Abstract: The present disclosure provides a ZA4 alloy and a preparation method and use thereof, and relates to the technical field of pure zirconium materials. In the present disclosure, the ZA4 alloy includes the following components by mass fraction: 0.2% to 0.6% of Fe, 0.1% to 0.3% of O, 0.5% to 4% of Hf, and Zr as a balance. The Fe and O with a trace amount make a grain size of the ZA4 alloy significantly refined during smelting and cooling, and inhibit growth of a grains during thermal deformation and heat treatment. The Hf is a neutral element, and shows an obvious solid solution strengthening effect in an a phase. The ZA4 alloy obtained by strictly controlling a content of each element has higher strength and plasticity. The preparation method has simple operations and a low production cost, and is suitable for industrial production.

Abstract: The present disclosure provides a ZA4 alloy and a preparation method and use thereof, and relates to the technical field of pure zirconium materials. In the present disclosure, the ZA4 alloy includes the following components by mass fraction: 0.2% to 0.6% of Fe, 0.1% to 0.3% of O, 0.5% to 4% of Hf, and Zr as a balance. The Fe and O with a trace amount make a grain size of the ZA4 alloy significantly refined during smelting and cooling, and inhibit growth of a grains during thermal deformation and heat treatment. The Hf is a neutral element, and shows an obvious solid solution strengthening effect in an a phase. The ZA4 alloy obtained by strictly controlling a content of each element has higher strength and plasticity. The preparation method has simple operations and a low production cost, and is suitable for industrial production.

Abstract: A preparation method of a zirconium-titanium-based alloy embedded aluminized layer includes putting a zirconium-titanium-based alloy and an aluminiferous penetrant into a mould from bottom to top in a sequence of a first penetrant layer, a first zirconium-titanium-based alloy, a second penetrant layer, a second zirconium-titanium-based alloy and a third penetrant layer, and compacting to obtain a mixed sample; sequentially covering a surface of a mixed sample with activated carbon powder and alkali metal halide, and then carrying out heating and cooling treatments to obtain a zirconium-titanium-based alloy embedded aluminized layer. The preparation method does not need to adopt a special heating furnace or carry out heat treatment under a vacuum condition in an actual application, which simplifies operation process and condition and is suitable for large-scale production and application due to few technical difficulties and low equipment investment cost.

Abstract: The present invention provides a preparation method of a zirconium-titanium-based alloy embedded aluminized layer, and relates to the technical field of metal surface modification. The preparation method provided by the invention comprises the following steps: putting a zirconium-titanium-based alloy and an aluminiferous penetrant into a mould from bottom to top in the sequence of a first penetrant layer, a first zirconium-titanium-based alloy, a second penetrant layer, a second zirconium-titanium-based alloy and a third penetrant layer, and compacting to obtain a mixed sample; sequentially covering the surface of the mixed sample with activated carbon powder and alkali metal halide, and then sequentially carrying out heat treatment and cooling to obtain a zirconium-titanium-based alloy embedded aluminized layer.

Abstract: A catalyst for olefin polymerization and method of preparing the same are disclosed.

Abstract: A catalyst for olefin polymerization and method of preparing the same are disclosed.

Abstract: The catalyst for olefin polymerization contains three components A, B and C. The component A is a solid catalyst containing titanium, magnesium, chlorine element and an internal electron donor, the internal electron donor consists of 1,4-diether [2,2?-dialkoxy-1,1?-biphenyl, 2,2?-dialkoxy-1,1?-binaphthalene, 10,10?-dialkoxy-9,9-biphenanthrene]and organic acid ester or 1,3-diether [9,9-bis(methoxymethyl)fluorine, 2,2-dialky 1-1,3-dimethoxypropane]; the component B is an organoaluminum compound; the component C is external electron donor-organic silicon compound or the 1,4 aromatic diether. The catalyst has high catalytic activity, and can be adjusted in the range from 40,000 to 150,000 gPP/gCat when used in propylene polymerization. The polymer made therefrom has isotactivity of 80 to 99 percent and the molecular weight distribution can be adjusted in a wide range. The invention provides a novel method for preparing the 1,4 aromatic diether.

Abstract: The catalyst for olefin polymerization contains three components A, B and C. The component A is a solid catalyst containing titanium, magnesium, chlorine element and an internal electron donor, the internal electron donor consists of 1,4-diether [2,2?-dialkoxy-1,1?-biphenyl, 2,2?-dialkoxy-1,1?-binaphthalene, 10,10?-dialkoxy-9,9-biphenanthrene] and organic acid ester or 1,3-diether [9,9-bis(methoxymethyl)fluorine, 2,2-dialky 1-1,3-dimethoxypropane]; the component B is an organoaluminum compound; the component C is external electron donor-organic silicon compound or the 1,4 aromatic diether. The catalyst has high catalytic activity, and can be adjusted in the range from 40,000 to 150,000 gPP/gCat when used in propylene polymerization. The polymer made therefrom has isotactivity of 80 to 99 percent and the molecular weight distribution can be adjusted in a wide range. The invention provides a novel method for preparing the 1,4 aromatic diether.