Device for gas-thermal oxidation of objects made from titanium and titanium-containing alloys

IPC classes for russian patent Device for gas-thermal oxidation of objects made from titanium and titanium-containing alloys (RU 2369663):

F27B17 - Furnaces of a kind not covered by any of groups F27B0001000000-F27B0015000000; (structural combinations of furnaces F27B0019020000)

C23C8/10 - Oxidising

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FIELD: physics.

SUBSTANCE: invention relates to equipment for passivation of metal surfaces, more specifically to devices for gas-thermal oxidation of objects made from titanium and titanium-containing alloys. The device has an oxidation chamber, fitted with a cooling system and a heating system, a unit for feeding gaseous mixture into the oxidation chamber, a unit for outlet of gaseous mixture from the chamber, a chamber for cooling oxidised objects, which has a unit for flowing cooling inert gas medium in and out. The cooling chamber is joined to the oxidation chamber through a rotary valve, made with two hemispherical gates, which can open and close the opening in the rotary valve for joining or separating both chambers.

EFFECT: device which allows for obtaining oxide coating on objects, with high corrosion resistance without formation of brittle titanium nitride compounds.

3 cl, 4 dwg

The invention relates to equipment for passivation of metal surfaces, namely, devices for thermal oxidation of titanium products and titanium-containing alloys.

The known device thermal oxidation provide passivation of the surface of many metals and alloys [1-3], but in respect of articles of titanium and titanium-containing alloys, widely used in implant medicine, these devices are not applicable, due to the inability to provide the technical conditions for the formation of oxide coatings without education in them soft and low corrosion resistant titanocene phases and other metal oxide compounds that reduce the efficiency of the use of titanium and titanium-containing alloys in dentistry, traumatology and orthopedics.

A device for paratergites oxidation of metals and alloys (SU 498363), consisting of a steam chamber, liquid evaporative environment, heater liquid and vapor-gas medium. The disadvantage of this device is the difficulty and complexity of the design. This device allows you to asseverate articles of titanium and titanium-containing alloys by the formation of protective oxide coatings with low corrosion resistance and mechanical strength.

The closest analogue, mnene the authors, is a device for oxidation of metals and alloys by the RF patent No. 2189400 camera including oxidation (steam chamber), the circulation system of steam-air mixture, the capacity of the liquid, the condenser of the steam and condensate collector, the heating chamber oxidation, the node for the supply of the gas mixture in the chamber. This device allows you to oksidirovanii some ferrous and non-ferrous metals and alloys using several gaseous mixtures. Articles of titanium and titanium-containing alloys treated in this device passivated with the formation of the oxide layer fragile titanocene and low corrosion-resistant metal oxide compounds.

Object of the invention is a device for thermal oxidation of titanium and titanium-containing alloys in gas mixtures, allowing us to obtain the products of the oxide coating with high corrosion resistance and not having the weakest titanocene connections.

The problem is solved as follows. In the device for thermal oxidation of titanium products and titanium-containing alloys, containing the camera oxidation with heating system, the node feed gas mixture into the chamber oxidation and a node for removal from the chamber the gas mixture, Luggage oxidation is equipped with a cooling system, when et is m, the device further comprises a cooling chamber oxidized products, having nodes for the flow of feed into it cooling inert gas environment and its drain and connected to the camera oxidation through rotary valve made of two hemispherical locking elements made with the possibility to open and close the through hole in shluzova gate for connection or separation of the volumes of the two chambers, cooling chambers oxidation is executed in the form of the circulation paths of the cooling liquid medium, placed at equal distances from the heating system in the form of a heating element placed on the camera body oxidation and closed on the outer side of the casing, in addition the device has two lids covering the device with two opposite sides one cover is installed from the side of the camera oxidation, in which is mounted a hub for the supply of the gas mixture and the second cover is installed from the side of the cooling chamber and provided with a latch.

The presence of a cooling chamber with a flow of incoming inert gas prevents the formation on surfaces of articles of titanium and titanium-containing alloys low corrosion-resistant metal oxide phases and the weakest titanocene compounds arising from the cooling of the parts in the air.

A rotary shutter device allows you to connect and share the volumes of the chambers on the seeding and cooling due to two hemispherical locking elements, creating the necessary conditions for oxidation and cooling products.

The presence of the design of the camera oxidation of the cooling system in the form of the circulation paths of the cooling liquid medium provides accelerated decrease the chamber temperature to the required level for loading and oxidation of another batch of products.

The presence of the lid from the side of the camera oxidation creates the opportunity to implement the required technical training internal area for a given flow of processing products with high quality oxide coating.

The invention is illustrated by drawings, where figure 1 shows the external appearance of the device, figure 2 shows the design of the component parts of the device, figure 3 is a rotary shutter in position "open", 4 - rotary valve in position "closed".

The proposed device consists of a cylindrical two-chamber design and consists of a camera oxidation of 1 and a cooling chamber 2 (see figure 1). Cameras 1 and 2 are interconnected by means of the rotary valve 3. The device is closed with two opposite sides of the camera oxidation of 1 and a cooling chamber 2 caps 4 and 5, respectively. Luggage oxidation 1 is equipped with a heating system as set on the camera body 1, the heater e is ementa 6 (see 2)connected to tokoizoliruyuschy electrical connection 7 power source (not shown). On the outer side of the heating element 6 is closed by a cover 8 with spacers of insulating material. In the cover 4 is mounted a gas-feeding nozzle 9, and the suction nozzle 10 is mounted in the camera housing oxidation of 1, which is equipped with a thermocouple 11 placed inside the chamber 1 and the cooling system in the form of cooling circuits 12 with fittings, providing circulation of liquid medium. Cooling circuits 12 are located on the camera body 1 with the two sides of the heating element 6 at an equal distance from it. In case cooling chamber 2 is mounted fittings 13 and 14 for the feed and withdrawal, respectively, of a cooling inert gas environment. Cap 4 and 5 are equipped with sealing rings (not shown), in addition cover 5 provided with a latch 15. A rotary shutter 3 is made with two locking hemispherical elements, having the ability to open and close the through hole in shluzova the shutter, thereby connecting the volumes of the two chambers or separating them.

The device operates as follows. When the cover is open 5 and the rotary valve 3 in the open position through the cooling chamber 2 loads of processed products in the camera 1. Citing a rotary shutter 3 is in position "Zack is YTO", closing the lid 5 with the latch 15 includes a heating element 6 to provide a predetermined temperature in the chamber 1, using thermocouple 11. Through a gas-feeding nozzle 9 is applied to the camera 1, the working gas mixture and carrying out the process of thermal oxidation products. After completion of the process of oxidation of the heating element 6 is disconnected from a power source, a rotary shutter 3 is installed in the "open"position, open the cover 5 and the processed products from the camera 1 is moved to the cooling chamber 2. The cover 5 is closed, a rotary shutter 3 is installed in the "closed"position. Into the chamber 2 through the fittings 13 and 14 serves flowing protective gas, which is cooled products. Simultaneously carry out the cooling chamber 1 oxidation to room temperature, producing a circulation of cooling liquid through the circuits 12. After cooling the oxidized products by opening the cover 5, are removed from the camera 2.

Literary sources of information

1. Gladkova E.N. Theoretical foundations and technology paratergites oxidation. Saratov: Publishing house of Sarat. University, 1973, 103 S.

2. Voitovich Russia, having got, Golovko AI high Temperature oxidation of titanium and its alloys. Kiev: Nauk. Dumka, 1984, 256 S.

3. Voitovich Russia, having got, Golovko AI, however, L.V. Features vysokotemperaturno the th oxidation of titanium. - Journal. physical chemistry, 1975, 49, No. 5, S-1167.

1. Device for thermal oxidation of titanium products and titanium-containing alloys, containing the camera oxidation with heating system, the node feed gas mixture into the chamber oxidation and a node for removal from the chamber the gas mixture, characterized in that the camera oxidation is equipped with a cooling system, where the device further comprises a cooling chamber oxidized products, with nodes for the flow of feed into it cooling inert gas environment and its drain and connected to the camera oxidation through rotary valve made of two hemispherical locking elements made with the possibility to open and close the through hole in shluzova gate for connection or separation of volumes both cameras.

2. The device according to claim 1, characterized in that the cooling system of the camera oxidation is executed in the form of the circulation paths of the cooling liquid medium, placed at equal distances from the heating system in the form of a heating element placed on the camera body oxidation and closed on the outer side of the casing.

3. The device according to claim 2, characterized in that it has two lids covering the device with two opposite sides, one cover is installed from the side of the camera xidirov the Oia, in which is mounted a hub for the supply of the gas mixture and the second cover is installed from the side of the cooling chamber and provided with a latch.