415results about How to "No oxidation" patented technology

The invention relates to high-temperature-resistant silver-coated and nickel-coated copper conductive powder of a core-shell structure and a preparation method thereof. The structure of silver-coated and nickel-coated copper particles has three layers, namely, the copper core layer, the nickel middle layer and the silver outmost layer. The preparation process includes the four steps of firstly, preprocessing copper powder; secondly, wrapping the surfaces of the copper particles by nickel; thirdly, wrapping the surfaces of the nickel-coated copper particles with silver; fourthly, processing the silver-coated and nickel-coated copper particles. The prepared silver-coated and nickel-coated copper conductive powder of the core-shell structure has excellent high-temperature-resistant oxidation performance and conductivity, can completely or partly replace silver powder, and is wide in application range.

Sulfur-resistant SPGM catalysts with significant oxidation capabilities are disclosed. Catalytic layers of SPGM samples may be prepared using incipient wetness and metallizing techniques to structure a washcoat layer of ZPGM material of YMnO3 perovskite , and an overcoat layer including Pt / Pd composition on alumina-silica support oxide. Loading of PGM in OC layer is less than 5 g / ft3. A testing methodology for samples may be enabled including of DOC light-off, and soaking under isothermal DOC and sulfated DOC conditions to assess synergistic influence of adding ZPGM to PGM catalyst samples. Resistance to sulfur and catalytic stability may be observed under 5.2 gS / L condition to assess significant improvements in NO oxidation, HC conversion, and CO selectivity. Resistance to sulfur of disclosed SPGM catalyst may be compared with performance of an equivalent PGM control catalyst for DOC applications.

An oxidation catalyst for treating an exhaust gas from a diesel engine, which oxidation catalyst comprises: a first washcoat region comprising a first platinum group metal (PGM), a first support material and a NOx storage component; a second washcoat region comprising platinum (Pt), manganese (Mn) and a second support material; and a substrate having an inlet end and an outlet end.

The invention discloses a process method for producing a balance weight for a compressor by powder metallurgy, which comprises the steps that: (1), raw materials comprising Mn (17-25%), C (0.5-1.5%) and Fe (the rest) are uniformly blended to produce raw material powder required by production; (2), the raw material powder is put into a mechanical press (or four-column hydraulic press) for compression moulding so as to obtain a pressing compact for the balance weight; (3), the pressing compact for the balance weight is put into a continuous mesh belt furnace (or push rod furnace) for sintering to obtain a sintering compact for the balance weight; and (4), the sintering compact for the balance weight is subjected to shot blasting treatment to obtain a finished product of the high manganese steel weight balance for the air compressor. According to the production method disclosed by the invention, the stability of the sizes of workpieces is good, no impurity is generated, the quality of the surface is excellent, and the components are uniform and stable; the weight variation among products of different batches is small and can be controlled within 1%; no oxidation is generated in the production process, the internal organization of metal is excellent, the crystalline grain is finer, and the bad organizations such as coarse crystal and mixed crystal can be avoided.

The invention provides a Li-ion positive electrode slurry and a preparation method thereof. The preparation method comprises the following steps of: mixing lithium iron phosphate and dry inorganic conductive agent powder, wherein uniform mixing is judged by randomly sampling and measuring the resistance value of the powder, and is considered to be achieved when the difference of the resistance value of each sample powder is less than 5%; then adding PVDF (Polyvinylidene Fluoride) colloidal fluid into the mixture step by step; finally regulating the viscosity of the slurry by utilizing 1-Methyl-2-pyrrolidinone, thereby obtaining the Li-ion positive electrode slurry. The viscosity of the Li-ion positive electrode slurry is 3000-5000cps, and the Li-ion positive electrode slurry comprises 1-methyl-2-pyrrolidinone, as well as lithium iron phosphate, polyvinylidene fluoride and the inorganic conductive agent which are at a mass ratio of (85-95):(3-8):(2-10). According to the preparation method, whether the inorganic conductive agent is uniformly dispersed in lithium iron phosphate is determined by a method of randomly sampling dry powder, mixing samples and measuring the resistance values, and meanwhile, the PVDF colloidal fluid is added step by step in a substep slurry preparation process, so that the conventional thought of firstly mixing solid materials and adding the colloidal fluid in one step in a slurry preparation process in the field is broken through, and a favorable slurry preparation effect is achieved.

The invention discloses a gas protecting system of a metal powder laser quick forming machine. The metal powder laser quick forming machine comprises a sealing forming bin, the gas protecting system comprises a gas circulating purifying mechanism, the gas circulating purifying mechanism comprises an explosive-proof and smoke dust-removal purifier, the explosive-proof and smoke dust-removal purifier is connected with the sealing forming bin through a gas inlet pipe and a gas outlet pipe to form the gas circulating purifying, and is sequentially provided with a water filtering device, a filtering element device, a circulating fan device and a drying machine from an inlet to an exit, and electric valve switches are respectively arranged on the gas inlet pipe and the air outlet pipe. The gas protecting system has the advantages that the oxygen content of the forming environment is controlled to be less than 100ppm, the smoke dust produced in the forming process can be filtered to balance the gas pressure of the forming bin, and the compactness of the formed part reaches 100%; the bright metal luster is realized, and the oxidizing is avoided; the consumption amount of inert gas is saved, the consumption amount of gas is only equal to 2 / 100 of the consumption amount of gas of the prior art, and the economic benefit is higher.