7 results about "Crystal density" patented technology

This invention discloses a polyamide composite material, comprising the following components by weight: 70-94 parts polyamide resin; 0.1-1 parts rice bran wax metal salt; and 5-30 parts toughening agent. The polyamide is selected from copolymer polyamide resin, or a blend of copolymer polyamide resin and homopolymer aliphatic polyamide resin, wherein, when copolymer polyamide resin and homopolymer aliphatic polyamide resin are blended, the copolymer polyamide resin accounts for 5-95 wt% of the polyamide resin. This invention utilizes a specific type of polyamide and rice bran wax salt as a nucleating agent to reduce crystal size. The combined effect results in polyamide grains with a size smaller than the visible light wavelength, increasing crystal density and enabling absorption of visible light by the grains. When the polyamide composite material is bent under stress, the resulting micro-voids do not produce light reflection, thus significantly reducing the stress whitening defect of the polyamide composite material. Furthermore, the polyamide composite material of this invention maintains good mechanical properties.

The application discloses a magnesium alloy electric arc additive repair twin crystal density regulating device and a use method, relates to the technical field of metal material additive manufacturing, and comprises an electric arc additive repair device, a high-frequency impact device and a control system. The application regulates the twin crystal density of a repair area through interlayer follow-up plastic deformation technology, improves the mechanical properties of the repair area, realizes interlayer plastic deformation by using high-frequency impact, and introduces deformed twin crystals. By controlling high-frequency impact parameters, the twin crystal density is regulated, the strength and toughness of the repair area can be significantly improved, the service life of the component is prolonged, and the application is suitable for repairing various complex shape magnesium alloy components.

Feed rate scheduling methods include measuring a topography of a grinding wheel of a machine tool, calculating a topography parameter using the topography, and calculating a feed rate scheduling parameter for a toolpath of the grinding wheel based on the topography parameter. The topography may be measured using microscopy. The topography parameter may include a plurality of parameters including a density of crystals at a given depth (C(h)) of the grinding wheel and / or an area fraction of crystals protruding at a given depth (α(h)) of the grinding wheel. The feed rate scheduling parameter may include a grinding wheel feed rate, a grinding wheel spin rate, and / or a grinding wheel cutting depth, among other parameters.

The invention discloses a method for introducing high-density twin crystals into a tantalum-tungsten alloy, which is characterized in that the tantalum-tungsten alloy prepared by vacuum electron beam melting is selected as a raw material, and a high-density twin crystal structure is introduced by adopting a method of combining thermal mechanical treatment with multi-pass high-strain-rate impact, so that the tantalum-tungsten alloy with uniform high-density twin crystals is obtained. Thermal mechanical treatment is adopted to homogenize the structure, reduce the dislocation density and remove the machining deformation stress, then multi-pass high-strain-rate impact deformation is adopted to regulate and control the microstructure in the tantalum-tungsten alloy, a high-density and uniformly-distributed twin crystal structure is introduced into the tantalum-tungsten alloy, controllable preparation of the twin crystal density is achieved, and the preparation process is simple. And the method is reasonable in design, simple and efficient in process and wide in application range.

This invention relates to cathode active materials, methods for preparing the same, and lithium secondary batteries comprising the same, wherein the cathode active material comprises at least one secondary particle, the secondary particle comprising an aggregate of primary macroparticles. According to embodiments of the invention, a cathode active material comprising secondary particles that simultaneously increase the average particle size D50 and crystal size of the primary macroparticles, thereby improving resistivity, can be provided. According to embodiments of the invention, a cathode active material with high crystal density can be provided. Therefore, by ensuring the movement path of lithium ions and minimizing defects in the crystal structure of the cathode active material, nickel-based cathode active materials with improved lifetime and resistivity characteristics can be obtained.

The invention relates to the technical field of new materials and temperature sensing, in particular to an XAlO3 (X = Gd, Tb) single-crystal optical fiber and a preparation method and application thereof. According to the invention, a raw material rod is prepared through a component modulation process, so that the raw material rod forms component mutation of GdAlO3-TbAlO3 in the axial direction, and the single-crystal optical fiber which is uniform in diameter and consistent in orientation and has lattice ion mutation at a specific position in the axial direction is obtained through a stable crystal growth process; the mutation of the lattice ions causes the mutation of the crystal density and the intrinsic sound velocity, thereby causing the sound impedance mismatch at the position and generating a sound wave reflection signal, and further realizing the ultrasonic guided temperature measurement.

The application provides a crystal structure high-throughput design method based on molecular or ion configuration, which comprises the following steps: obtaining candidate ion structure data and performing quantum chemistry calculation and electrostatic potential analysis, combining ion crystal density empirical formula calculation to predict the crystal density, and screening ion combinations with high predicted density; further generating multiple initial crystal structure models based on space group theory and Wyckoff position symmetry analysis, and realizing efficient optimization of the crystal structure through two-level optimization steps of pre-optimization by a machine learning potential model and fine optimization by first principles; and performing bonding state analysis, protonation phenomenon detection and energy and density data extraction on the optimized structure, and screening the crystal structure meeting the performance index, so as to solve the problem that it is difficult to efficiently screen and generate high-density metastable crystal structures.