Sintering powder

Patent metadata

Field	Value
Publication number	US-10259980-B2
Application number	US-201314438888-A
Country	US
Kind code	B2
Filing date	Oct 29, 2013
Priority date	Oct 29, 2012
Publication date	Apr 16, 2019
Grant date	Apr 16, 2019

Abstract

A sintering powder comprising: a particulate having a mean longest diameter of less than 10 microns, wherein at least some of the particles forming the particulate comprise a metal at least partially coated with a capping agent. A sintering paste and sintering film comprising the sintering powder. A method for making a sintered joint by sintering the sintering powder, paste, or film in the vicinity of two or more workpieces.

First claim

The invention claimed is:

1. A sintering powder comprising:
a particulate comprising heterogeneous particles having a mean longest diameter of less than 10 microns, wherein at least some of the particles forming the particulate comprise a metal at least partially coated with a capping agent, wherein the particulate comprises a first type of particles having a longest diameter of from 1 to 100 nm and a second type of particles having a longest diameter of from greater than 100 nm to 50 microns, and wherein the particulate comprises from 81 to 99 wt % of the first type of particles and from 1 to 19 wt % of the second type of particles.

2. The sintering powder of claim 1 wherein the capping agent comprises an amine and/or a carboxylate functional group.

3. The sintering powder of claim 2 wherein the capping agent comprises a straight chain or branched chain aliphatic amine.

4. The sintering powder of claim 2 wherein the metal comprises silver or an alloy thereof.

5. The sintering powder of claim 2 comprising from 0.1 to 3 wt % capping agent.

6. The sintering powder of claim 1 , wherein the first type of particles have a diameter of from 5 to 75 nm and/or the second type of particles have a diameter of from greater than 100 nm to 20 microns.

7. The sintering powder of claim 5 , wherein the particulate has a mean longest diameter of from 1 to 100 nm.

8. The sintering powder of claim 5 , wherein the particulate has a mean longest diameter of from 100 nm to 10 microns.

Assignees

• Alpha Assembly Solutions Inc

Inventors

• Ghosal Shamik
• Pandher Ranjit
• Khaselev Oscar
• Bhatkal Ravi
• Raut Rahul
• Singh Bawa
• Ribas Morgana
• Sarkar Siuli
• Mukherjee Sutapa
• Kumar Sathish
• Chandran Remya
• Vishwanath Pavan
• Pachamuthu Ashok
• Boureghda Monnir
• Desai Nitin
• Lifton Anna
• Chaki Nirmalya Kumar

Classifications

• B22F1/052 Primary

  characterised by a mixture of particles of different sizes or by the particle size distribution · CPC title

• B22F1/054

  Nanosized particles · CPC title

• B22F1/103

  containing an organic binding agent comprising a mixture of, or obtained by reaction of, two or more components other than a solvent or a lubricating agent · CPC title

• B22F1/102

  Metallic powder coated with organic material · CPC title

• B22F1/10

  Metallic powder containing lubricating or binding agents; Metallic powder containing organic material · CPC title