14results about How to "Promote nucleation" patented technology

The invention discloses a low-dielectric low-loss high-strength borosilicate glass ceramic composite material and a preparation method thereof, and belongs to the technical field of borosilicate glass ceramic composites.The low-dielectric low-loss high-strength borosilicate glass ceramic composite material is prepared from, by weight, 70% of low-alkali borosilicate glass ceramics with the low borosilicate ratio, 29% of Al2O3 and 1% of Bi2O3. The preparation method comprises the following steps: preparing low-alkali borosilicate glass ceramics with a high borosilicate ratio, melting the low-alkali borosilicate glass ceramics with the high borosilicate ratio and amorphous SiO2 at a set temperature to obtain the required low-alkali borosilicate glass ceramics with the low borosilicate ratio, and finally mixing and ball-milling the crushed and ground low-alkali borosilicate glass ceramics with Al2O3 and Bi2O3 to obtain the low-alkali borosilicate glass ceramics with the low borosilicate ratio. And finally, the borosilicate glass ceramic composite material is sintered at the temperature of 880-900 DEG C. The borosilicate microcrystalline glass ceramic composite material is low in dielectric, low in loss and high in strength.

This invention discloses a method for controlling the in-situ precipitation of multi-scale strengthening phases in alloys and an alloy casting, belonging to the field of metal preparation technology. The method involves placing molten alloy in a crucible of a casting equipment, with a liquid cooling medium filling the area around and below a substrate. The molten alloy is ejected from the crucible outlet and impacts the substrate. Under the spreading and flowing action of the melt, and the cooling effect of the substrate and the liquid cooling medium, submicron-level precipitates are controlled, and a solidified alloy layer is formed. The substrate is then moved downwards towards the liquid cooling medium by a certain distance. This process is repeated, allowing the molten alloy to continuously accumulate and form on the solidified alloy layer. This ensures that the solidified alloy layer undergoes a certain temperature and number of thermal cycles before entering the liquid cooling medium, achieving the control of nanoscale strengthening phases and the formation of the alloy casting. This invention controls the solidification and solid-state phase transformation process of the alloy through a layering method. The process is short, the strengthening phase control effect is good, and high-quality, high-performance alloy castings can be obtained.

The application discloses a method for improving notch sensitivity of a GH2909 alloy forge piece and the GH2909 alloy forge piece, and comprises the following steps: S1, selecting a rod-shaped blank to be heated for the first time and kept warm; S2, heating the rod-shaped blank in S1 for the second time and keeping warm; S3, placing the rod-shaped blank in S2, which reaches the keeping-warm time, into a forging equipment to be forged into a shape; S4, rapidly cooling the forge piece obtained in S3; S5, performing surface defect treatment on the cooled forge piece; and S6, performing aging heat treatment on the forge piece after the surface defect treatment. The GH2909 forge piece produced by the method has no persistent notch sensitivity problem, and a forge piece with qualified structure and mechanical properties can be obtained.

This invention relates to the field of welding technology, specifically to a method for strengthening the heat-affected zone (HAZ) of thick low-carbon, low-alloy ship steel plates that withstand high heat input welding; more specifically, it relates to a method for strengthening the HAZ of thick low-carbon, low-alloy ship steel plates that withstand high heat input welding and its application. This invention uses a first flux as a printing material, which is melted onto the surface of a steel substrate via arc printing to obtain a steel billet. The first flux is mainly composed of CaF2, SiO2, MnO, and TiO2 in a mass ratio of 25–32:25–32:25–32:4–25. The steel billet is then rolled and welded. This method has advantages such as simple operation, low cost, short time consumption, and high production efficiency. Furthermore, the steel heat-affected zone prepared by this method has a large number of fine, dispersed inclusions and fine grains, greatly improving the mechanical properties of the heat-affected zone.

The invention provides a perovskite thin film and a preparation method and application thereof. The preparation method comprises the following steps: providing a perovskite precursor solution; coating the perovskite precursor solution on a substrate to form a perovskite wet film; carrying out annealing treatment on the perovskite wet film to obtain a perovskite thin film; in the annealing treatment process, auxiliary airflow and an auxiliary electric field are applied at the same time, the flowing direction of the auxiliary airflow is parallel to the plane where the perovskite wet film is located, and the direction of the auxiliary electric field is perpendicular to the plane where the perovskite wet film is located. By introducing a multi-physical field coupling environment formed by the auxiliary airflow and the auxiliary electric field, the dynamic effect of the airflow and the electrostatic guiding effect of the electric field are synchronously exerted in the annealing process, and the nucleation and growth processes of the perovskite thin film are collaboratively optimized; according to the coupling technology, the crystallization orientation degree and the grain orderliness of the perovskite film can be improved, disordered migration of ions is inhibited, the defect density of the film is reduced, and the uniformity and the stability of the perovskite film are improved.

The invention relates to the field of electro-catalysis, and discloses an electro-catalyst which has a mastoid nearly-spherical morphology, and the mastoid nearly-spherical morphology is composed of an aggregate which is formed by aggregating cuprous oxide particles with a primary particle size and has a secondary particle size. The electrocatalyst has the characteristic of simple preparation process, and has good multi-carbon product selectivity and stability in electrocatalytic carbon dioxide reduction.

The invention belongs to the technical field of preparation of polymer semiconductor materials, and particularly discloses a method for preparing a polyheptylimide photocatalyst by using organic and inorganic mixed molten salt, which comprises the following steps of: mixing high-nitrogen small organic molecules serving as a raw material with organic molten salt and inorganic molten salt in a vacuum glove box to prepare a precursor; and then carrying out high-temperature solid-phase polymerization in an inert atmosphere, washing and drying to obtain the target polyheptazinyl imide catalyst. The organic-inorganic mixed molten salt system is adopted to replace traditional pure inorganic molten salt, directional synthesis of polyheptylimide is promoted through mixed molten salt microenvironment regulation and control, the carrier transport resistance is effectively reduced, and photo-induced electron-hole recombination is inhibited. The prepared polyheptylimide has excellent photocatalytic oxidation performance, can realize H2O2 preparation through O2 activation and organic dye mineralization under visible light driving, has the advantages of simple process, low cost and good stability, is convenient for large-scale production and practical application, and has important value in the fields of energy conversion and environmental governance.

The invention discloses high-weldability aluminum-silicon coating steel containing residual element Cu for electric furnace steelmaking and a preparation method of the high-weldability aluminum-silicon coating steel, and belongs to the technical field of metal materials. Based on the innovative thought of copper alloying, the residual element Cu in waste steel is refined, the content of alloying elements Cu in the aluminum-silicon coating steel and the component content of As, Sn, Sb and Bi are precisely regulated and controlled, and the high-weldability aluminum-silicon coating steel containing the residual element Cu is obtained; the invention aims to develop the high-weldability aluminum-silicon coating steel. At present, in the prior art, a certain content of ferrite exists in the microstructure of an aluminum-silicon coating steel welding joint prepared without removing a coating, however, according to the invention, steel components are innovatively designed, and after a residual element Cu is added, the aluminum-silicon coating steel welding joint is subjected to full martensization, so that the mechanical property of the aluminum-silicon coating steel welding joint is remarkably improved. The method disclosed by the invention inherits the concept of sustainable development, realizes recycling of waste steel, and has important significance on development of novel aluminum-silicon coating steel and popularization and application of the novel aluminum-silicon coating steel in the field of laser welding.

The invention discloses a preparation method and application of inlaid highly isotropic coke, petroleum residual oil, petroleum asphalt, heavy oil or coal tar pitch are used as raw materials, a certain amount of graphene oxide or graphene is added, melt blending is carried out at a certain temperature, heat treatment is carried out at a certain atmosphere, pressure and temperature, and the inlaid highly isotropic coke is obtained. Isotropic semicoke rich in the superfine mosaic structure is prepared, and the superfine mosaic type highly isotropic coke is obtained after the obtained isotropic semicoke with the superfine mosaic structure is calcined. The isotropic degree of the prepared coke is greatly improved, and the isotropic degree and various performance indexes of the isotropic graphite material prepared by taking the prepared isotropic coke as the raw material are greatly improved.

This invention discloses a process for manufacturing an impact-resistant and wear-resistant ultra-hard metal-based composite layer and a straightening roller, comprising an alloy groove coating layer one, an alloy groove coating layer two, and an alloy working layer; both alloy groove coating layer one and alloy groove coating layer two have sinusoidal structures, are staggered, and have at least one set of intersection nodes between them, and are located inside the alloy working layer. By introducing V and Nb into the original formulation and precisely adjusting the proportions of components such as Co, Ni, Cr, C, B, and Si to meet the requirements, the composite layer retains high hardness and good oxidation resistance, impact resistance, thermal shock resistance, and corrosion resistance at high temperatures, improving the spraying process performance of the alloy coating and increasing the deposition rate.

This invention discloses an anti-oxidation and wear-resistant composite coating for an alloy roller surface and its manufacturing process, comprising an alloy groove coating layer one, an alloy groove coating layer two, and an alloy working layer. Both alloy groove coating layer one and alloy groove coating layer two have sinusoidal structures, circumferentially staggered on the alloy roller surface. At least one set of intersection nodes is formed between adjacent alloy groove coating layers one and two, and anchoring nodes are provided at the intersection nodes. Alloy groove coating layers one and two are located inside the alloy working layer. This invention improves the interlayer bonding strength and reduces the thickness by improving the structure, materials, and process, while also enhancing impact resistance, thermal shock resistance, and corrosion resistance to a certain extent, and maintaining high hardness at high temperatures.

The invention relates to the technical field of steel and iron materials, in particular to high-toughness and high-corrosion-resistance steel for a photovoltaic support as well as a preparation method and application of the high-toughness and high-corrosion-resistance steel, and the high-toughness and high-corrosion-resistance steel comprises the following components in percentage by mass: 0.09%-0.15% of C, 0.55%-0.80% of Si, 0.8%-1.1% of Mn, 0.8%-1.2% of Cr, 0.03%-0.06% of Ti, 0.20%-0.60% of Al, 0.01%-0.03% of Nb, less than or equal to 0.006% of S, less than or equal to 0.035% of P and the balance of Fe and inevitable impurities. By adding Al, Ti, Cr and other elements, the strength and corrosion resistance of the steel are improved, finally, the yield strength of the steel is larger than or equal to 500 MPa, the tensile strength is larger than or equal to 600 MPa, the percentage elongation after fracture is larger than 20%, and the minimum corrosion rate is 0.05 g / m < 2 >. H (test standard GB / T10125-2021).

This invention belongs to the field of magnetic functional materials technology, specifically relating to an amorphous nanocrystalline ribbon and its preparation method. The amorphous nanocrystalline ribbon is composed of the following raw materials in the indicated mass percentages: Nb 5.6-6.5 wt%, Si 9.5-10.5 wt%, B 1-2 wt%, Cu 0.5-1 wt%, Co 0.1-0.2 wt%, Zr 0.05-0.1 wt%, rare earth elements 0.4-1.5 wt%, high-entropy oxide 0.5-1.0 wt%, with the balance being Fe. The high-entropy oxide is prepared by adding ferric chloride, cobalt chloride, nickel chloride, manganese chloride, and scandium chloride to diethylene glycol, heating and stirring under sealed conditions, followed by centrifugation, washing, drying, and calcination to obtain the high-entropy oxide. The amorphous nanocrystalline ribbon prepared by this invention exhibits high magnetic permeability, low coercivity, and high stability within the temperature range of -40℃ to +150℃.

This invention relates to the field of architectural ceramics technology, disclosing a titanium sphene crystal frit, its preparation method, and its application. The raw materials include kaolin, titanium dioxide, quartz, potassium feldspar, calcite, and wollastonite. By pre-firing the titanium sphene crystal frit using this formula, the titanium sphene crystals are pre-dissolved in the glass phase. During the subsequent glaze firing process at 1200℃, the titanium sphene crystals melt again and precipitate a second time, resulting in an opaque glaze layer. This secondary crystallization enhances the chemical stability of the titanium sphene crystal frit during subsequent glaze firing, leading to a more stable increase in the solar reflectance of the fired glaze. This solves the problem of unstable reflectivity in glazes when directly using titanium sphene powder or combining it with titanium dioxide and titanium frit to directly form titanium sphene crystals during glaze firing.