Showing papers on "Nickel boride published in 1988"
TL;DR: Le borure de nickel est prepare par addition de NaBH 4 a l'hexahydrate de chlorure de Nickel (II) as discussed by the authors, which is an addition of NaBh 4 + NaH 4 to the NaH 2 -hexahdrate of nickel.
Abstract: Le borure de nickel est prepare par addition de NaBH 4 a l'hexahydrate de chlorure de nickel (II)
45 citations
TL;DR: Aromatic nitro, azoxy, azo and hydrazo compounds were reduced with the sodium borohydride-nickel boride system under mild conditions as mentioned in this paper.
Abstract: Aromatic nitro, azoxy, azo and hydrazo compounds were reduced with the sodium borohydride-nickel boride system to the corresponding reduction products under mild conditions.
31 citations
Patent•
29 Feb 1988TL;DR: In this article, a sintering aid for powder metallurgical method for manufacturing an iron alloy article by compacting a predominantly iron powder mixture comprising carbon powder and a boron-containing additive, such as nickel boride, is described.
Abstract: A sintering aid is disclosed for use in a powder metallurgical method for manufacturing an iron alloy article by compacting and sintering a predominantly iron powder mixture comprising carbon powder and a boron-containing additive, such as nickel boride. The sintering aid comprises an oxygen getter to inhibit boron oxidation that, if formed, is believed to retard carbon diffusion. The sintering aid also preferably includes a second constituent to produce, in combination with the getter, a melting point suitable for forming a transient liquid phase during the early stages of sintering. Preferred sintering aids include intermetallic iron titanium compounds, intermetallic ferro-vanadium compound and intermetallic nickel magnesium compound.
6 citations
TL;DR: The least resistant phases in the alloy coatings are Ni and Ni3B and the most resistant CrB and Cr7C3 PN-KhN80S3R3 alloy possesses the highest corrosion resistance in 3% NaCl Additional alloying of the alloy with boron somewhat reduces the resistance of the coating as the result of the increase in the nickel boride content as mentioned in this paper.
Abstract: Laser-fused coatings possess the highest corrosion resistance, which is the result of texturing of the nickel and the formation of finely differentiated eutectics creating a branched structure of the more resistant phases The least-resistant phases in the alloy coatings are Ni and Ni3B and the most resistant CrB and Cr7C3 PN-KhN80S3R3 alloy possesses the highest corrosion resistance in 3% NaCl Additional alloying of the alloy with boron somewhat reduces the resistance of the coating as the result of the increase in the nickel boride content
1 citations
TL;DR: In this paper, spherical nickel boride Ni 3 B particles are observed within the grains of the α-Ni solid solution, and the microstructures of eutectic Ni-Ni 3 B alloys exhibit a metastable partial system.
Abstract: During the sintering process of boron nitride-nickel materials, chemical reactions between the components take place. The liquid phase in the sintered system is the product of these interactions. As a result of solidification of the liquid phase boron nitride, Ni 3 B is produced in the sintered material. The microstructures of eutectic Ni-Ni 3 B alloys exhibit a metastable partial system within the stable Ni-Ni 3 B system. Spherical nickel boride Ni 3 B particles are observed within the grains of the α-Ni solid solution.
1 citations
Patent•
02 Sep 1988
TL;DR: In this article, the authors proposed to suppress formation of high-boiling byproducts and obtain a compound useful as a raw material for polyurethanes or carbamate based agricultural chemicals in good yield at a low cost, by subjecting carbamic acid esters to thermal decomposition reaction in the presence of a catalyst of simple substance boron and/or a compound containing Boron.
Abstract: PURPOSE:To suppress formation of high-boiling by-products and obtain a compound useful as a raw material for polyurethanes or carbamate based agricultural chemicals in good yield at a low cost, by subjecting carbamic acid esters to thermal decomposition reaction in the presence of a catalyst of simple substance boron and/or a compound containing boron. CONSTITUTION:Carbamic acid esters are subjected to thermal decomposition reaction in the presence of a catalyst in a solvent (e.g. bromonaphthalene or n-hexadecane) inert to isocyanates at 100-350 deg.C for several min - several tens of hr to afford the aimed substance. Simple substance boron or at least one compound, selected from the following group and containing boron or both are used as the catalyst. (a) alkali metal or alkaline earth metal borates, (b) alkaline earth metal borides, (c) titanium family metal borides, (d) chromium family metal borides, (e) manganese boride, iron boride, cobalt boride and nickel boride, (f) boric acid esters and (g) boron carbide, boron silicide, boron nitride and boron oxide.
TL;DR: It has been shown that a combination of chlorotrimethylsilane and nickel boride effects the chemoselective reduction of an aldehyde in presence of a ketonic carbonyl group as discussed by the authors.
Abstract: It has been shown that a combination of chlorotrimethylsilane and nickel boride effects the chemoselective reduction of an aldehyde in presence of a ketonic carbonyl group.
TL;DR: In this paper, spherical nickel boride Ni 3 B particles are observed within the grains of the α-Ni solid solution, and the microstructures of eutectic Ni-Ni 3 B alloys exhibit a metastable partial system.
Abstract: During the sintering process of boron nitride-nickel materials, chemical reactions between the components take place. The liquid phase in the sintered system is the product of these interactions. As a result of solidification of the liquid phase boron nitride, Ni 3 B is produced in the sintered material. The microstructures of eutectic Ni-Ni 3 B alloys exhibit a metastable partial system within the stable Ni-Ni 3 B system. Spherical nickel boride Ni 3 B particles are observed within the grains of the α-Ni solid solution.