Core-shell structure carbon-coated titanium and titanium alloy composite powder and preparation method thereof

A composite powder, core-shell structure technology, used in metal processing equipment, transportation and packaging, gaseous chemical plating, etc., can solve problems such as damage to the second phase strengthening effect of titanium matrix, brittle fracture of materials, and fragile two-phase interface. , to achieve the effect of good industrialization prospect, low production cost and good integrity

Active Publication Date: 2018-03-23
INST OF PROCESS ENG CHINESE ACAD OF SCI
View PDF8 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the titanium-based composites prepared by the above method have the following disadvantages that restrict their application in engineering: (1) The reinforcement phase is not uniformly distributed in the matrix, resulting in unsatisfactory second phase strengthening effect or even occurrence of Segregation causes brittle fracture of the material; (2) The introduction of a large amount of impurities such as oxygen and nitrogen during the mechanical mixing process of the powder raw materials leads to a very fragile two-phase interface between the reinforcing phase and the matrix; (3) the structure of the carbon nanotubes is complete properties are destroyed during mechanical mixing, compromising their second phase strengthening effect on the titanium matrix

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Core-shell structure carbon-coated titanium and titanium alloy composite powder and preparation method thereof
  • Core-shell structure carbon-coated titanium and titanium alloy composite powder and preparation method thereof
  • Core-shell structure carbon-coated titanium and titanium alloy composite powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0034] As another aspect of the present invention, a method for preparing a core-shell structure carbon-coated titanium and titanium alloy composite powder is provided, comprising the following steps:

[0035] (1) Add the oxygen scavenger to the fluidized bed in the oxygen removal system, add the powder raw material to the fluidized bed of the chemical vapor deposition system, check the airtightness of the reaction device, and then pass high-purity inert gas to exhaust the air in the device;

[0036] (2) The fluidized bed in the oxygen removal system and the fluidized bed in the chemical vapor deposition system are placed in their respective heating equipment that reaches the preset reaction temperature. After stabilization, the flow rate of the inert gas is reduced, and at the same time, high-purity Acetylene and high-purity hydrogen for chemical vapor deposition reaction;

[0037] (3) After the chemical vapor deposition reaction, stop the flow of high-purity hydrogen and hi...

Embodiment 1

[0048] (1) Raise the muffle furnace in the oxygen removal system and the muffle furnace in the fluidized bed chemical vapor deposition system to 450°C and 650°C respectively;

[0049] (2) Use a cylindrical quartz fluidized bed with an inner diameter and a distribution plate diameter of 20mm as the oxygen removal reactor, and use a nested quartz fluidized bed as the chemical vapor deposition reactor, and the outer tube is a cylindrical quartz tube with a diameter of 40mm , the inner tube is a conical fluidized bed, the cone angle is 15°, and the diameter of the distribution plate is 20mm. The aperture diameter of the distribution plate of the above two fluidized beds is 200 μm, and the diameter of the inlet and outlet holes of the fluidized bed is 6 mm;

[0050] (3) Hydrodehydrogenation non-spherical titanium powder with a particle size of 48 μm is used as an oxygen scavenger, the purity is higher than 98.5% (mass fraction), and the weight is 8 g; the hydrogenated dehydrogenati...

Embodiment 2

[0057] Concrete experimental procedure is with embodiment 1, and difference is only in:

[0058] (1) Hydrodehydrogenated TC4 titanium alloy powder with a particle size of 74 μm is used as the chemical vapor deposition coating substrate, with a weight of 12 g;

[0059] (2) the proportioning of mixed gas is changed from argon: acetylene: hydrogen=400sccm: 80sccm: 80sccm to argon: acetylene: hydrogen=250sccm: 125sccm: 125sccm, and the reaction time is changed from 60min to 30min;

[0060] image 3 It is the scanning electron microscope picture of the carbon-coated TC4 titanium alloy composite powder in Example 2. It can be seen from the figure that a large number of carbon nanotubes or carbon nanorods grow on the surface of the TC4 titanium alloy powder, and the length of the carbon nanotubes and carbon nanorods is more than 2 μm, evenly distributed.

[0061] Figure 4 It is the X-ray diffraction analysis diagram of the carbon-coated TC4 titanium alloy composite powder in Exam...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
Login to view more

Abstract

The invention discloses core-shell structure carbon-coated titanium and titanium alloy composite powder and a preparation method thereof. The composite powder takes titanium or titanium alloy powder as a core and takes one or more than one carbon substances including graphite particles, carbon nano-tubes, carbon nano-rods and amorphous carbon as a shell. The preparation method of the composite powder disclosed by the invention is implemented through a fluidized bed chemical vapor deposition technology; and the composite powder body has the advantages that a product is pure and low in impuritycontent, a carbon coating layer has a high binding force with a titanium substrate and is not prone to dropping, carbon substances are uniformly distributed on the surface of the powder, and the content is controllable. The composite powder can be directly used as a production raw material for a carbon-reinforced titanium-based composite material and can solve the problems that a traditional powder metallurgical technology for preparing a titanium-based composite material causes uneven distribution of carbon-rich phases, the number density is difficult to control, and the impurity content is too high.

Description

technical field [0001] The invention relates to a core-shell structure carbon-coated titanium and titanium alloy composite powder and a preparation method thereof, belonging to the technical field of titanium-based composite material raw materials. Background technique [0002] Titanium-based composites have many advantages such as high specific strength, excellent corrosion resistance and high-temperature mechanical properties, and are expected to be widely used in high-tech fields such as the automotive industry, aerospace, marine engineering, and biomedicine. Studies have shown that due to the good compatibility between titanium carbide and carbon nanotubes and titanium matrix, it also has excellent high-temperature mechanical properties, corrosion resistance, high-temperature thermal stability, etc., so it is very suitable as a titanium-based composite material. enhanced phase. At present, titanium powder or titanium alloy powder raw materials are uniformly mixed with c...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02C23C16/26
CPCB22F1/0007C23C16/26B22F1/16
Inventor 杨亚锋李少夫朱庆山谭冲
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap