19 results about "Iron group" patented technology

The invention provides an HMS-loaded copper-based composite catalyst, a preparation method thereof and an application of the HMS-loaded copper-based composite catalyst in preparation of epsilon-caprolactone, the catalyst comprises a composite oxide of Cu and an iron group element which are uniformly loaded by mesoporous silica (HMS), the molar ratio of the iron group element to Cu is (1.0 * 10 <-4 >-1.0 * 10 <-1 >): 1, and the loading amount of Cu on an HMS mesoporous material is 5-30 wt%. The preparation method comprises the following steps: dissolving nitrate of Cu and nitrate of iron group elements in ethanol to form a solution, then adding cetylamine, stirring and dissolving, adding a proper amount of water, then adding tetraethoxysilane, stirring at room temperature for 3-18 hours, and filtering, washing, drying and roasting the obtained product to obtain the catalyst. The catalyst disclosed by the invention has the advantages of high catalytic activity and good product selectivity in a reaction of catalyzing 1, 6-hexanediol to prepare epsilon-caprolactone through hydrogen dehydrogenation. The catalyst is simple in preparation process and easy for large-scale production.

An alloy for a hydrogen-resistant member to be used in a hydrogen-resistant member having resistance to hydrogen embrittlement comprises a fundamental component composed of one or more iron group elements, and a low-hydrogen-affinity component composed of one or more metal elements of a metal element group having a lower affinity for hydrogen than the iron group elements. The average value of the enthalpy of mixing with hydrogen, which is calculated based on the enthalpy of mixing with hydrogen and atomic ratio of each of all metal elements contained in the chemical composition of the alloy for a hydrogen-resistant member, is −20 [kJ / mol] or greater.

A rare-earth sintered magnet is provided, characterized in that it comprises R (R is one or more elements selected from rare earth elements, with Nd being essential), T (T is one or more elements selected from iron group elements, with Fe being essential), X (X is one or two elements selected from B and C, with B being essential), and M. 1 (M 1 The rare earth sintered magnet is selected from one or more of Al, Si, Cr, Mn, Cu, Zn, Ga, Ge, Mo, Sn, W, Pb, and Bi, with less than 0.1% O, less than 0.05% N, and less than 0.07% C, and has an average crystal grain size of less than 4.0 μm. Furthermore, when the orientation degree is set to Or [%] and the average crystal grain size is set to D [μm], it satisfies the relationship (1): 0.26×D+97≦Or≦0.26×D+99. Based on this rare earth sintered magnet, it is possible to obtain magnets with both high Br and high H content. cJ It has excellent magnetic properties.

A cemented carbide in a non-limiting embodiment of the present disclosure includes a hard phase including W and C, a binding phase including one or more kinds of iron group metals, and a condensed phase including Zr and Nb in which Nb / (Zr+Nb) in terms of atomic ratio is less than 0.38. A coated tool in a non-limiting embodiment of the present disclosure includes the cemented carbide and a coating layer located on a surface of the cemented carbide. A cutting tool in a non-limiting embodiment of the present disclosure includes a holder that extends from a first end toward a second end and includes a pocket on a side of the first end, and the coated tool located in the pocket.

This hard member has a base body including a hard phase and a binder phase. The hard phase contains tungsten carbide and nitrogen. The binder phase contains: at least one iron group element selected from the group consisting of iron, cobalt, and nickel; and nitrogen. The base body has an outer portion ranging between the surface and 1 mm therefrom, and an inner portion positioned further inside than the outer portion in the depth direction from the surface. When NOH [atm%] represents the content ratio of nitrogen in the hard phase in the outer portion, NOB [atm%] represents the content ratio of nitrogen in the binder phase in the outer portion, NIH [atm%] represents the content ratio of nitrogen in the hard phase in the inner portion, and NIB [atm%] represents the content ratio of nitrogen in the binder phase in the inner portion, the difference between NOB and NOH is smaller than the difference between NIB and NIH.

The present invention provides a rare earth sintered magnet which contains R (R represents one or more rare earth elements essentially including Nd), T (T represents one or more iron group elements essentially including Fe), B, M1 (M1 represents one or more elements selected from among Al, Si, Cr, Mn, Cu, Zn, Ga, Ge, Mo, Sn, W, Pb and Bi) and M2 (M2 represents one or more elements selected from among Ti, V, Zr, Nb, Hf and Ta), while comprising an R2T14B phase as the main phase. This rare earth sintered magnet is characterized in that: the M1 is in an amount of from 0.5% by atom to 2% by atom; if (R), (T), (M2) and (B) are the respective atomic percentages of the above-described R, T, M2 and B, the relational expression (1) ((T) / 14)+(M2)≤(B)≤((R) / 2)+((M2) / 2) is satisfied; and from 0.1% by volume to 10% by volume of all grain boundary phases in the magnet is composed of an R6T13M1 phase. This rare earth sintered magnet is able to achieve excellent magnetic characteristics including a good balance between high Br and high HcJ.

This hard material member comprises a base body including a hard phase and a binder phase. The hard phase contains tungsten carbide and nitrogen. The binder phase contains nitrogen and at least one iron group element selected from the group consisting of iron, cobalt, and nickel. The base body has an outside portion in a range up to 1 mm from the surface, and an inside portion positioned inside the outside portion in the depth direction from the surface. The hard phase contains a plurality of hard phase particles. The plurality of hard phase particles include: a plurality of first particles having crystal defects spreading in a mesh-like pattern, wherein the area ratio of the region in which the crystal defects spread in a cross section is 50 (%) or more; and a plurality of second particles having crystal defects, wherein the area ratio of the region in which the crystal defects spread in a cross section is less than 50 (%). The number of the first particles per unit area in the outside portion is greater than the number of the first particles per unit area in the inside portion.

This composite material has a first structure or a second structure including a carbon material, particles containing iron group elements, and compounds containing alkali metal elements (alkali metal and / or alkaline earth metal). In the first structure, a large number of particles containing iron group elements and compounds containing alkali metal elements are dispersed in the carbon skeleton of the carbon material, the particles containing iron group elements contain iron group metal particles having a passivated particle surface, and the compounds containing alkali metal elements are present at least as oxides containing alkali metal elements and / or carbonates containing alkali metal elements. In the second structure, a large number of particles containing iron group elements are dispersed in the carbon skeleton of the carbon material, a large number of compounds containing alkali metal elements are collectively present on the surface of the particles containing iron group elements, the particles containing iron group elements contain iron group metal particles, and the compounds containing alkali metal elements are present at least as oxides containing alkali metal elements.

In view of the foregoing considerations, new grade powders and associated cemented carbide compositions are needed that balance both performance and economic priorities. In one aspect, a powder composition described herein comprises particles of a solid solution carbide comprising lanthanum (La) and yttrium (Y), metallic binder phase comprising at least one metal for the iron group, and a balance of tungsten carbide particles.

RTB-based sintered magnet comprising an RTB-based mixture as main phase grains, wherein R represents at least one rare earth element, T represents one or more elements from the iron group, including Fe or the combination of Fe and Co, the RT-β-based sintered magnet comprises 0.75 wt% to 0.84 wt% B, 0.1 wt% to 0.3 wt% C, 0.01 wt% to 0.2 wt% N, and a concentrated R-Ga-C region is present in the grain boundary formed between or below two or more adjacent main phase grains, and the concentrations of R, Ga and C in the concentrated R-Ga-C region are higher than those in the corresponding main phase grains.

The invention relates to the technical field of fuel cells and electrolyzed water, in particular to a high-entropy alloy atomic layer catalyst, a preparation method and application. The catalyst has a PGM (at) IGM-PGM-HEA core-shell nanocube structure, the core is a platinum group metal, the shell layer is a pentabasic alloy formed by 2-3 iron group metals and 2-3 platinum group metals, and the atomic ratio is (1-3): 1. The preparation method comprises two steps of seed preparation and IGM-PGM-HEA atomic layer growth. The catalyst is coated on an electrode substrate such as a carbon base, a metal or a metal oxide to prepare an electrode, the electrode is used for a hydrogen evolution reaction and a hydroxide reaction, in the hydrogen evolution reaction, a 0.5 mol / L sulfuric acid solution test shows that the activity is reduced by not more than 10% after 15000 times of circulation; in a hydroxide reaction, the intrinsic activity is reduced by not more than 20% after 3000 times of circulation in a 0.1 mol / L KOH solution test. Compared with a commercial Pt / C catalyst, the catalyst provided by the invention has high catalytic activity and good stability, can effectively reduce reaction activation energy, and has important application value.

This hard member has a base material that includes a hard phase and a binder phase. The hard phase contains tungsten carbide and nitrogen. The binder phase contains nitrogen and at least one iron group element that is selected from the group consisting of iron, cobalt, and nickel. The base material has an outer part that ranges from the surface to a depth of 1 mm, and an inner part that is located on a side further inward from the surface than the outer part in the thickness direction. When NOH (atm%) is the content ratio of nitrogen in the hard phase in the outer part and NIH (atm%) is the content ratio of nitrogen in the hard phase in the inner part, NOH is higher than NIH.

The application belongs to the technical field of urea oxidation catalysts, and specifically discloses a composite nanofiber web structure material, a preparation method and application thereof. 0.2 Mo 0.8 N, Ni3Mo3N; the metal is an iron group metal, and the iron group metal is nickel. The composite nanofiber web structure material and the preparation method and application thereof have high conductivity and high specific surface area, and are a urea oxidation catalyst with application prospects.

The present application relates to the technical field of fuel cells and water electrolysis, in particular to a high-entropy alloy atomic layer catalyst, a preparation method and application. The catalyst has a PGM@IGM-PGM-HEA core-shell nanocube structure, the core is a platinum group metal, the shell layer is a quinary alloy formed by 2-3 iron group metals and 2-3 platinum group metals, and the atomic ratio is 1-3:1. The preparation method includes two steps of seed preparation and IGM-PGM-HEA atomic layer growth. The catalyst is coated on a carbon-based, metal or metal oxide electrode substrate to form an electrode, which is used for hydrogen evolution reaction and hydrogen oxidation reaction. In the hydrogen evolution reaction, the activity does not decrease by more than 10% after 15000 cycles in a 0.5 mol / L sulfuric acid solution test; in the hydrogen oxidation reaction, the intrinsic activity does not decrease by more than 20% after 3000 cycles in a 0.1 mol / L KOH solution test. Compared with a commercial Pt / C catalyst, the catalyst has high catalytic activity, good stability, can effectively reduce the reaction activation energy, and has important application value.

The invention relates to the field of iron group metal refining, and particularly discloses an initial electrolyte and method for preparing high-purity iron through sacrificial anode electrolytic refining, quaternary ammonium salt is adopted for regulating and controlling the solvation structure of the electrolyte, so that hydrogen evolution in the iron electrolytic refining process is remarkably inhibited, the pH tolerance range of the electrolyte is widened, and the high-purity iron is prepared. In the electrolytic refining process, acid does not need to be added into the electrolytic bath for pH regulation, and precipitation of a blocked diaphragm is avoided. Based on the advantages, according to the method for preparing the high-purity iron through electrolytic refining, the anolyte can enter the cathode tank only through simple precipitation, extraction and pH regulation, the electrolyte in the cathode tank can directly enter the anode tank, and the process is simple and easy to operate. The method is low in cost, the electrolyte can be recycled, and the method is a green and environment-friendly high-purity iron preparation method.

A non-limited cemented carbide of the present invention is a cemented carbide containing W, C and an iron group metal. The ratio of the average Vickers hardness at 1073 K to the average Vickers hardness at 303 K is 0.4 or more.

To provide a method for recovering rare earth elements by which the rare earth elements can be recovered at a low cost by reducing the cost without increasing the environmental load.SOLUTION: Performing a treatment (heat treatment) of applying activation energy to a rare earth element-containing composition containing a rare earth element, an iron group element, and oxygen under an inert gas atmosphere or a vacuum atmosphere; A mixture containing oxides of rare earth elements and metals of iron group elements is obtained (S10), the mixture is separated into the metals of the iron group elements and the remainder excluding the metals of the iron group elements by pulverization and separation (S11), the oxides of the rare earth elements are recovered by purification of the remainder excluding the metals of the iron group elements after the separation, and the rare earth elements are recovered from the oxides of the rare earth elements (S12).SELECTED DRAWING: Figure 1

A coated tool in a non-limiting embodiment of the present disclosure includes a base and a coating layer located on a surface of the base. The base includes a hard phase including W and C, a solid solution phase including W, C, and Ti, and a binding phase including an iron group metal. A residual stress of the hard phase in the base is “a,” and the “a” is in a range of −2.5 to −0.2 GPa. A residual stress of the hard phase in the surface of the base is “b,” and the “b” is in a range of −2.0 to 0.0 GPa.

Provided is a rare earth sintered magnet comprising R (R is one or more rare earth elements, Nd being essential), T (T is one or more iron group elements, Fe being essential), B, M 1 (M 1 is one or more elements selected from Al, Si, Cr, Mn, Cu, Zn, Ga, Ge, Mo, Sn, W, Pb, and Bi) and M 2 (M 2 is one or more elements selected from Ti, V, Zr, Nb, Hf, and Ta), with R2T 14 The rare earth sintered magnet with B phase as the main phase is characterized in that the M 1 0.5 to 2 atomic %, when the R, T, M 2 The atomic percentages of R, T, and M are [R], [T], [M ... 2 ], [B], the relationship (1) is satisfied: ([T] / 14)+[M 2 ]≤[B]≤([R] / 2)+([M 2 ] / 2), and 0.1 to 10 volume % of all grain boundary phases in the magnet are R6T 13 M 1 According to this rare earth sintered magnet, it is possible to obtain a rare earth sintered magnet having both high Br and high H cJ Excellent magnetic properties.