The article below has some excellent information if you're looking for conductive pure copper powder for electrooxidation resistance, dispersibility in binder resins, or electromagnetic shielding.
Dendritic copper powder is used in a number of industries, including EMI shielding, flexible circuit boards, welding, decorative applications, and anti-fouling paints. It has a lot of benefits, including high sinterability, good electrical conductivity, and high moldability. Additionally, it is a less expensive alternative to precious metal powders.
There are various processes that can be used to make it. Electrolysis is one such method that involves submerging the anode and cathode in a sulfuric acid-containing electrolytic solution. The solution is then subjected to direct current in order to precipitate copper onto the cathode.
The powder's dendritic shape gives the particles a lot of contact points, which can lead to high electric conductivity. Additionally, it gives the conductive layer of flexible printed circuit boards flexibility.
The apparent density of the powder is also influenced by its structure. The shape of the powder, the degree of oxidation, the density of the granules, and the porosity of the granules all affect the apparent density.
It's crucial to pick the appropriate materials for electromagnetic shielding. Electrical conductivity, magnetic permeability, and the capacity to match impedances must all be present in combination. There are numerous methods to achieve this objective. The conductivity of the material is typically the most significant factor in determining its electromagnetic shielding properties.
The best material for EMI shielding is copper. In addition to having excellent corrosion resistance, it is highly conductive. Copper is also simple to manufacture. The different shapes that copper alloys can take allow for a wide range of shielding applications.
EMI shielding can be accomplished using metals like copper powder, silver, nickel, beryllium, and platinum. The mechanical and electrical characteristics of metal alloys are extremely diverse. Copper and nickel are expensive metals with high electrical conductivity. Additionally useful for contact applications are copper alloys.
A significant obstacle in the creation of next-generation electrical transferring powders is finding a conductive copper powder that can transfer electricity effectively and efficiently. The key is to find a microstructure with the right amount of oxidation resistance in order to achieve this.
The chemical makeup of the metal has a major impact on how resistant to oxidation copper powder is. At higher temperatures, oxidation happens more quickly. The metal powder's surface structure is additionally vulnerable to the oxidation process. In this situation, crystalline flaws or dislocation sites frequently cause the metal to oxidize first. The metal powder is given a continuous Ag network in order to prevent preferential oxidation at GBs. Overall oxidation resistance rises as a result.
Cu can also be alloyed with other metals besides Ag to increase its resistance to oxidation. For instance, Cu alloyed with Ti can significantly increase the oxidation resistance. Similar to this, Cu alloyed with Mg can also significantly improve oxidation resistance.
An electrically conductive composite material is produced by adding more copper powder by volume to an unsaturated polyester resin. This material can be soldered easily and has excellent conductivity. This composition can be used to create thin film circuits.
Cu powder is sieved into fractional size groups to examine the impact of particle size on thermal conductivity. The powder's particle size distribution is then measured using a laser granulometer. There is a bimodal trend in the distribution. At 6 mm, the bimodal peak is centered. With a reduction in particle size, the peak's intensity rises. 75 mm is the typical particle size.
Unsaturated polyester resin was utilized as a binder in this study. Dendrite-shaped copper powder particles were added to the resin mixture. Silver is then applied to the powder to create a composite material that is electrically conductive. A dendritic-shaped particle with a large contact surface area makes up the copper filler.
In 2007, Changsha Tianjiu Metal Materials Co., Ltd., also known as TIJO, started researching "spherical metallic powder." The business was founded in the year 2010. This 15-year-old business has a strong technical foundation and years of experience in the R&D of metal products.
Our company's products of spherical metal powder are characterized by a precise control of composition, very low impurity, controlled particle size, fluidity, and excellent spherical shape. It is utilized in a variety of fields, including powder metalurgical.
Our business has an ISO 9001 quality system certification. All of our products like industrial metal powder adhere to ROHS regulations. Small batch sizes, large batch sizes, and multi-category product requirements are all things we can accommodate for customers.
There is always online technical support available, and it is possible to fly right to customers to solve their issues. We offer seven series, more than 30 stable and mature metal powder, as well as 300 custom metal powders that can be made to our customers' specifications for a variety of uses.
The copper powder that are conductive have many different sources now. These powders were chosen because of their excellent electrical and thermal conductivity. They are utilized in contacts and electrical components. Additionally, copper-graphite compositions have a high current-carrying capacity and excellent thermal conductivity.
Additionally, copper powders that resist oxidation can be created using additives or additional layers of defense. These powders can be used to create inexpensive flexible electronics by printing them on various substrates. They can also be utilized for RFID antennas and heating circuits. Their extensive industrial applications, however, have not yet been fully developed. Additionally, the preparation procedure is very difficult.
Porosity also has an impact on the effective thermal conductivity of copper powders. This effect has been researched at standard pressure and room temperature. In order to explain the variation in effective thermal conductivity, a two-phase system model was created.
EN 
CN
DE
ES
JA
KO
RU
AR
