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High temperature solid carburizing process of medical titanium alloy

A high-temperature solid, titanium alloy technology, applied in the high-temperature solid carburizing process of medical titanium alloys, to achieve the effects of improving hydrogen embrittlement problem, simple operation, and improving stability and reliability

Active Publication Date: 2016-08-17
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a more effective, simple and energy-saving high-temperature solid carburizing process for medical titanium alloys to improve the wear resistance and service life of medical titanium alloys in view of the hydrogen embrittlement problem that is easily generated in the current carburizing technology

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  • High temperature solid carburizing process of medical titanium alloy
  • High temperature solid carburizing process of medical titanium alloy
  • High temperature solid carburizing process of medical titanium alloy

Examples

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Embodiment 1

[0024] Example 1: First, the medical titanium alloy TC4 is processed into a cylindrical shape with a diameter of 20mm and a thickness of 5mm, and polished to a rough surface reading Ra=0.020. The sample is placed in an acetone solution, ultrasonically cleaned for 30 minutes, and the cleaning is repeated 3 times . The sample was then placed in a drying oven at 100°C for 24 hours. The medical titanium alloy sample is buried in a solid carburizing agent. The mass percentage composition of the carburizing agent powder is: barium carbonate 15%, calcium carbonate 10%, charcoal 75%, and the particle size is 1-3mm; Heat it to 980℃ in a pit heating furnace and keep it for 6 hours, then stop heating, the sample is cooled with the furnace, and the titanium alloy sample is taken out when the furnace temperature reaches 25℃. The surface of the sample is polished to a surface roughness of Ra=0.020, that is, a titanium alloy carburized sample with cermet formed on the surface is obtained. Th...

Embodiment 2

[0025] Example 2: First, the medical titanium alloy TC4 is processed into a cylindrical shape with a diameter of 20mm and a thickness of 5mm, and polished to a rough surface reading Ra=0.020. The sample is placed in an acetone solution, ultrasonically cleaned for 30 minutes, and the cleaning is repeated 3 times . The sample was then placed in a drying oven at 100°C for 24 hours. The medical titanium alloy sample is buried in the solid carburizing agent. The mass percentage of the carburizing agent powder is: sodium carbonate 15%, barium carbonate 10%, calcium carbonate 5%, charcoal 70%, and the particle size is 1~ 3mm; and put them in a well-type heating furnace to heat to 1180℃ and keep for 2h, then stop heating, the sample is cooled with the furnace, and the titanium alloy sample is taken out when the furnace temperature reaches 25℃. The surface of the sample is polished to a surface roughness of Ra=0.020, that is, a titanium alloy carburized sample with cermet formed on the...

Embodiment 3

[0026] Example 3: First, the medical titanium alloy TC4 is processed into a cylindrical shape with a diameter of 20mm and a thickness of 5mm, and polished to a rough surface reading Ra=0.020. The sample is placed in an acetone solution, ultrasonically cleaned for 30 minutes, and the cleaning is repeated 3 times . The sample was then placed in a drying oven at 100°C for 24 hours. The medical titanium alloy sample is buried in the solid carburizing agent. The mass percentage composition of the carburizing agent powder is: sodium carbonate 15%, barium carbonate 10%, calcium carbonate 5%, charcoal 70%, and the particle size is 1- 3mm; and put them in a well-type heating furnace to heat to 1280℃ and keep for 4h, then stop heating, the sample is cooled with the furnace, and the titanium alloy sample is taken out when the furnace temperature reaches 25℃. The surface of the sample is polished to a surface roughness of Ra=0.020, that is, a titanium alloy carburized sample with cermet f...

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Abstract

The invention relates to a medical titanium alloy high temperature solid carburizing technology, which belongs to the metal material surface carburizing technology. The technology comprises the following steps: 1)processing a medical titanium alloy to a cylinder shape, polishing to surface roughness Ra of 0.020, placing a sample in an acetone solution, employing ultrasonic cleaning for 30 minutes, repeatedly cleaning for three times, placing the sample in a drying box at 100 DEG C for drying for 24 hours; 2)burying the medical titanium alloy sample in a carbonate solid gas carburizer powder (the components are 5-15% of sodium carbonate, 10% of barium carbonate, 5% of calcium carbonate, and 70-80% of charcoal), placing in a well-shaped heating furnace and heating to 980-1280 DEG C with the heating speed of 10 DEG C / min-20 DEG C / min, insulating for 2 hours-4 hours and cooling in furnace; 3)cooling the temperature in the furnace chamber to 25 DEG C, taking the medical titanium alloy TC4 sample; and 4)polishing the surface to surface roughness Ra of 0.020 to obtain the titanium alloy carburizing sample, wherein the surface titanium carbide ceramic thickness is 50-250 micrometers. The medical titanium alloy high temperature solid carburizing technology has the advantages of simple operation and saved energy, can effectively improve the hydrogen embrittlement problem generated by traditional carburizing, wear resistance is increased, and abrasive dust is reduced.

Description

Technical field [0001] The invention relates to a metal material surface carburizing process, in particular to a medical titanium alloy high-temperature solid carburizing process. Background technique [0002] Among the biomedical metal materials, titanium alloys have gradually become the substitutes and restorations of human hard tissues such as dental implants, bone trauma products, and artificial joints due to its excellent biocompatibility, corrosion resistance, comprehensive mechanical properties and process performance. Preferred material. Among them, TC4 is more and more widely used due to its excellent biocompatibility, good corrosion resistance and elastic modulus close to human bones, and is widely used in artificial joints and medical devices. However, the biggest problem faced by medical titanium alloy as an artificial joint material is its low hardness and poor wear resistance. These shortcomings greatly limit the service life of titanium alloy artificial joints. T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C8/64
CPCC23C8/64
Inventor 罗勇刘星星刘秋真陈文文许浩
Owner CHINA UNIV OF MINING & TECH