53 results about "Paracrystalline" patented technology

The invention discloses a quasi-crystal strengthened cast magnesium-lithium alloy and a preparation method thereof, belonging to the technical field of cast alloys. The invention aims to solve the problem that the uniform distribution of quasicrystals cannot be controlled when the number of quasicrystal phases is increased in the existing quasicrystal strengthened cast magnesium-lithium alloy. The quasicrystalline strengthened cast magnesium-lithium alloy of the present invention contains 8%-15% Li, 5%-8% Zn, 0-15% Al, 0-5% Y, and 0-5% in mass percent Gd, the rest is Mg. When preparing the quasi-crystalline strengthened cast magnesium-lithium alloy, the quasi-crystalline phase is added to the alloy melt in batches in the form of hollow spheres. After the addition, the melt is kept at 720-740°C for 30 minutes, and the furnace temperature is adjusted to 680-700°C before pouring into a mold to form an alloy ingot. The invention achieves the purpose of increasing the quasi-crystal content and simultaneously improving its distribution uniformity, and the distribution uniformity of the as-cast quasi-crystal strengthening phase is increased by more than 80%.

The invention discloses a method for preparing a quasi-single-crystal perovskite film, comprising: step 1, preparing a small-grain perovskite ABX3 film with a grain size less than or equal to 300 nm on the surface of a substrate; step 2, comprising step 1 The prepared small-grain perovskite ABX3 film substrate is transferred to a closed device containing a saturated atmosphere of AX, heated to a temperature of 50-400°C and kept for 5-90min; Rapid growth occurs under the condition of the quasi-single crystal perovskite thin film. In the present invention, the prepared small-grain perovskite film is placed in a closed environment containing the saturated vapor pressure of AX, so that the perovskite film is dissolved and crystallized into a quasi-single crystal perovskite film in the saturated vapor of AX, greatly reducing the Defects are eliminated, and the defect density is reduced. Moreover, surface and grain boundary defects caused by organic cations or halide anions escaping from perovskite during the preparation of quasicrystalline perovskite are avoided.

The invention provides a double-linear track detecting method of a refraction effect of a two-dimensional photonic quasi-crystal wedge lens, which relates to a double-linear track detecting method. According to the invention, the double-linear track detecting method comprises the following steps of: arranging two linear tracks parallel to a bevel edge of the two-dimensional photonic quasi-crystal wedge lens; and according to opposite positions of the two tracks and the bevel edge as well as maximum strength positions detected on the two tracks, determining a refraction angle and effective index of a refracted beam as well as an emission position and emission position offset of the refracted beam through a geometrical relationship and a refraction law, so as to determine the refraction effect of the two-dimensional photonic quasi-crystal wedge lens. The double-linear track detecting method provided by the invention can be applied to any electromagnetic wave and any two-dimensional N-fold quasi-crystal wedge lens. The double-linear track detecting method provided by the invention is suitable for the field of photonic crystals, in particular photonic quasi-crystals. Meanwhile, according to the invention, a problem that the refraction angle and the effective index cannot be accurately detected or calculated by the traditional single circular arc track detecting method is also solved.

The invention discloses a method for preparing nano quasi-crystal reinforced Mg-Zn-Y alloy by means of equal channel angular pressing. The method includes the following steps that A, cast-state Mg-Zn-Y alloy is prepared according to the set atomic percentage composition ratio of all components and comprises 0.5%-6% of Zn, 0.08%-1.2% of Y and the balance Mg based on the set atomic percentage composition of all the components, and the atomic percentage composition specific value of the Zn to the Y is 5-7:1; B, the cast-state Mg-Zn-Y alloy is annealed for 8-20h at the temperature of 380-420 DEG C, and furnace cooling is conducted; C, the annealed Mg-Zn-Y alloy is subjected to hot extrusion after heat preservation lasts for 2-4h at the temperature of 300-400 DEG C, the extrusion temperature is300-400 DEG C, and the extrusion ratio is 9-60:1; D, the Mg-Zn-Y alloy processed through hot extrusion in the step C is put into a thermal treatment furnace, the furnace temperature rises to 540-600DEG C, heat preservation lasts for 5-20min, and quenching is performed; and E, the Mg-Zn-Y alloy obtained in the step D is subjected to equal channel angular pressing after heat preservation lasts for2-4h at the temperature of 180-330 DEG C, and accordingly the nano quasi-crystal reinforced Mg-Zn-Y alloy can be obtained. By adoption of the method, the high-performance magnesium alloy with good yield strength, tensile strength and ductility can be prepared.

The invention discloses a wok and a preparation method thereof, wherein the wok comprises: a wok body, the wok body is formed of an iron-based material, a quasicrystalline coating, the quasicrystalline coating is formed of a quasicrystalline material, and the A quasi-crystalline coating is formed on the inner surface of the pot. Thus, the frying pan of the above-mentioned embodiment of the present invention forms a quasi-crystalline coating on the inner surface, and the quasi-crystalline coating has a good bonding force with the pot body, is not easy to fall off, and the quasi-crystalline coating also has non-stick properties, and then At the same time, it solves the disadvantages that the iron frying pan is easy to rust and stick to the pan. In addition, the inventors also found that the corrosion resistance of the quasicrystalline coating sprayed on the iron wok made of carbon steel is close to that of 304 austenitic stainless steel, which is obviously better than the existing nitriding process. Therefore, the wok of the above embodiment of the present invention can omit the nitriding treatment of the iron wok, and the wok also has good non-stick and corrosion resistance, and its performance is significantly better than that of the existing iron wok.