Carbon-carbon compositional material

FIELD: medicine.

SUBSTANCE: invention relates to medicine, in particular to orthopedics, and can be applied in production of endoprosthesis of human joints and other products, as well as in different fields of technology. Carbon-carbon compositional material (CCCM) with filler in form of carbon tissue layers has pyrocarbon matrix, which additionally contains boron. Components in its matrix are in the following ratio, wt % boron - (1-19); pyrocarbon - the remaining part. In addition, into CCCM filler layers of titanium mesh can be additionally introduced between carbon tissue layers.

EFFECT: by means of invention increase of physical and mechanical properties of carbon-carbon composition materials is achieved.

2 cl, 2 tbl, 3 ex

 

The present invention relates to medicine, in particular to orthopedics, and can be used in the manufacture of implants of human joints and other products, as well as in various areas of technology.

The use of carbon-carbon composites (CCC), with unique thermal, mechanical, erosion and radiation properties, biocompatibility with human tissues, opens broad prospects for further development of aerospace and engineering machinery, metallurgy, reactor engineering, and medicine. These properties, in particular, help to improve the quality of products used in orthopedic practice in the treatment of bone fractures in dentistry.

To industrial carbon composite materials are materials on the basis of volume of reinforcing structures of carbon polyacrylonitrile, hydrocellulose and pitch fibers associated pyrocarbon, coke and hybrid matrix [1].

In the CCC, where the reinforcing structure and the matrix is made of carbon, a reinforcing filler used in the form of discrete fibers, continuous filaments or bundles, felts, fabrics, three-dimensional structures (powders). The nature and properties of the carbon matrix and filler, largely determine the properties of the CCC. The matrix combines the reinforcing element is (fiber or powder) in the composite material, allow the material in the best way to perceive various external loads. The matrix takes part in the creation of the bearing capacity of the composite, providing transmission on the filler.

From the matrix depend on the preservation of material properties during long-term storage, thermal properties, resistance to high temperatures and corrosive environments, electrical properties, erosion resistance, coefficient of friction of the material and its radiation resistance.

The most common matrices used pyrocarbon, coal coke and petroleum pitches and glass carbon [1].

Known carbon-carbon composite material with pyrocarbon matrix and filler in the form of layers of carbon fabric used in medicine [2]. This material is chosen as a prototype, get through the linking carbon fiber fabric carbon in the environment of methane (CH4) when heated to temperatures above 1000°C. At this temperature, methane is decomposed into carbon and hydrogen. Hydrogen gas leaks and carbon, deposited, connects the carbon fiber. Physico-mechanical properties of the CCC are shown in table 1.

The aim of the invention is the improvement of physico-mechanical properties of carbon-carbon composite materials used in medicine and engineering, and t is the train improve their rentgencontrastnoe.

This goal is achieved by the fact that the carbon-carbon composite (CCC) with a filler in the form of layers of carbon fabric has a pyrocarbon matrix, which further comprises boron. The components in the matrix are in the following ratio, wt.%: Bor 1-19; pyrocarbon - rest. In addition, to further improve the physico-mechanical properties and give the material rentgencontrastnoe in filling the CCC between layers of carbon fabric may optionally be entered layers of mesh of titanium.

Known technical solutions with a combination of symptoms that are similar to the features distinguishing the claimed solution to the prototype, not identified. These differences offer the CCC provide a number of important advantages in comparison with the prototype.

Introduction to matrix addition of boron can improve the physico-mechanical properties of the matrix is not less than 1.5 times. This is due to the fact that in the matrix along with pyrocarbon formed carbides of boron, which increases the strength of the matrix.

For example, the well-known isotropic property:

- carbon nanocomposite [3] (hereinafter UNIVERSITY) - pyrocarbon material obtained through co-pyrolysis of hydrocarbons with a halide of the refractory metal;

- pyrographic isotropic [4] (hereinafter PIP) - proper who meets the material produced by pyrolysis of hydrocarbons.

UNIVERSITY and PIP are homogeneous, isotropic, fine crystalline structure and is equal to the density. They differ only in the presence in the structure of the University of boron in the form of carbides of boron - (10-20)% which leads to the improvement of physico-mechanical properties of more than 1.5 times. Physico-mechanical properties of the UNIVERSITY and the PIP are shown in table 2.

UNIVERSITY due to its unique properties (high density, strength, wear resistance, biological compatibility with blood and body tissues) has found application in medicine. It is used for making the basic elements of artificial heart valves. To date, manufactured, delivered and successfully operate hundreds of thousands of artificial heart valves.

Physical-mechanical properties and test results on the toxicology and thromboresistant all materials containing boron in the range of 10-20 wt.% and isotropic pyrocarbon - rest, satisfy the requirements of material for implants. Therefore, the selected ratio of the components in the matrix provides the use of carbon composite materials for medicine.

For further improvement of physico-mechanical properties of the CCC and make the material of rentgencontrastnoe in the filler prompted layers of titanium mesh. The melting point of Titus is and 1677°C, and the temperature of obtaining the CCC about 1000°C, so titanium mesh will almost retain their properties in the structure of the CCC, making it more durable and radiopaque.

Implement the invention as follows.

To obtain the CCC of industrial graphite (grade HMP, GE or other brand with similar properties) are made of mandrel-heaters in the form of tubes with dimensions corresponding to the dimensions of the internal space of the vacuum setup (outer diameter and length of the mandrel-heater correspond to the internal diameter and length of the desired workpiece).

As source material for filler use carbon fabric (for example, grades of "Ural", "TGN-2M" or with other similar properties). They are issued by the industry in the form of tapes of a width of 500 mm and a length of 10-40 m feedstock viscose. The density of the carbon fibers in these tissues varies in the range of 1.16-1.5 g/cm3.

To prevent dust rolls of carbon cloth pre-soaked in water, and then wound on the mandrel-heater until the desired layer thickness. In the process of winding the excess fabric across the width of the tape are cut. The winding density is controlled by the tension of the fabric and is 0.5 g/cm3(carbon fiber).

Mandrel-heaters with namtan the th carbon cloth is dried in an oven at 120-140°C for 6-8 hours.

Gas-phase thermal-gradient seal formed thereby billets produced in the vacuum installation. In the installation download simultaneously from one to four blanks, which are put on each other and clamped between the upper and lower current leads.

The vapor seal is produced as follows. In the flow of natural gas and vapors of boron trichloride (BCl3) direct transmission of the current Assembly is heated to a temperature on the outer surface of the graphite mandrel-heaters 1000°C. Then the temperature continuously increases and after reaching on the outer surface of the workpiece 1050°C, the process is stopped. The components in the matrix the CCC depending on the particular ratio of supplied gases will be in the following ratio, wt.%: Bor 1-19; pyrocarbon - rest.

After completion of the compaction process and cooling Assembly inside the unit to room temperature, remove it from the camera pyrolysis and separated into its component parts. Compacted workpiece through the press is removed from mandrel-heaters, which are then re-used for subsequent saturation of such blanks.

Removed from mandrel-heaters carbon-carbon procurement process on a lathe to obtain a geometric shape corresponding to the set.

For the school, with greater improvement of physico-mechanical properties of the CCC and make the material of rentgencontrastnoe in the filler between the layers of carbon fabric stack layers mesh of titanium. Next, the process of obtaining the CCC is similar to that described above.

Example 1.

The matrix of the CCC: Bor 2 wt.% and pyrocarbon 98 wt.%. The material with the same matrix composition has the following physical and mechanical properties:

Density, kg/m31520
Bending strength, MPa160

Example 2.

The matrix of the CCC: Bor 19 wt.% and pyrocarbon 81 wt.%. The material with the same matrix composition has the following physical and mechanical properties:

Density, kg/m31600
Bending strength, MPa220

Example 3.

The matrix of the CCC with the addition of mesh layers of titanium: Bor 1 wt.%, titanium 20 wt.% and pyrocarbon 79 wt.%. The material with the same matrix composition has the following physical and mechanical properties:

Density, kg/m31700
Bending strength, MPa240

Physico-mechanical properties of the CCC with reinforced matrix shown in table 1.

ISOE is isawanya offer the CCC for the manufacture of implants and other products for medicine will improve their physical and mechanical properties and, as a consequence, to improve the quality of patient care. In addition, increasing roentgenocontrast will conduct quality control operations total products from the CCC.

Table 1
Physico-mechanical properties of carbon-carbon composite materials
PropertiesThe CCC(prototype)The CCC according to the invention
Density, kg/m31400-15001500-1700
The alloying element of the matrixnoIn
Compressive strength, MPa150-400200-500
Flexural strength, MPa100-160150-240
The tensile strength, MPa50-12080-200

Table 2
Physico-mechanical properties of isotropic peroperative
PropertiesPyrographic isotropicCarbon nanocomposite
Density, kg/m3Of 1,800-2,100Of 1,800-2,100
Alloying elementnoIn
Microhardness kg/mm240-7070-140
The modulus of elasticity, GPA13-1520-25
Flexural strength, MPa100-150250-450

Sources of information

1. Bushuev YG, person M.I. and Sokolov V.A. carbon-Carbon composite materials: a Handbook. - M.: metallurgy, 1994-127 C.

2. (Prototype) the Use of carbon-carbon composites in medicinehttp://www.carbon.com.ua.

3. Patent RU No. 2163105 C1, A 61 F 2/24, 20.02.2001.

4. Belik W. research in the field of technology of production of pyrographite. Inv. No. giph 1440, 1968.

1. Carbon-carbon composite material with a filler in the form of layers of carbon fabric and Pirog rodnoy matrix, characterized in that the pyrocarbon matrix additionally contains boron in the following ratio, wt.%:

Bor1-19
PyrocarbonRest

2. Carbon-carbon composite material according to claim 1, characterized in that the filler between the layers of carbon fabric is additionally introduced layers of mesh of titanium.



 

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