Method of producing composite material from titanium nickelide-based alloys

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing composite material from titanium nickelide-based alloys. The disclosed method involves process connection of a basic semi-finished product and porous components via self-propagating high-temperature synthesis, wherein titanium nickelide is additionally introduced into the structure of the composite material on selected areas of the semi-finished product. Titanium nickelide is a powder with the following grain-size distribution: 50-100 mcm - 60 wt %, 100-150 mcm - 40 wt %, and is introduced into said structure by sintering at 1260-1280°C for 1-5 minutes.

EFFECT: widening the pore size interval towards small values.

4 dwg, 1 ex

 

The invention relates to medical technology.

One of the areas of improvement and further development of technical means of modern surgery, using the properties of Nickel-titanium, is the complication of the structure of the material. Existing technology-based alloys, Nickel-titanium allows you to create a heterogeneous structure, highlighting thus the class of composite materials. Last when appropriate komponovanie expand the scope of medical devices. For example, bone prosthesis, in accordance with its physiology, must combine strength plot (like the diaphysis of the bone), the plot rolling a joint in the joint (similar Apophis bone) and the area of the fixed joint with the remaining fragment of the bone. Used in surgical implant dentistry condyle of the temporomandibular joint (figure 1) includes a support base 7 of the solid titanium nickelide and functionally differentiated end sections, one of which 2 simulates the head misakomoko bone of the lower jaw, the second for andsales integration with the persistent jaw fragment. In accordance with the anatomical and physiological conditions of the surface of the first section should be as smooth as possible (to the state of polishing) and yet to contain micropores, the second - to procesinnovatie with the bone tissue, should be a coarse-textured. In the first case, the necessary small porosity, the pore size of the order of 50-150 μm, the second is larger.

A similar task is the problem of scale exist in the production of porous titanium nickelide in the process of overhauling the bulk defects and finishing material to the required working conditions.

The above and other problems are solved by technological komponowania structurally heterogeneous fragments, or shortages of material in places defects. In the end, such decisions is obtained composite material - the object of this proposal.

Metallurgical technology medical alloys based on titanium nickelide sufficiently well developed for their different structural forms. Thus, for the production of permeable porous homogeneous materials used method of self-propagating high temperature synthesis (SHS). [Alloys with shape memory in medicine. / Bill WA, Kotenko V.V. and other Publishing house of Tomsk state University, Tomsk, 1986. P.50].

The method includes preparing a mixture by thoroughly mixing powders of titanium, Nickel and alloying elements such as iron, molybdenum, extrusion and formation of cylindrical headquarters and holding in a prepared volume of the fusion reaction. The specificity of the reaction is carried out using the of EPLA the reaction, which is released during the chemical reactions (exothermic reaction) of Nickel and titanium is enough for its self-maintenance. Traveling wave layer-by-layer combustion reserves the cooling product - porous Nickel-titanium alloy.

The method is technically simple and cheap. Its disadvantages include the increased heterogeneity of porosity in the bars of small diameter (less than 8 mm) and even inconsistency in the manufacture of layered forms of small thickness, as well as limited range of pore sizes from small values.

Against these disadvantages are more solid is porous, nickelide titanium obtained in other known method of powder metallurgy - way sintering [Medical materials and implants with shape memory. Publishing house of Tomsk state University, Tomsk, 1998. S]. It includes heated in vacuum and the shutter speed at a temperature of about 1190-1220°C briquettes, compressed from a mixture of powdered ingredients. For homogenizing the resulting porous structure of the sintering process are investigated.

Both of these methods are critical to the modes of carrying out reactions. Structure of the obtained porous alloys is influenced by the dispersion of the original powder ingredients, the homogeneity of the prepared mixtures, the degree of spressovannost, temperature and time parameters.

In the composition used in the in the framework of the above mentioned tasks of technological regimes tightened. The definition of the modes requires a scientific approach, the corresponding inventive creativity. Was found and became a well-known method of manufacturing a composite material based on titanium nickelide as the supporting basis with permeable porous coating selected portions of the base or entirely.

The method includes manufacturing and simultaneously applying a layer of a porous-permeable Nickel-titanium alloy of the underlying semi-finished product during the SHS reaction. To do this, the selected areas of the surface of the basic semi-finished product is fixed by using a heat-resistant form the desired layer of a mixture of powders of Nickel, titanium and essential alloying ingredients and initiate it samariterstrasse high-temperature synthesis reaction of the alloy.

The above disadvantage of the SAF, namely limited by low values of the interval of pore sizes is also broadcast on its composite variation. For the greatest resemblance to offer this method is chosen as a prototype.

The technical result of the invention is the interval extension of pore size on selected parts made of composite material by their low values.

This technical result is achieved in that in the method of manufacturing composite materials made of alloys based on Nickel is Ethan, including technological connection of basic semi-finished product and porous components by the method of self-propagating high temperature synthesis, structure material of choice impose additional porous components by the method of sintering a powder of Nickel-titanium at a temperature 1260-1280°C, maintained for 1-5 minutes

The novelty of the proposed solution is an additional step in the manufacture of the composite, more complex than the method-prototype, material, temperature and time regimes of this action. About "inventive step" indicates the scientific nature of the search and determine the mode of sintering in the specific conditions of heat exchange processes between the relatively small volumes namechaemykh components and basic semi-finished product. Rationale and physical interpretation of these modal intervals is as follows.

The formation of porous conglomerate during sintering of the individual granules of the powder occurs in solid mode due to the formation of diffusion bridges between adjacent granules and saved devoid of gaps. The ratio of educated bridges and gaps determines the mechanical strength and the parameters of a porous sintered material. When the sintering temperature below 1260°C formed bridges thin and therefore fragile, or not at all is prasouda. The resulting material is brittle (2; 4). At temperatures above 1280°C appears melt Nickel-titanium, which fills the gaps and leads to coalescence. The material loses its porosity (figure 2; 5). The optimal ratio between strength and porosity is achieved by exposure of the powder at specified intervals of temperature and time.

The predominant pore size of the coating is less than the least possible in the manufacture of coatings by the SHS method and complies with the conditions of the fine processing to obtain a ground and polished surface of a class in the presence of micropores.

Technical result achieved can significantly extend the functionality of the material and, accordingly, the scope of its application in practical surgery.

The method also allows the elimination of defects and surface repair products and preparations of porous titanium nickelide and bring them to working condition, thereby increasing the output of expensive material.

The illustrations presented:

figure 1. Artificial condyle of the temporomandibular joint: 1 - supporting basis, 2 - miscellany area, 3 - area of articulation with the bone;

figure 2. Samples of composite products with defects porous components: 4 - fragile structure, obtained at sintering temperature below 1260°C, 5 - low-porosity structure is obtained in which the temperature sintering above 1280°C;

figure 3. Heat-resistant form for applying porous layer by the method of baking;

figure 4. Procurement condyle to napicanija porous part.

Achievable technical result is confirmed by examples of specific implementations of the method for the production of materials and products made of titanium nickelide LLC"NPP" Medical engineering center, Tomsk.

Example.

In the manufacture of the prosthesis misakomoko area of the mandible (figure 1) used the proposed method is implemented as follows.

As the blanks to complete the required composition of the individual parts of the prosthesis are made form of the prosthesis (figure 4). It contains bearing basis (reference product) in the form of a wedge-shaped perforated plate machined from cast Nickel-titanium with a layer of porous titanium nickelide printed on its wide end by the SHS method. The workpiece is placed on a stable base, the narrow end cover detachable cylindrical quartz form (figure 3), which is filled with a dense filling of powder titanium nickelide with particle size: 50-100 μm - 60 wt.%, 100-150 μm to 40 wt.%. Formed Assembly is placed in a cold oven and heated to a temperature of 1270°C, which was incubated for 4 min Obtained composite view figure 1 process to the overall surface and air-condit is, dictated by the requirements of the anatomy. The plot of the prosthesis formed by the method of napicanija porous layer, is treated sequentially to the state of the polished surface class. Microscopic inspection of the surface detects the presence of the surface of micropores that are required for proper functioning of the prosthesis in the conditions of circulation of synovial fluid, providing food joint. The lack of such opportunities in the manufacture of the layer by the SHS method shows the advantage of the proposal, i.e. the reachability technical result.

"Industrial applicability" of the method is the availability of tools and information clear for General use.

A method of manufacturing a composite material made of alloys based on titanium nickelide, including technological connection of basic semi-finished product and porous components by the method of self-propagating high temperature synthesis, characterized in that it further into the structure of the composite material on selected areas of basic semi-finished product is injected porous components, a powder titanium nickelide with a particle size of 50-100 μm - 60 wt.%, 100-150 μm to 40 wt.%, method of sintering the powder at a temperature 1260-1280°C, maintained for 1-5 minutes



 

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FIELD: process engineering.

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2 tbl, 4 ex

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FIELD: medicine.

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2 cl, 2 dwg, 1 ex

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2 cl, 6 dwg, 2 tbl, 2 ex

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