Method of producing nano-structure commercially pure titanium for biomedicine

FIELD: metallurgy.

SUBSTANCE: proposed method comprises processing the workpiece in explosive accelerator by high-velocity Ti powder particle flow in the mode of super deep penetration of particles. Note here that Ti particles are arranged under explosive with air gap. Acceleration of articles is carried out by shock wave in accelerator guide channel coupled with processed workpiece. Processing is performed by flow of particles with dispersity of 20 mcm at flow rate of 1.5-2.5 km/s, density of 1 g/cm3, pressure of collision of particles with workpiece material of 12-15 GPa and their interaction time of 5-7·10-5 s.

EFFECT: higher strength and homogeneity of titanium workpiece structure.

1 dwg


The invention relates to the field of nanostructure of maripipi. by processing the stream of powder particles with the energy of the explosion, high physical-mechanical and chemical properties which allow to use for medicine purposes, including implants.

Analog is the invention of nanostructured commercially pure titanium for biomedical applications [RU No. 2383654 C1, C22F 1/18 VW 3/00 2008141956/02, 22.10.2008]. The invention is implemented by processing the rod of commercially pure titanium by the method of equal-channel angular pressing (pressing) at a temperature not exceeding 450°C for 4 passes to achieve the true accumulated strain e≤4 die in a snap with the angle of the intersecting channels equal to 90°. As a result of this process the received sub-grain structure with a grain size in the range 0.5...0.7 microns.

After pressing the workpiece is subjected to a thermomechanical treatment, during which the plastic deformation with the gradual reduction of temperature in the interval 450-350°C with the total accumulated strain from 40 to 80%, and the rate of deformation varies in the range of 10-2-10-4with-1.

Thus, the result of the combined treatment in the commercially pure titanium is formed of nanocrystalline structure in which up to 90% of grains with an average size of 100-500 is m and the aspect ratio of the grains is not more than 2 in mutually perpendicular planes. The tensile strength of the obtained titanium is σB=1330 MPa, an elongation of 12%, relative narrowing of 50%.

This method has some disadvantages concerning the methods of obtaining the material. 1. The complexity of obtaining material, as technology includes 4 passes pressing, then special thermomechanical processing, 2. Additional heating of the material. 3. Complex technological equipment.

The prototype is a method of hardening of metals by processing the stream of powder particles in the regime of super-deep penetration of particles independent of the state fire [S. M. usherenko Superdeep penetration of particles in the barriers and the creation of composite materials, Minsk: Institute of pulse processes. - 1998. - p.30-31]. This method is based on the use of explosive accelerator, which is a shaped charge explosives, in the hollow of which is placed the powder. Initiating explosive accelerator generates a flow of powder particles and guides him by focusing cumulative jet directed onto the sample metal or alloy.

Features of functioning of explosive accelerator:

1. Throwing particles is a shaped charge with a cumulative cladding, and the missile powder, is cumulative seizure.

2. The particle stream is formed by focusing the cumulative page is I.

3. Processing of the matrix produced by the particles of the non-matrix material elements.

The design of the explosive accelerator, in which the powder is inside the hemispherical cumulative extraction of explosive charge, does not provide the necessary uniformity of the jet particles. Regulation homogeneity of the jet is ensured by increasing the velocity gradient, quasistability process and material handling for multiple passes.

Implementation modes of processing materials (pressure of particle collisions 10-15 HPa, the dispersion of particles of 10-100 μm, a density of about 1 g/cm3the speed of the missile particles of 1-3 km/s) provides volumetric saturation of metals and alloys elements of powder particles at depths exceeding by more than 2 orders of magnitude the size of powder particles. Penetrating particles formed in the material of the channel size of about 1 μm and nanostructuring material. The minimum size of the remaining particles of ~50 nm. Hardening action gives amorphization of microplasma (size of 10 nm or more) near the walls of the channels penetrating particles, as well as highly deformed and fragmented area around the channels with well-developed dislocation structure. Material properties greatly vary depending on the type of powder particles. Thus, when processing the titanium diboride steel 10 tordos the ü source HV140 increases to HV 240. Strength increases to 930 MPa, which is 1.4 times higher than the original. Wear resistance of hardened tool steels under conditions of shock and vibration loads increased in 1.3-1.65 times.

The proposed method of producing nanostructured commercially pure titanium for biomedical applications provides the following technical result: increased strength and uniformity of the material structure.

The technical result is achieved by processing the workpiece in an explosive accelerator high-speed flow of powder particles Ti mode superdeep penetration of particles, and the particles Ti placed under the explosive substance with an air gap, the acceleration of particles perform a shock wave in the guide channel of the accelerator, mating with the machined workpiece, while the processing is done by the particle flux particle size of 10 μm with a flow rate of 1.5-2.5 km/s, density 1 g/cm3the pressure of particle collisions with the workpiece material 12-15 GPA of time and their interaction (5-7)·10-5C.

Diagram of the device materials processing shown in Fig.1. This device includes a detonator (1) to initiate an explosive charge (2) in the shell (3). Under the explosive charge through an air gap (4) placed the capsule with the powder material (5). The formation of the stream and its orientation is sudestada in the guide channel (6), its base is joined with the treated sample source material (7).

The main differences of the operation of the proposed facility from the prototype:

1. The acceleration of particles is carried out by initiating a cylindrical charge without cumulative facing. The air gap provided in the structure directly behind the lower cut charge, contributes to the formation of the rectangular front of the shock wave. Missile powder is in accordance with the generated shock wave front is parallel to the lower edge of the charge. In order to obtain commercially pure titanium for biomedical cumulative lining of the prototype is not suitable, as it contributes to hardening of the material of the cladding. The explosive used for charging in the proposed method, to treat a group full of gas.

2. The formation of the high-speed flow of powder particles is implemented in orienting the channel.

3. Processing a matrix of titanium W 1-0 titanium powder particles.

4. Differences in 1, 2 and 3 item from the prototype provides a more uniform processing of the workpiece.

This scheme allows us to provide the necessary processing modes titanium. When the speed of the particles of 1.5-2.5 km/s and the particle flux density of Ti of about 1 g/cm3the pressure of particle collisions is OK the lo 12-15 GPA. The time of interaction of the particles with the material (5-7) 10-5spri collision of particles with VT1-0 the temperature reaches 250°C.

To obtain nanostructured commercially pure titanium was used the original samples VT1-0 with a diameter of 20 mm and height 15 mm, the Dispersion of the shot particles of titanium is 10 microns.

The resulting nanostructured fine structure of titanium grade VT1-0, the grain size of about a micrometer. Processing of materials in a mode independent of the state fire assumes that the material along with the grinding of grain, reinforced micro-channels penetrating particles, the walls of which amortizatory and are welded, which further nanostructural material and has a strengthening effect [Krivchenko A.L., Aleksentseva S.E. Peculiarities of the Dynamic Interaction Between the Directed Stream of High Speed Particles and Metals. // Shock Waves in Condensed Matter: Proc. of Int. Conf. - St. Petersburg, Russia, October 8-13, 2000, p.175-176.].

Channels penetrating particle diameter is less than 1 μm. On the walls of the channels are traces of the penetrating particles, and in the zone of inhibition recorded the remains of the penetrated particles down to 0.05 μm. The saturation concentration of a material in the channels defined in the processing of high-speed particles of titanium W 1-0 with pickle slice matrix and reaches 27.5%. The density of channels can reach 300 mm-2.

The proposed method, due to differences in the design is presented to the device from explosive accelerator prototype, provides more uniform interaction of the flow of particles from the original sample material, ensures high durability material. So, strength is increased 1.5 times. Plasticity varies slightly, elongation of 15%. The dislocation density reaches about ~1011cm-2. Microhardness N increased from the original 1900 MPa to 2600 MPa after processing the stream of powder particles.

The nanostructuring of the matrix by processing high-speed flow of powder particles of titanium may provide for any technical grades of titanium: W 1-0, W 1-00 to the pure iodide titanium, as well as the number of brands used in medicine Grade 1 - Grade 4. The purpose of hardening was used brand titanium, relatively low strength characteristics, as W 1-0.

We offer machining of commercially pure titanium flow of particles Ti (pair Ti → Ti) provides the obtaining of nanostructured commercially pure titanium and the possibility of applying for the purposes of Biomedicine. Commercially pure titanium is one of the most suitable material for the manufacture of implants, which is well merges with the living tissues and is currently used for long-term presence in the human body. The application of such implants hung the t on the strength and durability of the material. Therefore, the enhancement of the mechanical properties of titanium without the introduction of additional alloying elements such as vanadium, chromium alloys Ti5Al12.5Sn, Ti5Al13V11Cr [D.M. Brunette, P. Tengvall, M. Textor, P. Thomsen, "Titanium in medicine". Springer (2001), p.1019], which reduce the biocompatibility and contribute to the accumulation of toxic elements, is the goal of the proposed method.

The method of obtaining nanostructured commercially pure titanium for biomedical applications, including the processing of the workpiece in an explosive accelerator high-speed flow of powder particles Ti mode superdeep penetration of particles, and the particles Ti placed under the explosive substance with an air gap, the acceleration of particles perform a shock wave in the guide channel of the accelerator, mating with the machined workpiece, while the processing is done by the particle flux particle size of 10 μm with a flow rate of 1.5 to 2.5 km/s, density 1 g/cm3when the pressure of particle collisions with the workpiece material 12-15 GPA and time of their interaction 5-7·10-5C.


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