Preparing method for powder metallurgy high-entropy alloy based composite material

A high-entropy alloy and composite material technology, which is applied in the field of powder metallurgy material preparation, can solve the problems of difficult to control the phase composition of composite materials, reduce the strength of composite materials, and difficult to ensure high-purity high-entropy alloys of composite materials, etc. Entropy alloy matrix interface is well bonded, high specific rigidity and wear resistance and corrosion resistance, and the effect of reinforcement and matrix interface bonding is good

Inactive Publication Date: 2016-07-06
CENT SOUTH UNIV
4 Cites 38 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0003] Chinese patent (application number: 200810063807.4, 2008) developed a TiB 2 The high-entropy alloy-based composite material is a reinforcing phase, and its preparation methods include arc melting, induction melting, self-propagating-melting casting or powder metallurgy manufacturing, among which three methods such as electric arc melting, induction melting, and self-propagating-melting casting are uniform It is to melt the matrix material of the high-entropy alloy into a liquid, and then add the reinforcement phase to the melt to stir and cast it. These methods generally have the uneven composition of the high-entropy alloy matrix in the composite material and serious branching. Grain segregation, while the reinforcements appear to agglomerate and distribute unevenly, and at the same time, different degrees of reactions will occur between the matrix phase and the reinforcement, resulting in harmful phases at the interface between the matrix and the reinforcement of the composite material, reducing the strength of the composite material. ; and adopt powder metallurgy process to prepare high entropy alloy matrix composite material, this method is: (1) put TiB 2 Reinforcing phase and Al, Cu, Ni, Co, Ti and other metals that make up the high-entropy alloy ar...
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

Abstract

The invention relates to a preparing method for a powder metallurgy high-entropy alloy based composite material, and belongs to the field of powder metallurgy materials. The preparing method includes the steps that all components are prepared and taken according to component proportions of a designed high-entropy alloy matrix, and high-entropy alloy powder is prepared through a gas atomization method; and then according to the component proportions of the designed high-entropy alloy based composite material, the high-entropy alloy powder and wild phase titanium diboride powder are prepared and taken, and rapid sintering molding is achieved after even mixing is carried out. According to the preparing method, the atomization method is adopted for preparing spherical high-entropy alloy powder with relatively-even ingredients in advance, and therefore a simple solid solution phase structure of a high-entropy alloy is guaranteed; and discharging plasma rapid sintering is adopted for preparing the needed powder metallurgy high-entropy alloy based composite material, and therefore the shortcoming that the material is prepared with metal powder as a raw material through a powder metallurgy method traditionally, and consequently the high-entropy alloy of the simple solid solution structure is difficult to obtain is overcome. The preparing method is simple in process procedure; according to the prepared powder metallurgy high-entropy alloy based composite material, titanium diboride is evenly distributed, reinforcement and base body interface bonding is better, the comprehensive performance is more excellent, the specific strength is high, the specific rigidity is high, and the abrasive resistance and the corrosion resistance are excellent. The preparing method is suitable for industrial production.

Application Domain

Technology Topic

Image

  • Preparing method for powder metallurgy high-entropy alloy based composite material
  • Preparing method for powder metallurgy high-entropy alloy based composite material
  • Preparing method for powder metallurgy high-entropy alloy based composite material

Examples

  • Experimental program(6)
  • Comparison scheme(1)

Example Embodiment

[0048] Example 1
[0049] Prepared into a volume fraction of 5% TiB 2 Enhanced Al 20 Fe 20 Cr 20 Co 20 Ni 20 High-entropy alloy-based composite material. 1) Preparation of spherical Al 20 Fe 20 Cr 20 Co 20 Ni 20 High-entropy alloy powder (mole fraction), the raw material is made of bulk metal materials such as high-purity Al, high-purity Fe, high-purity Cr, high-purity Co, and high-purity Ni. It is melted into a melt at 1600℃ in an intermediate frequency induction melting furnace. High-purity argon with a flow rate of 200L/s and a pressure of 6MPa, 10 6 It is atomized into spherical high-entropy alloy powder with a diameter of 30 to 1 micron under K/s cooling rate. 2) According to the volume fraction of 5% TiB 2 And 95% Al 20 Fe 20 Cr 20 Co 20 Ni 20 High-entropy alloy weighing TiB with an average diameter of 1 micron 2 Powder and average diameter of 10 microns Al 20 Fe 20 Cr 20 Co 20 Ni 20 High-entropy alloy powder, the powder is uniformly mixed on a ball mill, and then sintered in FCT-HPD25 spark plasma sintering. The sintering temperature is 1000℃, the sintering pressure is 30MPa, and the sintering time is 10min. The compressive strength of the sintered composite material reaches 2400MPa, the yield strength reaches 1500MPa, and the density of the material reaches 99%.

Example Embodiment

[0050] Example 2
[0051] Prepared into a volume fraction of 25% TiB 2 Enhanced Al 25 Fe 15 Cr 15 Co 15 Ni 20 Ti 5 Cu 5 High-entropy alloy-based composite material. 1) Preparation of spherical Al 25 Fe 15 Cr 15 Co 15 Ni 20 Ti 5 Cu 5 High-entropy alloy powder (molar fraction), the raw materials are made of bulk metal materials such as high-purity Al, high-purity Fe, high-purity Cr, high-purity Co, high-purity Ni, high-purity Ti, and high-purity Cu, in an intermediate frequency induction melting furnace 1800 Melt into a melt at ℃, the melt is in high purity argon with a gas flow of 80L/s and a pressure of 4.5MPa, 10 4 It is atomized into spherical high-entropy alloy powder with a diameter of 50-5 microns at a cooling rate of K/s. 2) According to the volume fraction 25% TiB 2 And 75% Al 25 Fe 15 Cr 15 Co 15 Ni 20 Ti 5 Cu 5 High-entropy alloy weighing TiB with an average diameter of 10 microns 2 Powder and Al with an average diameter of 20 microns 25 Fe 15 Cr 15 Co 15 Ni 20 Ti 5 Cu 5 High-entropy alloy powder, the powder is uniformly mixed on a ball mill, and then sintered in FCT-HPD25 spark plasma sintering. The sintering temperature is 1300℃, the sintering pressure is 45MPa, and the sintering time is 15min. The compressive strength of the sintered composite material reached 2630MPa, the yield strength reached 1850MPa, and the density of the material reached 99.4%.

Example Embodiment

[0052] Example 3
[0053] Prepared into a volume fraction of 20% TiB 2 Enhanced Al 15 Fe 25 Cr 20 Co 15 Ni 15 Ti 10 High-entropy alloy-based composite material. 1) Preparation of spherical Al 15 Fe 25 Cr 20 Co 15 Ni 15 Ti 10 High-entropy alloy powder (mole fraction), the raw materials are made of bulk metal materials such as high-purity Al, high-purity Fe, high-purity Cr, high-purity Co, high-purity Ni, and high-purity Ti, which are melted in an intermediate frequency induction melting furnace at 2000°C The melt is in high purity argon with a gas flow of 140L/s and a pressure of 6MPa, 10 5 It is atomized into spherical high-entropy alloy powder with a diameter of 40 to 1 micron at a cooling rate of K/s. 2) 20% TiB according to volume fraction 2 And 80% Al 15 Fe 25 Cr 20 Co 15 Ni 15 Ti 10 High-entropy alloy weighing TiB with an average diameter of 5 microns 2 Powder and average diameter of 15 microns Al 15 Fe 25 Cr 20 Co 15 Ni 15 Ti 10 High-entropy alloy powder, the powder is uniformly mixed on a ball mill, and then sintered in FCT-HPD25 spark plasma sintering. The sintering temperature is 1200℃, the sintering pressure is 60MPa, and the sintering time is 10 minutes. The compressive strength of the sintered composite material reached 2550MPa, the yield strength reached 2130MPa, and the density of the material reached 99.8%.
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
Diameter5.0µm
Compressive strength1520.0mPa
Yield strength980.0mPa
tensileMPa
Particle sizePa
strength10

Description & Claims & Application Information

We can also present the details of the Description, Claims and Application information to help users get a comprehensive understanding of the technical details of the patent, such as background art, summary of invention, brief description of drawings, description of embodiments, and other original content. On the other hand, users can also determine the specific scope of protection of the technology through the list of claims; as well as understand the changes in the life cycle of the technology with the presentation of the patent timeline. Login to view more.
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

Similar technology patents

Crystalline state alloy spherical particle/amorphous alloy base composite material and manufacturing method thereof

InactiveCN101220444AEvenly distributedMinimize the effect of forming abilityAlloy elementAmorphous metal
Owner:INST OF METAL RESEARCH - CHINESE ACAD OF SCI

Hair drying device

InactiveUS20140144037A1Evenly distributedAirflow limitationHair dryingRestricted AirflowEngineering
Owner:HADDEN DAVID M

Classification and recommendation of technical efficacy words

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