Method for removing prior particle boundary and hole defect of powder metallurgy high-temperature alloy

Patent metadata

Field	Value
Publication number	US-2017216919-A1
Application number	US-201615514826-A
Country	US
Kind code	A1
Filing date	Mar 8, 2016
Priority date	Mar 9, 2015
Publication date	Aug 3, 2017
Grant date	—

Abstract

A method for removing prior particle boundaries and hole defects of a powder metallurgy high-temperature alloy. The method includes performing mechanical ball milling treatment on an atomized powder, thermosetting the powder to form a shape, and preparing a powder metallurgy high-temperature alloy.

First claim

1 . A method for removing prior particle boundaries and hole defects of a powder metallurgy high-temperature alloy, comprising: first performing mechanical ball milling treatment on high-temperature alloy powder prepared by using an atomization method to prepare surface activated solid powder, then thermosetting the powder to form a shape, and preparing a powder metallurgy high-temperature alloy.

2 . The method for removing prior particle boundaries and hole defects of a powder metallurgy high-temperature alloy according to claim 1 , wherein granularity of the atomized alloy powder is less than or equal to 150 μm.

3 . The method for removing prior particle boundaries and hole defects of a powder metallurgy high-temperature alloy according to claim 1 , wherein in ball milling, a used ball mill is one of a planetary ball mill, a stirring ball mill, and a roller drum ball mill.

4 . The method for removing prior particle boundaries and hole defects of a powder metallurgy high-temperature alloy according to claim 3 , wherein ball milling is performed under protection of an inert gas.

5 . The method for removing prior particle boundaries and hole defects of a powder metallurgy high-temperature alloy according to claim 3 , wherein atomized powder is put into a ball mill pot with a ball-to-powder ratio of: (8-12): 1, and ball milling is performed in a planetary ball mill for 1-4 h at a ball milling rotation speed of 250-350 r/min.

6 . The method for removing prior particle boundaries and hole defects of a powder metallurgy high-temperature alloy according to claim 3 , wherein atomized powder is put into a ball mill pot with a ball-to-powder ratio of: (8-15): 1, and ball milling is performed in a stirring ball mill for 2-6 h at a ball milling rotation speed of 60-150 r/min.

7 . The method for removing prior particle boundaries and hole defects of a powder metallurgy high-temperature alloy according to claim 4 , wherein thermosetting forming uses one forming manner of hot iso-hydrostatic forming, hot extrusion forming, and plasma sintering forming.

8 . The method for removing prior particle boundaries and hole defects of a powder metallurgy high-temperature alloy according to claim 7 , wherein a processing parameter of the hot iso-hydrostatic forming is 1000-1250° C./100-150 MPa/4 h; processing parameters of the hot extrusion forming are: performing hot extrusion forming at 900-1200° C.; an extrusion ratio of the hot extrusion forming is (6-15): 1; and a processing parameter of the plasma sintering forming is: 1000-1250° C./40-150 MPa/5-10 min.

9 . The method for removing prior particle boundaries and hole defects of a powder metallurgy high-temperature alloy according to claim 8 , wherein solution treatment and aging treatment are performed on a material of the high-temperature alloy formed by thermosetting.

10 . The method for removing prior particle boundaries and hole defects of a powder metallurgy high-temperature alloy according to claim 9 , wherein processing parameters of the solution treatment are: performing heat preservation for 1-2 h at 1000-1250° C., and performing air cooling; and processing parameters of the aging treatment are: performing heat preservation for 4-10 h at 700-900° C., and performing air cooling.

11 . The method for removing prior particle boundaries and hole defects of a powder metallurgy high-temperature alloy according to claim 1 , wherein thermosetting forming uses one forming manner of hot iso-hydrostatic forming, hot extrusion forming, and plasma sintering forming.

12 . The method for removing prior particle boundaries and hole defects of a powder metallurgy high-temperature alloy according to claim 2 , wherein thermosetting forming uses one forming manner of hot iso-hydrostatic forming, hot extrusion forming, and plasma sintering forming.

13 . The method for removing prior particle boundaries and hole detects of a powder metallurgy high-temperature alloy according to claim 3 , wherein thermosetting forming uses one forming mariner of hot iso-hydrostatic forming, hot extrusion forming, and plasma sintering forming.

14 . The method for removing prior particle boundaries and hole defects of a powder metallurgy high-temperature alloy according to claim 5 , wherein thermosetting forming uses one forming manner of hot iso-hydrostatic forming, hot extrusion forming, and plasma sintering forming.

15 . The method for removing prior particle boundaries and hole defects of a powder metallurgy high-temperature alloy according to claim 6 , wherein thermosetting forming uses one forming manner of hot iso-hydrostatic forming, hot extrusion forming, and plasma sintering forming.

Assignees

• Univ Central South

Inventors

• Liu Zuming
• Su Pengfei
• Huang Boyun
• Duan Qinglong
• Guo Yang
• Ma Mengmei

Classifications

• B22F9/04

  starting from solid material, e.g. by crushing, grinding or milling ({C22C1/1084 takes precedence}; crushing, grinding or milling, in general, see the relevant subclasses, e.g. B02C) · CPC title

• B22F2998/10

  Processes characterised by the sequence of their steps · CPC title

• B22F3/12 Primary

  Both compacting and sintering (by forging B22F3/17) · CPC title

• C22C1/04

  by powder metallurgy (C22C1/08 takes precedence) · CPC title