an aqueous solution of polyvinyl alcohol, onto which, like a mandrel, a cocoon of carbon fiber impregnated by cross winding was wound aqueous solution of polyvinyl alcohol.

A blank for the manufacture of such a carbon fiber reinforcing frame for manufacturing a carbon-carbon composite material is made in the form of a unidirectional cylindrical carbon fiber bundle centrally located along the axis, bonded with a binder - an aqueous solution of polyvinyl alcohol, at a distance equal to the height of the blank of the tip of the head part, the method of ring winding applied pole barriers in the form of a spherical surface of carbon fiber impregnated with a binder - in polyvinyl alcohol solution.

For the manufacture of two or more blanks of the tips of the head part, two pole barriers are applied to the cylindrical bundle at a distance corresponding to two or more heights of the blanks of the tips of the head part.

The manufacture of a patented reinforcing frame is as follows.

A cocoon made of carbon fiber impregnated with an aqueous solution of polyvinyl alcohol is cross-wound onto a workpiece containing a bundle of unidirectional carbon fiber bonded with a binder - an aqueous solution of polyvinyl alcohol, with two pole barriers, as a mandrel, and then the frame is dried and then trimmed endings of the cocoon with pole barriers, the frame is sent to saturation with a carbon matrix. The patented method makes it possible to manufacture a reinforcing framework of increased density, which, after its saturation with a carbon matrix, is used as a heat-shielding material resistant to erosion damage when exposed to high temperatures and pressures.

The invention is illustrated graphic materials, where:

- FIG. 1 shows a General view of the reinforcing frame, where L is the length of the cocoon, and 1 is the height of the workpiece tip of the head part;

- FIG. 2 shows the design of the workpiece for winding the cocoon of the frame, where 1 is the height of the workpiece tip of the head part;

- FIG. 3 shows the initial stage of winding the cocoon onto the workpiece;

- FIG. 4 shows a General view of the reinforcing frame for the simultaneous manufacture of two blanks of the tips of the combat units.

The reinforcing frame 1 (Fig. 1) includes a centrally located unidirectional cylindrical bundle 2 made of carbon fiber 3, fastened with a binder - an aqueous solution of polyvinyl alcohol, on which, like a mandrel, a cocoon of carbon fiber impregnated with an aqueous solution of polyvinyl alcohol is wound.

The reinforcing frame is made as follows. First, a preform is made (Fig. 2), containing a cylindrical bundle 2 of carbon fiber 3, bonded with a binder - an aqueous solution of polyvinyl alcohol, onto which pole barriers 4 are applied by ring winding, made in the form of a spherical surface of carbon fiber impregnated with a binder - aqueous solution polyvinyl alcohol. The distance between the pole barriers 4 is chosen equal to the height (1) of the workpiece 5 of the tip of the head part. The beam diameter 2 d is chosen equal to 0.3 of the radius of blunting of the tip.

On the blank 6 thus obtained (Fig. 2), as on a mandrel, the cocoon 7 is made from carbon fiber impregnated with an aqueous solution of polyvinyl alcohol by cross winding. The initial winding step is shown in FIG. 3. The winding of the cocoon (Fig. 1) is carried out up to a diameter D ₁ equal to the diameter D (maximum diameter of the workpiece for the manufacture of the tip of the head part) plus technological allowance.

After drying, the technological allowance of the cocoon to diameter D is removed, a part of the cocoon 7 (located above the pole barriers) and pole barriers 4 are cut off. The reinforcing cage thus obtained is sent to be saturated with a carbon matrix.

For the manufacture of two or more reinforcing frames at the same time (Fig. 4), two pole barriers are applied to the cylindrical bundle 2 at a distance equal to two or more heights of the blanks of the tips of the head part, after which the cocoon is wound.

Information sources

     1. Patent US 4268560, CL IPC V32V 5/12. A three-dimensional structure having a predominant direction of reinforcement. Published 05/19/1981

2. Patent US 4168337, CL IPC V32V 5/12. Three-dimensional structure for reinforcement. Published September 18, 1979

3. Patent RU 2090497, cl. IPC С01В 31/02. The method of obtaining a carbon-carbon composite, resistant to oxidation. Priority 02/20/1995

Claims (4)

1. The reinforcing frame of carbon fiber for the manufacture of carbon-carbon composite material resistant to oxidation and erosion when exposed to high temperatures and pressures, for example, for the tip of the head of the rocket, characterized in that it contains a centrally located unidirectional cylindrical bundle of carbon fiber, bonded with a binder - an aqueous solution of polyvinyl alcohol, onto which, like a mandrel, a cocoon of carbon fiber impregnated with water was wound by cross winding m solution of polyvinyl alcohol. 2. A workpiece for the manufacture of a carbon fiber reinforcing frame for the manufacture of a carbon-carbon composite material, characterized in that it is made in the form of a unidirectional cylindrical carbon fiber bundle centrally located along the axis, bonded with a binder - an aqueous solution of polyvinyl alcohol, at a distance equal to the height of the workpiece of the tip of the head part, pole barriers are applied by the method of ring winding in the form of a spherical surface of carbon fiber, p replenished with a binder - an aqueous solution of polyvinyl alcohol. 3. A workpiece for the manufacture of a reinforcing carcass according to claim 2, characterized in that two pole barriers are applied to the cylindrical bundle at a distance corresponding to two or more heights of the blanks of the tips of the head part. 4. A method of manufacturing a carbon fiber reinforcing carcass to obtain a carbon-carbon composite material resistant to oxidation and erosion when exposed to high temperatures and pressures, for example, the tip of the rocket’s head, characterized in that the blank containing a beam of unidirectional carbon fiber, bonded with a binder - an aqueous solution of polyvinyl alcohol, with two pole barriers, as on a mandrel, the carbon fiber cocoon is wound by cross winding, p dosed with an aqueous solution of polyvinyl alcohol, and after drying the frame and subsequent trimming the tips of the cocoon with pole barriers, the frame is sent to the carbon matrix for saturation.

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