50results about How to "Control Surface Roughness" patented technology

Provided is a superconducting cable with aluminum cryostat configured to improve superconductivity by increasing reflectivity of cryostats and enhancing cooling performance. The superconducting cable includes: a core provided with a conductor; and a cryostat surrounding a periphery of the core. A material of the cryostat is aluminum or an aluminum alloy and a surface roughness of the cryostat is 30 microns or less in terms of RMS value.

The invention discloses a silver-plated conductive aramid paper and a preparation method thereof. The preparation method is as follows: a. cleaning the aramid paper substrate with a cleaning agent to remove surface impurities and drying; b. cleaning the cleaned aramid paper substrate Carry out plasma treatment to obtain a surface-activated aramid paper substrate; c. Put the plasma-treated aramid paper substrate into the silver ammonia solution, and after activation for a certain period of time, slowly drop the reducing agent into the above solution, and react for a certain period of time Afterwards, the aramid paper substrate is taken out, fully washed with deionized water and dried, and finally a silver-plated conductive aramid paper is obtained. The mass ratio of silver content in the prepared conductive aramid paper is 3%-12%, and has good electrical conductivity and electromagnetic shielding performance, and the preparation process is simple and the operation is convenient.

A technology for casing the high-Mn steel frog of combined switch for railway features that the ferrochromium sand is used as surficial sand and core sand, the alkaline Mg sand powder paint is coated on the surfaces of moulding cavity and core, and an easily cutting plate is added under the insulating siser head. It includes such steps as applying the insulating and heat generating agent to the surface of riser head, horizontal pouring, cutting off the riser head, burying it is sand, and heat treating.

Provided is a centrifugal spinning preparation method of a silicon dioxide and polystyrene micro-nano fiber membrane. The method comprises the following steps that 1, hydrophobic silicon dioxide is prepared, wherein silicon dioxide sol is prepared through a sol-gel method, hydrophobic modification is conducted on the prepared silicon dioxide sol by taking methacryloxy propyl trimethoxyl silane (MPS) as a modifying agent, and hydrophobic silicon dioxide is obtained; 2, a centrifugal spinning solution is prepared, wherein hydrophobic silicon dioxide prepared in the first step and polystyrene (PS) are mixed and dissolved in N,N-dimethylformamide (DMF), and the uniformly dispersed centrifugal spinning solution is obtained after stirring is conducted, wherein the mass concentrations of PS and SiO2 are 18+ / -2 wt% and 3+ / -1 wt% respectively; 3, centrifugal spinning is conducted, wherein centrifugal spinning is conducted by adopting the centrifugal spinning solution prepared in the second step, and the silicon dioxide and polystyrene (SiO2 / PS) super-hydrophobic micro-nano fiber membrane is obtained.

The invention discloses an opening-closing induction type batch electro-spinning device and relates to an electrostatic spinning device. A material storage box is communicated with a liquid supply device. A heating piece and a temperature sensor are arranged on an inner cavity wall of the material storage box. The heating piece and the temperature sensor are electrically connected with a temperature control box. A nozzle array is arranged at the bottom of the material storage box. Center shafts are arranged in nozzles. The center shafts penetrate through the material storage box vertically. The lower ends of the center shafts are connected with nozzle covers which are placed outside nozzle outlets. The upper ends of the center shafts extend out of the upper end face of the material storage box. A driving motor and a multi-shaft output box are arranged above the material storage box. The driving motor is arranged on the multi-shaft output box. An output shaft of the driving motor is connected with the input end of the multi-shaft output box. The output ends of the multi-shaft output box are connected with the upper ends of the center shafts. A vibration output end of a vibration generator is in rigid connection with the multi-shaft output box. Conducting metal strips are arranged on the bottom face in the material storage box at intervals horizontally and longitudinally. The conducting metal strips are connected to the ground or are electrically connected with a high-voltage power supply. A collecting device is placed below the material storage box. The collecting device is electrically connected with the high-voltage power supply or is connected to the ground.

The invention discloses a method and device for preparing a coating on the basis of a laser processing technology and belongs to the technical field of part refabrication. The method includes the steps that firstly, the surface of a workpiece is coated with a thin black organic matter layer which serves as a laser energy absorption layer; pulse laser with the power density being GW / cm<2> grade is adopted for irradiating the surface of the workpiece, so that plastic pits are formed in the surface of the workpiece; the treated surface of the workpiece is cleaned and dried; and laser pulse beams with the power density being 10<4>-10<6> W / cm<2> are adopted for irradiating spraying wires and then melting the spraying wires into liquid state, liquid spraying wires are blown by high-pressure protective gas to impact on the surface of the workpiece at a high speed, and the coating is formed. According to the method and the device, an adjustable laser device is adopted, and the laser pulse beam diameter and output energy can be controlled; the coating prepared through the method has the characteristics of being high in interface bonding force and quality; and the method and the device have the technical characteristics of being short in spraying time, low in energy consumption, free of pollution and the like.

The invention discloses a continuous annealing method for hot stamping forming steel. The continuous annealing method comprises an annealing procedure and a leveling procedure, wherein in the annealing procedure, the temperature of an uniform temperature section is 780-800 DEG C, the starting temperature of fast cooling is 670-690 DEG C, the final temperature of fast cooling is 390-410 DEG C, the final temperature of aging is 360-380 DEG C, the end temperature of a final cooling section is 140-160 DEG C, and the temperature after water quenching is 43-50 DEG C. The continuous annealing method is adopted for production, and thus the production efficiency is higher. The method is matched with the dew point in a furnace to produce products, thereby improving the combination firmness of subsequent hot stamping forming scale and a matrix. The method adopts the reasonable leveling process, is matched with a leveling working roller with certain roughness, and controls the surface roughness of band steel, thereby improving the combination firmness of subsequent hot stamping forming scale and the matrix. The scale of the hot stamping forming product produced by the method is not easy to shed off, and the combination firmness of the scale and the matrix is good.