Unlock instant, AI-driven research and patent intelligence for your innovation.

Powder granulating method

A powder and granulation technology, applied in the field of powder metallurgy, can solve the problems of material pollution and achieve the effect of ensuring uniformity

Inactive Publication Date: 2014-04-02
浙江帕特尼触头有限公司
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the future production process requirements, the powder needs to have a certain fluidity and bulk density, which requires granulation of the original mixed powder; and the existing granulation method mainly uses the addition of a binder for granulation , due to the addition of binders, it is inevitable to pollute the material, and in the subsequent production process (such as sintering, thermal spray welding, thermal spraying, etc.) to generate smoke and gas, which will affect the material and human body, especially Mixed powders containing oxide materials (such as silver tin oxide, silver zinc oxide, etc.) have a greater impact, because most of the binder decomposition product is a reducing atmosphere, which can reduce the oxide

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment one: a kind of method of silver carbon (AgC4) powder granulation, the electrolytic silver powder (-300 order) of 96% (weight percent) is mixed with the graphite (average particle diameter 1 μ m) of 4%, mix powder in Press it into a compact in the mold (compressed relative density is about 80%), crush the compact into granules with a particle size of 0.2-0.6mm, put the granules into an inert atmosphere sintering furnace at 550°C for sintering, and hold the time After 2 hours, cool to room temperature and take it out. The sintered granules are crushed in a pulverizer, and then passed through a sieve of 80 mesh and 320 mesh. It is required to continue pressing, crushing, sintering, crushing, and sieving until the obtained powder has good fluidity and uniform composition.

Embodiment 2

[0014] Embodiment two: [0010] a kind of silver tin oxide [AgSnO2 (12)] powder granulation method, the silver tin oxide of co-precipitation is mixed, mixed powder is pressed into compact in mold (compression relative density is about 75%), crush the agglomerate into granules with a particle size of 0.2-0.6 mm, put the granules into a sintering furnace with an oxidizing atmosphere and sinter at 600 ° C, hold for 2 hours, cool to room temperature, take out, and the sintered granules The granules are crushed in the pulverizer, and then passed through 80 mesh sieve and 320 mesh sieve, the powder on the 80 mesh sieve continues to be crushed, and the powder below 320 mesh is re-granulated, that is, the pressing, crushing, sintering, crushing, and passing are continued according to the above requirements. Sieve until the obtained powder has good fluidity and uniform composition.

Embodiment 3

[0015] Embodiment three: a kind of method of silver tungsten [AgW (50)] powder granulation, with the electrolytic silver powder (-300 order) of 50% (weight percentage) and the tungsten powder (average particle diameter 5 μ m) of 50% (weight percentage) ) for mixing, the mixed powder is pressed into a compact in a mold (compressed relative density is about 60%), the compact is crushed into granules with a particle size of 0.2-0.6mm, and the granules are put into a sintering furnace with an inert atmosphere Sinter at 750°C, hold for 2 hours, cool to room temperature and take it out. The sintered particles are crushed in the pulverizer, and then pass through 80 mesh sieve and 320 mesh sieve. The powder on the 80 mesh sieve continues to be crushed. Re-granulate, that is, continue to press, pulverize, sinter, pulverize, and sieve according to the above requirements until the obtained powder has good fluidity and uniform composition.

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 diameteraaaaaaaaaa
particle sizeaaaaaaaaaa
particle diameteraaaaaaaaaa
Login to View More

Abstract

Disclosed is a powder granulating method. The method includes pressing powder to be a blank block under certain pressure, and smashing the blank block to be particles of certain size; placing the particles into a sintering furnace with certain atmosphere or vacuum, sintering at certain temperature, and smashing and grinding the particles after being sintered to be powder with certain particle size and fluidity. Compared with the prior art, the powder granulating method has the advantages that no binder is added, so that raw materials are unaffected; when powder flows or is quickly melted in the subsequent process, ingredients of a mixture cannot segregate, so that uniformity of the ingredients and diffuse distribution of substances are guaranteed. The powder granulating method is specially suitable for metallurgy of powder with metal materials as main ingredients.

Description

technical field [0001] The invention relates to a powder granulation method, in particular to a powder granulation method in the field of powder metallurgy. Background technique [0002] In powder metallurgy materials, it is required that each phase or each substance is evenly distributed and the particles are fine, so as to improve the performance of the material. This requires the original powder to be fine, and some are even nano-powders. After the powder is mixed, the particle size is fine and the powder does not have fluidity. However, in the future production process requirements, the powder needs to have a certain fluidity and bulk density, which requires granulation of the original mixed powder; and the existing granulation method mainly uses the addition of a binder for granulation , due to the addition of binders, it is inevitable to pollute the material, and in the subsequent production process (such as sintering, thermal spray welding, thermal spraying, etc.) to...

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): B22F1/00
Inventor 冯继明蒋贤雷陈少贤陈克
Owner 浙江帕特尼触头有限公司