Copper Powder (Atomized Metal) - Weight: 1kg - By Inoxia

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R51/53: Toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment. The following description from the patent register gives an insight into the complex procedure. The patent described here is registered with Mitsubishi Gas Chemical Co. Inc. Tokyo, Japan. An alternative production is filtration and separation by means of a centrifuge. However, this is even more complicated and cost-intensive than the methodology described here. The anhydrous copper formate used in the present invention is generally copper (II) formate. The anhydrous copper formate is an anhydrous copper formate powder satisfying the thermal decomposition requirement that, when the powder is contained in an amount of 10 mg in a nitrogen or hydrogen gas atmosphere at a heating rate of 3 ° C / min. is heated, 90 weight percent or more of the powder within a temperature range of 160 to 200 ° C are thermally decomposed. This thermal decomposition behavior is preferable from the viewpoint of obtaining a fine copper powder which has higher purity and less tendency to agglomerate. In view of obtaining a copper powder having a smaller agglomerate particle size, the anhydrous copper formate powder has a particle size of 850 μm (20 mesh) or finer, and especially a powder having a particle size of 150 μm (100 mesh or finer). Such an anhydrous copper formate powder can be obtained by dehydrating copper formate hydrate at a temperature of 130 ° C or less, and then pulverizing the dehydrated copper formate by forming crystals of anhydrous copper formate directly from an aqueous solution of copper formate and then pulverizing the crystals, or by directly forming a crystalline anhydrous copper formate powder having a particle size of 850 μm (20 mesh) or finer from an aqueous solution of copper formate. It is preferable that the anhydrous copper formate powder thus obtained has a low content of impurity elements, especially alkali metals such as Na or K, sulfur and halogens such as Cl, for the purpose of producing a fine copper powder having a reduced impurity content. Anhydrous copper formate produced by any of a variety of methods can be used in the present invention as far as the copper formate to be used satisfies the above requirements. However, anhydrous copper formate prepared by a method using copper carbonate, copper hydroxide or copper oxide as the starting copper compound and reacting this starting copper compound with formic acid or methyl formate is useful as a starting material for the process of the present invention when the process is industrial is performed.

Source: A. Price and J. Oakley, "Factors in the Production of 90/10 Tin Bronze Compacts of Higher Density (7.49g/cm 3)," Powder Met. 8:201 (1965). As compared with the copper powders obtained by the reduction method and the like, the fine copper powder produced by the method of the present invention is more slowly oxidized in the air. Therefore, even if the fine copper powder according to the present invention is left in the air, no color change caused by oxidation takes place unless the duration of exposure is short. Since the produced fine copper powder contains impurity elements which were originally contained in the anhydrous copper formate powder which was expected to be present, and most of which adhere to the surface of the powder particles, it is preferred that the fine copper powder be mixed with water, an organic solvent or an organic solvent Solution of a rust inhibitor for copper in water or in an organic solvent is washed to reduce the impurity elements, such as halogens, sulfur, alkali metals and heavy metals. By such a washing treatment, for example, 90% or more of the alkali metals and halogens present as impurity elements may be removed, though depending on the amount of these impurity elements.Metals such as copper and lead which have very limited solubilities in each other are difficult to alloy by conventional means but copper-lead powder mixtures have excellent cold pressing properties. They can be compacted at pressures as low as 11 ksi (76 MPa) to densities as high as 80% and, after sintering, can be repressed at pressures as low as 22 ksi (152 MPa) to produce essentially nonporous bearings. This product is subject to the reporting requirements of section 313 of the Emergency Planning and Community Right to Know Act of 1986 and 40CFR372. In addition, with the exception of anhydrous copper formate, all copper compounds must be heated in a reducing atmosphere (H 2 gas) to form metallic copper powder, and their reactions in the reducing atmosphere are exothermic, their exothermic amounts of heat at least five times greater than that of anhydrous copper formate are.

In one method of producing coins, medals and medallions, a mixture of 75Cu-25Ni powders with zinc stearate lubricant is compressed, sintered coined and resintered to produce blanks suitable for striking. These blanks have the advantage over rolled blanks of being softer because they are produced from high purity material. Therefore, they can be coined at relatively low pressures and achieve greater relief depth with decreased die wear. Impurities in the anhydrous copper formate (ppm) impurities in the produced Cu powder (ppm) washing liquids and technology impurities in the washed Cu powder (ppm)To 0,66 kg of cupric oxide powder, 2,4 kg of 16-percent aqueous formic acid solution was added. The resulting mixture was heated to 80 ° C for three hours, and the water was then removed by evaporation at 100 ° C at reduced pressure to concentrate and dry the reaction product to give 1,2 kg of anhydrous copper formate crystals. The degree of thermal decomposition of this anhydrous copper formate was 85%. The crystals thus obtained were dissolved in water to determine the content of water-insoluble components, and the content was found to be 15%. The water-insoluble components were analyzed by X-ray diffractometry and found to have a composition corresponding to an approximately 1: 1 mixture of unreacted cupric oxide and basic copper formate. Self-lubricating porous bronze bearings depend on conduction and convection for heat dissipation during service. The frictional heat developed is proportional to PVµ where P is the pressure on the bearing, V is the surface velocity and µ is the coefficient of friction. Practical limits for safe operation of these bearings are often set at a PV factor of 50-60 ksi (345-414 MPa). These bearings are installed by pressing into rigid reamed or bored housings. Copper and copper alloy powders are also used in such nonstructural applications as brazing, cold soldering, and mechanical plating, as well as for medals and medallions, metal-plastic decorative products and a variety of chemical and medical purposes. Table of Contents: P501 Dispose of contents/container in accordance with local/regional/national/international regulations. Add copper powder to castings resins such as polyurethane Fast-Cast resins, polyesters or epoxies for an authentic metallic copper appearance and feel.