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

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The worldwide annual demand for ultrafine copper powder is 12-15 tonnes. However, a much larger amount of copper is used as a financing object. How much copper powder has disappeared into bank vaults worldwide and will probably never come out again, can not be verified. 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.

Source: Standards Handbook, Part 2, Alloy Data. New York, Copper Development Association Inc., 1973. To 0,1 g of fine copper powder obtained above, 0,3 g of a surfactant (sorbitan fatty acid ester, "LEODOL", a product of Kao Corporation) and 150 g of water were added, and this mixture was subjected to ultrasonic dispersion treatment. Thereafter, the obtained dispersion was analyzed for agglomerate particle diameter by means of a laser type particle size distribution analyzer. As a result, it was found that the agglomerate particle diameter (on the average) was about 3 µm.Porous bronze bearings are used widely in automotive service, household appliances, automatic machines and industrial equipment in two types of applications: P.E. Matthews, "The Mechanical Properties of Brass and Developmental Nonferrous P/M Materials," Int. J. Powder Met. & Powder Technology 5(4):59 (1969). The powder thus obtained, which was the product of thermal decomposition, showed a brown color, had an oxygen content of about 3%, and consisted of uniform nearly spherical primary particles having an average particle diameter of about 0,3 μm. The agglomerate particle diameter of the powder was measured (on average) after the powder was dispersed in water by the treatment with a mixer, and found to be about 15 μm.

D.N. lisson, "A Metallurgical Review of Plain Bearings," paper presented at Coppermetal Bearings Symposium, Melbourne, Australia, Oct. 29, 1969. Under the above circumstances, the inventors have made intensive studies to develop a method for producing fine copper powder by simple procedures. As a result of their efforts, they have found a method defined in claim 1 for producing a copper powder having an average primary particle diameter of 0,2 to 1 μm, a specific surface area of ​​5 to 0,5 m² / g, and a low tendency to agglomerate. The present invention has been completed on the basis of the above. As an alternative to an oil bottle or ball bearing in medium to heavy duty applications. In these applications, facilities for relubrication must be supplied. 3 To 1,62 kg of copper hydroxide powder was added 4,8 kg of 80-percent aqueous formic acid solution, and this mixture was stirred for one hour. By filtration of the obtained mixture, copper formate tetrahydrate was obtained, which was then dehydrated at 100 ° C in vacuo to obtain anhydrous copper formate. The sintered yield strength increases from 11 ksi (26 MPa) at 7% aluminum to 40 ksi (276 MPa) at 11% aluminum; heat treatment of the latter alloy increases the yield strength to 60 ksi (414 MPa). Tensile strengths increase uniformly from 32 ksi (221 MPa) for the 7% alloy to 65 ksi (448 MPa) for the heat treated 11% alloy. Elongations of the 5% to 9% alloys are in the 25-35% range; the two phase alloys are considerably less ductile. 4 These properties make the P/M aluminum bronzes suitable for the production of parts where the strength requirements are too high to be met by the tin bronzes.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. Our Copper powders are mostly distributed by national or international distributors of metals and chemicals including ChemicalStore.com. P501 Dispose of contents/container in accordance with local/regional/national/international regulations. 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.