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

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The thermal decomposition behavior of these copper compounds was examined by means of a differential thermal balance analysis in which copper hydroxide, basic copper carbonate, anhydrous copper formate and a product of the subsequent decomposition reaction of copper formate, each weighing 10 mg, in an N 2 or H 2 gas atmosphere with a heating rate of 3 ° C / min. were heated. The results obtained on the peak temperatures in the calorimetric changes (endothermic, exothermic or the like changes) and the decomposition products are shown in Table 1.

P/M bronze filters are used to filter gases, oils, refrigerants and chemical solutions. They have been used in fluid systems of space vehicles to remove particles as small as one micron. Bronze diaphragms can be used to separate air from liquids or mixtures of liquids that are not emulsified. Only liquids capable of wetting the pore surface can pass through the porous metal part. In the above process, the starting compounds may remain unreacted depending on the reaction conditions, by-products may be formed in addition to the copper formate, or the copper formate may further react to form other compounds. In this way, the resulting copper formate contains such other compounds. For example, since copper formate is remarkably unstable in aqueous solution, the greater the proportion of water and the higher the temperature, the more the formation of water-insoluble products such as basic copper formates is accelerated due to side reactions or subsequent decomposition reactions. Any unreacted starting compounds, such as copper carbonate, copper hydroxide and copper oxide, and the products of side reactions or decomposition reactions, such as basic copper formates, can be converted by reduction into metallic copper, without any substance included in the copper being supplied. However, since the reduction reaction is accompanied by considerable heat generation and thereby water forms, such copper compounds are not suitable for the thermal solid phase decomposition in the method of the present invention, because the use of such compounds requires calorimetric control and other complicated procedures. Bronze filter materials can be used as flame arrestors on electrical equipment operating in flammable atmospheres where the high thermal conductivity of the bronze prevents ignition. They can also be used on vent pipes on tanks containing flammable liquids. Here again, heat is conducted away so rapidly that the ignition temperature is not reached.The copper powder produced by the above-described method of the present invention is generally a fine copper powder having an average primary particle diameter between 0,2 and 1 μm, a specific surface area between 5 and 0,5 m² / g, and a low tendency to agglomerate. The salient feature of the fine copper powder obtained by the thermal decomposition of anhydrous copper formate according to the present invention is that the powder has little tendency to agglomerate as compared with the copper powders prepared by the reduction method and other conventional methods Has.

Density can be controlled to produce parts with porosities as high as 60% or, conversely, those that are practically pore-free and have densities approaching the theoretical density of the metal. It is also possible to vary the density in a single part. And by producing parts with interconnected pores, the metallurgist can obtain a skeleton that can be impregnated with oils, plastics or even a metal having a lower melting point. Using Copper Powders The final sintered density has a significant effect on the conductivity of a P/M product. Conductivity is directly affected by porosity; the greater the void content, the lower the conductivity. Since the conductivity of a pore is zero, the relationship between porosity and conductivity is given by the equation: 2 K = K s(1-f) 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.

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Fine copper powders for use for the above purposes are prepared, for example, by reduction precipitation of a copper compound in the liquid phase, evaporation in a vacuum or in an inert gas, gas phase reduction of a copper salt, and solid phase reduction of an oxide. P.W. Taubenblat, W.E. Smith and C.E. Evans, "Production of P/M Parts from Copper Powder," Precision Metal 30(4):41 (1972). V. Morgan, "Applications of Porous Metal Bearings," Industrial Lubrication & Tribology 24(3):129-138 (1972).

The Registry of Toxic Effects of Chemical Substances (RTECS) contains reproductive data for this substance. Powder metallurgy, the technology of utilizing metal powders, offers the engineer a means conserving materials, reducing machining and securing a uniform product at a reasonable cost. This unique metal-forming method permits the production of parts with close tolerances and a minimum of scrap. It also enables the development of products that cannot be produced by any other method. By proper selection of powders, the powder metallurgy (P/M) specialist can control the density of products over a wide range and secure a wide range of mechanical and physical properties. He can produce mixtures of metals that are insoluble in each other or mixtures of metals and nonmetals that combine the properties of both. In a preferred washing treatment, water or an organic solvent such as an alcohol each containing an inhibitor or the like is used as a washing liquid in a single-stage washing or in the final stage of a multi-stage washing, and during washing, an ultrasonic dispersion treatment, a dispersion treatment with a Mixer or something similar done. This method is advantageous because it can achieve the reduction of impurity elements, a rust prevention treatment and the redispersion of agglomerated particles.

Using Copper Powders

The Registry of Toxic Effects of Chemical Substances (RTECS) contains acute toxicity data for components in this product. A method for producing a fine copper powder which includes solid phase thermal decomposition of an anhydrous copper formate in a non-oxidizing atmosphere at a temperature in the range between 150 and 300 ° C to obtain a fine copper powder having a primary particle diameter of 0,2 to 1 μm, a specific one Surface of 5 to 0,5 m² / g and having a low tendency to agglomerate, said anhydrous copper formate being an anhydrous copper formate powder having a particle diameter of 20 mesh or finer and 90 by weight or more within a temperature range between 160 and 200 ° C undergoes thermal decomposition when the anhydrous copper formate powder is heated in a nitrogen or hydrogen gas atmosphere at a heating rate of 3 ° C / min. and said anhydrous copper formate powder is obtained by dehydrating copper formate hydrate at a temperature of 130 ° C or less and then pulverizing the anhydrous copper formate, or by at least one copper compound selected from the group consisting of copper carbonate, copper hydroxide and copper oxide is reacted with formic acid or methyl formate. 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. R51/53: Toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment.

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. D.N. lisson, "A Metallurgical Review of Plain Bearings," paper presented at Coppermetal Bearings Symposium, Melbourne, Australia, Oct. 29, 1969. Add copper powder to castings resins such as polyurethane Fast-Cast resins, polyesters or epoxies for an authentic metallic copper appearance and feel. As apparent from the above description and as will be shown by the following Examples and Comparative Examples, the method of producing a fine copper powder by the thermal decomposition of anhydrous copper formate according to the present invention can provide a fine copper powder due to the use of the special anhydrous copper formate which has a small primary particle diameter and a low tendency to agglomerate. This particular anhydrous copper formate can be easily produced industrially at a low cost from a cheaper copper compound, and in this case, impurities contained in the starting material can be easily reduced.

There is no definite relation between the physical properties of the brake material and its performance as a friction material. Further, there are so many intangibles that influence friction and wear that the selection of a P/M friction material is still empirical.

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