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Four common metal conductive powders

Conductive materials can conduct current well because they have a large number of charged particles that can move freely under the action of an electric field, including conductor and superconducting materials.

The following are the four most widely used metal conductive materials.

Pure silver conductive powder (Ag99.99%)

1) Flake:

Common available particle size: <1um, 1-3um, 3-5um, 5-8um, 8-10um, particle size, and apparent density can be customized according to requirements. Flake silver powder with low apparent is available.

Appearance: silver gray with metallic luster

Application: Flake silver powder is a high-performance conductive filler material with good oxidation resistance. Flake Ag particle is the main raw material for making conductive coatings, membrane switches, conductive inks, conductive rubber, conductive plastics, and conductive ceramics.

Flake Ag powder is an ideal raw material for good low-temperature polymer slurry, conductive paint and electromagnetic shielding paint. The coating prepared with flake silver powder has good fluidity, anti-settling and large spray area.

2) Spherical silver conductive powder:

Common particle size: <1um, 1-3um, 3-5um，5-8um，etc

Application: Near-spherical silver powder is mainly used as conductive filler for high-temperature sintered conductive paste.

There is no absolute standard for silver powder as a conductive filler. The choice of silver powder should be based on the corresponding adhesive, the target conductor material, the physical and chemical properties of the film, and the reliability requirements.

 

Silver coated copper conductive powder (common particle size is 1-3um, 3-5um, 5-8um, 10um, Ag content ranges from 3%-35%)

Features:

1) Silver coated copper powder has adjustable superfine particle size.

2) Ag coated Cu powder has several shapes, such as spherical, flake, dendritic, etc.

3) Silver-coated copper powder has excellent conductivity and lower cost, which can replace some applications of pure silver powder.

4) Silver-coated copper powder has good oxidation resistance and dispersion, and can be used in medium and low temperature slurry.

Application range: It can be widely used in conductive adhesives, conductive coatings, polymer pastes, and various industries that require electrical conductivity and static electricity, electromagnetic shielding, and surface metallization of non-conductive materials.

Silver-coated copper powder can be widely used in conductive adhesives, conductive coatings, polymer pastes, and various fields of microelectronics technology that need to conduct electricity and static electricity, and non-conductive materials surface metallization. It is a new type conductive composite powder. Ag-Cu powder is widely used in the fields of electrical conductivity and electromagnetic shielding in various industries such as electronics, electromechanics, communications, printing, aerospace, and military industries, such as computers, mobile phones, integrated circuits, various electrical appliances, electronic medical equipment, electronic instruments, etc., so that products are not interfered by electromagnetic waves, while reducing the harm caused by electromagnetic radiation to the human body, as well as the conductivity of colloids, circuit boards, and other insulators, to make the insulated object have good electrical conductivity.

 

Pure copper powder (Cu 99%+)

Common particle size: <1um, 1-3um, 3-5um, 5-8um, etc.

Features: spherical and flake shape, uniform particle size, good dispersion, high crystallinity

Applications: Manufacture of terminals and internal electrodes of multilayer ceramic capacitors(MLCC), electronic components and electronic pastes, etc.

Pure nickel powder (Ni 99.7%): Common particle size: 1-3um

As a functional conductive filler, nickel powder can be added in coatings, adhesives, inks, plastics, rubbers, and can be made into conductive, electromagnetic shielding, anti-static  products, to be used in electronics, electromechanics, communications, printing, aerospace, weapons and other industrial sectors in the field of electrical conductivity. Such as computers, mobile phones, electronic medical equipment, electronic instruments and meters.

Guangzhou Hongwu Material Technology Co., Ltd. supplies the conductive materials mentioned above, with reliable high and stable quality, reasonable prices and excellent customized service.

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Application of nano-powder in lubrication:

Nano tin(Sn), indium(In), bismuth(Bi) powder:
The melting points of tin, indium, bismuth and their alloys are all below 300 ° C. Many organic solvents have boiling points above this temperature and can be stable for a long time, so it is easy to find a suitable reaction medium. Tin, indium and antimony nanoparticles have attracted much attention in the field of friction due to their special physicochemical properties and small particle size. The use of nanoparticles as lubricant additives is a research hotspot in the field of lubrication. Studies have shown that nanoparticles have different lubrication properties than traditional organic lubricant additives due to their composition and structural characteristics. Specifically in the following three aspects:
(1) The nanoparticles are mostly spherical, and they may act like a “ball bearing” between the frictional faces, thereby effectively improving the tribological properties of the lubricating oil;
(2) Under heavy load and high temperature, the nanoparticles between the frictional faces may be flattened to form a sliding system, thereby reducing friction and wear;
(3) Nanoparticles can be filled in the pits and damage sites on the surface of the workpiece, making it possible to repair the surface of the friction surface in situ. Metal nanoparticle lubricants combined with the combination of the above three mechanisms of nanoparticles are considered to be the most likely to be a new generation of lubricant additives.

Nano Copper(Cu) powder:
The nano-copper powder in the nano-copper powder lubricating oil additive acts as a buffer on the surface of the friction workpiece during the circulation of the oil circuit, and the nano-copper powder has better high-temperature chemical stability with respect to the organic additive, and therefore, fundamentally It solves the problem of agglomeration and carbonization which may occur in lubricating oil at high temperatures. More importantly, the nano copper powder is fine and soft, and can be filled with friction defects at any time to play a self-repairing effect. The function of nano copper lubricant additive is mainly reflected in:
1. Reduce frictional resistance, improve engine effective power and extend engine life;
2. Eliminate damage to the engine from initial start-up and save fuel consumption;
3. Improve the efficiency of the lubricating oil and ensure the power output of the engine.
Technical indicators
Experimental studies have shown that the addition of 0.1% nano-copper powder lubricant additive to the lubricating oil can reduce the friction coefficient by 30%, the wear by 34%, the fuel economy by 5%, and the average fuel consumption by 3%.

Nano boron nitride powder:
Nano boron nitride powder has excellent lubricating properties at room temperature and good lubricity in high temperature environments. It is widely used in the field of high temperature solid lubricants.

Nano Graphite powder:
Nano graphite powder belongs to layered inorganic substances, and the addition of nano-graphite lubricating oil and grease has obvious improvement in lubrication performance, high-temperature resistance, wear resistance and wear-reducing performance.
Lubricating oil and grease are used in the industrial lubrication field. However, lubricating oil and grease will reduce the lubricating effect in high temperature and high pressure environment, and nano graphite powder will be added as lubricant additive to lubricating oil and grease production. Among them, nano-graphite powder can upgrade its lubricating performance and high temperature resistance. Nano-graphite powder is made of natural flake graphite powder with good lubricity as raw material, while nano-graphite powder has nanometer-scale grain size and volume effect. , quantum effect, surface and interface effects, after research, it shows that under the same conditions of scale crystal size, the smaller the particle size of graphite powder, the better the lubrication effect.
The use of nano-graphite powder in grease is better than that in lubricating oil. Nano-graphite powder can be made into nano-graphite solid lubricating dry film, which can be used on the rolling surface of heavy-duty bearings. The coating formed by nano-graphite powder can be effective. The ground is isolated from corrosive media while providing effective lubrication.

Nano Zirconium Dioxide(ZrO2) particle:
The zirconia particles having a particle diameter of less than 100 nm can effectively improve the antiwear and antifriction properties and load carrying capacity of the lubricating oil. The tribological mechanism of nano-zirconia is deposited on the friction surface to form a lubricating film with anti-wear and anti-friction effects. It should be noted that the amount of nano zirconia added has an optimum value, and the amount of addition is too large, and the tribological properties of the lubricating oil may decrease.

Nano Silica(SiO2) particle:
The surface of the nano-silica particles contains a large amount of hydroxyl groups and unsaturated residual bonds, which can form a strong chemical adsorption film on the surface of the friction pair, thereby protecting the metal friction surface and significantly improving the friction performance of the lubricating oil.
Some studies have found that the bearing capacity of lubricating oil is greatly improved after adding nano-SiO2. When the amount of addition is 1.5, the PB value is increased by nearly one time. At the same time, it was also found that SiO2 nanoparticles as excellent lubricant additives showed excellent anti-wear and anti-friction properties, and played a certain role in repairing the wear table.