A kind of manganese source powder with core-shell structure for powder metallurgy and preparation method thereof

A technology of core-shell structure and powder metallurgy, which is applied in the field of powder metallurgy, can solve the problems of low oxygen content mechanical properties, manganese-containing low alloy steel, reduce the oxidation degree of manganese source powder, and high manganese content, and achieve good oxidation resistance and easy parameters control, nitrogen content controllable effect

Inactive Publication Date: 2017-03-29
CENT SOUTH UNIV
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the iron-manganese master alloy powder still faces some problems in the application process, such as due to the high manganese content, the iron-manganese master alloy powder still has a certain degree of oxidation in the atmosphere
[0008] Through a comprehensive analysis of the prior art, the inventor proposed to use a nitride shell to coat the manganese source powder to reduce the oxidation degree of the manganese source powder during transportation, powder mixing and pressing, and finally obtain low oxygen content and high mechanical properties The technical scheme of manganese-containing low-alloy steel has not been reported at home and abroad so far

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
  • A kind of manganese source powder with core-shell structure for powder metallurgy and preparation method thereof
  • A kind of manganese source powder with core-shell structure for powder metallurgy and preparation method thereof
  • A kind of manganese source powder with core-shell structure for powder metallurgy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Pass 100g of electrolytic manganese powder with a content greater than 99% through a 300-mesh sieve, and put it into a 40×20×12mm 3 In the porcelain boat, and then put the porcelain boat into the high temperature electrolytic furnace. The heating rate is 20°C / min, and the porcelain boat is kept at a temperature of 600°C for 60, 90, 120, and 180 minutes, and the atmosphere is 75% H 2 +25%N 2 , the pressure is normal pressure, and the gas flow rate is 3L / min. After the holding time is over, push the porcelain boat to the water circulation cooling area to cool for 15 minutes and then take it out. The measured nitrogen content of the manganese nitride powder is shown in Table 1.

[0046] Table 1 Effect of treatment process on nitrogen content of manganese-containing powder

[0047]

Embodiment 2

[0049] Ball mill FeMn (manganese content is 76%) alloy powder for 1h, the median diameter of the powder after ball milling is 21.72μm, weigh 100g of FeMn alloy powder after ball milling, and pack it into 40×20×12mm 3 In the porcelain boat, and then put the porcelain boat into the high temperature electrolytic furnace. The heating rate is 20°C / min, the porcelain boat is kept at 600°C for 60 and 180min, and the atmosphere is 75% H 2 +25%N 2 , the pressure is normal pressure, and the gas flow rate is 3L / min. After the holding time is over, push the porcelain boat to the water circulation cooling area to cool for 15 minutes and then take it out. The measured nitrogen content of the iron-manganese nitride powder is shown in Table 2.

[0050] Table 2 Effect of nitriding treatment on nitrogen content of manganese-containing powder

[0051]

Embodiment 3

[0053] Pass 100g of electrolytic manganese powder with a content greater than 99% through a 300-mesh sieve, and put it into a 40×20×12mm 3 In the porcelain boat, and then put the porcelain boat into the high temperature electrolysis furnace. The heating rate is 5°C / min, the porcelain boat is kept at a temperature of 600°C for 12 hours, and the atmosphere is 75%H 2 +25%N 2 , the pressure is normal pressure, the gas flow rate is 3L / min, after the holding time is over, it is cooled with the furnace, and the circulation of nitrogen-containing atmosphere is maintained during the cooling process. The nitrogen content and oxygen content of the manganese nitride powder were measured to be 3.50% and 0.702%, respectively.

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
diameteraaaaaaaaaa
diameteraaaaaaaaaa
diameteraaaaaaaaaa
Login to view more

Abstract

The invention discloses manganese source powder adopting a core-shell structure and used for powder metallurgy and a preparation method of the manganese source powder. The core-shell structure of the manganese source powder comprises an inner core formed by manganese particles and a nitride shell, wherein the manganese particles are selected from one of electrolytic manganese powder, ferro-manganese prealloy powder and ferro-manganese master alloy powder; nitride is generated by the manganese particles in situ in nitrogen-containing gas at the temperature below 800 DEG C. The preparation method comprises steps as follows: the manganese particles are put in a heating furnace and heated to 600-800 DEG C, subjected to thermal insulation for at least 60 minutes and then cooled, and the manganese source powder adopting the core-shell structure is obtained; nitrogen-containing gas is introduced into the furnace all the time in the heating, thermal insulation and cooling processes. The preparation method is simple, the prepared manganese source powder adopting the core-shell structure has good oxidation resistance at the normal temperature, the nitrogen content is controllable and is lower, and small influences are produced on compressibility of iron-based powder after the manganese source powder is added. With the adoption of the manganese source powder adopting the core-shell structure, a manganese-containing low-alloy steel sintering product with high density, low oxygen content and excellent comprehensive mechanical property can be prepared.

Description

technical field [0001] The invention relates to a manganese source powder with a core-shell structure for powder metallurgy and a preparation method thereof, belonging to the technical field of powder metallurgy. Background technique [0002] In industrial production, more and more metal parts are prepared by powder metallurgy to achieve energy saving, material reduction and less processing. Among them, iron-based powder metallurgy materials account for more than 70% of powder metallurgy applications. Due to the needs of industrial applications, the single use of water atomized pure iron powder as the raw material for the production of iron-based powder metallurgy materials cannot meet the final performance requirements. Therefore, alloying elements are usually added to water atomized pure iron powder in the form of pre-alloying or pre-mixing to improve its mechanical properties. Water atomized pure iron powder generally contains a small amount of Mn, which is brought in by...

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 Patents(China)
IPC IPC(8): B22F1/02C22C22/00C22C38/04
Inventor 李松林陈荟竹龙安平杨英杰欧阳齐
Owner CENT SOUTH UNIV
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