The bronze powder is a floating flake pigment. With a certain proportion of copper, zinc and aluminum alloy in melt milling, it meets to required specifications. Bronze powder’s colors are: red and gold, green gold, green and red gold, bronze gold and so on.
More coarse the bronze powder is, the stronger the sense of metal will be. And it becomes more flashing and brightness. If it is finer, sense of metal reduced, the color is gentler and hiding function is better.
Copper powder under gentle stirring, scores of times to the copper powder in the solvent of 1:1 or 2:1. Under low shear stirring for about 15 minutes to a paste. Adding the required tone gold oil, stir to blend evenly. Solvent adjusted to the desired viscosity. To avoid curling and breaking the flaky copper powder particles in the dispersion process and reduce optical effects, the best choice of blade stirrer or disc scattered, medium-speed stir.
At the same time should avoid the use of nitrocellulose and epoxy resin. Two will be Si chemical reaction to generate the jelly; such as the use of these two resin, it should be as much as possible within a short time. Should be used wherever possible the low acid value of resin, the resin by the acid value as low as possible. Aromatic hydrocarbons and esters help to make the metal powder particles completely wetting to achieve fully dispersed. It should avoid the use of alcohol and ketone solvents and acidification incomplete lipid solvent. Be sure to use high purity resin and solvent (low water content), containing a small amount of water recommended using the molecular sieve to remove the moisture before the copper powder pigments.
Copper powder in the milling process will be added fatty acids, to reduce friction and protect the copper from the oxide, copper powder surface of both fatty acid protective layers. High temperature, water, sweat and alkaline media are very easy to damage the protective layer of copper powder surface, thereby enabling the slow oxidation, gradually lose their metallic luster.
Caused by copper powder gloss because the powder particle size distribution too broad, too large proportion of fine particulates (<3¼m), copper powder in the low and aligned bonding compound floating. Equal to the composition of bronze powder and import of copper powder has the same hue and saturation. The uneven distribution of powder particle size is in thick scales, the surface cover rate is smaller with low gloss.
The determination of the bronze powder’s correspondence between wettability and floating deepens the understanding of mechanism of copper powder’s floating. And it proposes a new method for improvements of bronze powder’s floating performance. It provides a new approach for surface treatment of bronze powder (FCu 663). After the use of FSA on the surface modification of bronze powder, bronze powder’s floating and printed brightness are greatly improved. It shortens the gap with imported powders. In the polishing process of bronze powder, bronze powder tablets were flattened polished and has the fragmentation phenomenon. It reduces the performance of surface cover rate’s changes according to the polishing time.
Source:http://www.mhcmp.com
The application of tungsten in various industries
Steel Industry Most of tungsten applied in the production of special steels. The widely used high-speed steel was containing 9-24% of tungsten, 3.8-4.6% of chromium, 1-5% of vanadium, 4-7% of cobalt, 0.7-1.5% of carbon.
Magic effects of coconut oil
According to records, coconut oil can be regarded as the nobility of skin care plant extracts. It was rich in exotic tension of tropical plants, which can enhance the contractile force of the pores, perfectly beautify and nourish the skin.
Exploring the Potentials of Nano-Aluminum Powder
Nano-aluminum powder, a material with remarkable properties due to its minuscule particle size, is revolutionizing various industries with its high reactivity and large specific surface area. Unlike its bulk counterpart, nano-aluminum powder begins to oxidize at a lower temperature of 550°C, compared to the 950°C oxidation point of ordinary aluminum. This lower ignition energy and full combustion without apparent cohesion make it a superior choice for applications requiring high energy and efficiency. The unique characteristics of nano-aluminum powder, such as faster burning rates and greater heat release, are largely influenced by its synthesis method, which determines its particle size, surface area, and shape.
