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. 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. 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. 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 While the invention has been described in detail and with reference to specific embodiments thereof, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the scope of the claims.

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.

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The method of producing a fine copper powder according to the present invention involves thermally solid-phase decomposing anhydrous copper formate in a non-oxidizing atmosphere at a temperature ranging between 150 and 300 ° C to obtain a fine copper powder having an average primary particle diameter of 0,2 to 1 μm , having a specific surface area of ​​5 to 015 m2 / g and a low tendency to agglomerate, wherein the anhydrous copper formate is a waterless copper formate powder having a particle size of 850 μm or less, and 20 weight percent or more thermal decomposition within a temperature range of 90 to 160 ° C when the anhydrous copper formate powder is heated in a nitrogen or hydrogen gas atmosphere at a heating rate of 200 ° C / min. is heated. The crystals of the anhydrous copper formate obtained above were pulverized into a powder having a particle size of 150 μm (100 mesh) or finer, and using 1 kg of the powder, except that the powder was kept at 300 ° C for one hour thermal decomposition in the same manner as in Example 1. In this way, 414 g of a powder which was the product of thermal decomposition was obtained. 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. The powder thus obtained, which was the product of thermal decomposition, showed a copper color and consisted of uniform nearly spherical primary particles having an average particle diameter of about 0,3 μm. However, the powder became brown within a relatively short time. In addition, 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 20 μm.

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. and stirring or ultrasonic treatment (indicated by *) was performed for ten minutes. In cases where a washing operation has been repeated, the number of repeated washing operations is shown in the table after 'x' (e.g. 'x9' means 'washed nine times').

Add copper powder to castings resins such as polyurethane Fast-Cast resins, polyesters or epoxies for an authentic metallic copper appearance and feel. Accordingly, it is an object of the present invention to provide a method for producing a fine copper powder as described above. All components of this product are listed in the U.S. Environmental Protection Agency Toxic Substances Control Act Chemical substance Inventory. A basic attribute of powder metallurgy is the ability to combine materials in powder form that are otherwise immiscible. This unique advantage allows the production of friction materials in which copper and other metal powders are combined with solid lubricants, oxides and other compounds. Metallic friction materials can be operated at higher loads and temperatures than organic friction materials.

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. The Registry of Toxic Effects of Chemical Substances (RTECS) contains tumorigenic and/or carcinogenic and/or neoplastic data for this substance. Such oxidisation or other adverse reactions are unlikely to occur with polyurethane or epoxy resins but it may still be a good idea to mix the resin and hardeners together before adding the metal powder. P.E. Matthews, "Cubraloy, A New Development in Aluminum Bronze Powder Metallurgy," Proc. Fall 1971 Powder Metallurgy Conference, Metal Powder Industries Federation.

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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. In the method of the present invention, an anhydrous copper formate powder as described above is thermally decomposed in the solid phase to produce a fine copper powder. 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.

The present invention will be explained in more detail with reference to the following examples and comparative examples, but the examples should not be construed as limiting the scope of the invention. In these examples, unless otherwise stated, all parts and percentages are based on weight. With the exceptions that 0,66 kg of cupric oxide powder and 2,4 kg of 80-percent formic acid solution were used as starting materials and that the starting materials were mixed and stirred at 80 ° C 20 for hours, anhydrous copper formate crystals in an amount of 1,28 kg in same way as in example 1. The degree of thermal decomposition of the thus obtained anhydrous copper formate was practically 100%.

kg of a 3 percent aqueous formic acid solution were added to 2 kg of basic copper carbonate (= CUCO 2 Cu (OH) 2,4 H 40 O). The resulting mixture was heated to 80 ° C and kept at that temperature for 30 minutes while the mixture was stirred. The water was then removed by evaporation at 80 ° C under reduced pressure to concentrate and dry the reaction product, whereby 1,28 kg of crystals of anhydrous copper formate were obtained. The thermal decomposition properties of this anhydrous copper formate were tested by adding 10 mg of the anhydrous copper formate in a nitrogen or hydrogen gas atmosphere at a heating rate of 3 ° C / min. were heated. As a result, it was found that the proportion of components which had decomposed in the temperature range of 160 to 200 ° C (hereinafter referred to as "thermal decomposition degree") was practically 100%. Very fine (325 mesh), highly pure irregular copper powder suitable for a range of applications including resin-casting, decorative coatings and powder metallurgy. Example Comparative example Particle size of the anhydrous copper formate (mesh) µm Conditions of thermal decomposition: - Temperature - Duration (hours) Produced Cu powder - Primary particle ∅ (µm) - Specific surface area (m² / g) - Agglomerate particles ∅ (µm)