72results about How to "Low outgassing rate" patented technology

The present invention involves a low-temperature insulating paper, and relates to a preparation method of said low-temperature insulating paper and its applications. The invention prepares the low-temperature insulating paper with superfine alkali-free glass fiber and wet paper preparation process; the definite quantity of said low-temperature insulating paper is 10-20 g/m2 and the thickness is 0. 06 - 0. 09 g/m2. The preparation method of said low-temperature insulating paper includes: beating, stirring and scattering the superfine alkali-free glass fiber, and drying after stripping in paper machine, last coiling and preparing the products. The low-temperature insulating paper in the invention can be used for vacuum multi-layer insulation structure of copious cooling liquid accumulating container and complement pipes. The low-temperature insulating paper in the invention has good adiabaticity, the degassing ratio is small in vacuum, the profiling performance is good, and it has long life and wide uses.

The invention belongs to the technical field of measurement, and in particular relates to a composite material deflating rate test system with self calibration function and a method. The system comprises a dry pump, a molecular pump, an ultra high vacuum metal angle valve, a getter pump, small pores, a quadrupole mass spectrometer, a vacuum chamber, an extractor gauge, a composite vacuum gauge, a sample room and a capacitance diaphragm gauge. The system combines three material deflating rate test methods, an accumulation method, a dynamic flow method and a double path method, and can test gas flow within the range of 1Pam<3> / s-6* 10<-12>Pam<3> / S ( if the surface area A equals to 6000 cm<2>, deflating rate measurement limit reaches 1*10<-15>Pam<3> / (s cm<2>)). The system covers material deflating rate test range 13 orders of magnitude, adopts a symmetric structure in design, and improves test efficiency and data reliability; besides, the system has function of automatic calibration on the ultra high vacuum gauge, the mass spectrometer and gas micrometeor, and has characteristics of multiple functions and high degree of integration.

The present invention discloses the method of low temperature vacuum sealing and welding between the window frame and the optical window of metal Dewar. In the welding between the window frame of kovar alloy material and the optical window of infrared transmitting material, the optical window is first vacuum plated to form Cr/Au coating as the transition layer in the parts to be welded, and the welding in performed with In as welding material at low temperature. The present invention has the outstanding advantage of low temperature welding producing no negative effect on the antireflective coating in the infrared window. Using soft In as the welding material can buffer the difference between the optical window material and the kovar alloy material in expansion coefficient. The metal Dewar has gas leakage rate superior to 3E(-12) torr.liter/sec and gas releasing rate far lower than that of traditional technological process.

The invention discloses a multilayer rubber sealing ring sealing device suitable for sealing the joint of a cavity port and a cavity cover of a vacuum cavity. The multilayer rubber sealing ring sealing device comprises a plurality of rubber sealing rings. The vacuum cavity is provided with containing tanks around the cavity port, the containing tanks are just opposite to the cavity cover, the rubber sealing rings are contained in the containing tanks in one-to-one correspondence and protrude the containing tanks, a cooling tank just opposite to the cavity cover is arranged between the neighboring containing tanks, and cooling pipes in hollow structures are contained in the cooling tanks in one-to-one correspondence; and air exhaust channels are also arranged on the side wall of the vacuum cavity, one ends of the air exhaust channels are communicated with external vacuum equipment, and the other ends of the air exhaust channels are respectively communicated with the cooling tanks. The invention aims to provide the multilayer rubber sealing ring sealing device having the advantages of simple and compact structure, good anti-leakage performance, long service life and multilayer sealing effect.

Vacuum systems comprising vacuum insulating glass (VIG) units are provided. The vacuum spaces within the VIG units are connected to one another and to one or more vacuum pumps that are configured to operate during the service lives of the VIG units.

The invention discloses a magnetic control sputtering cathode target for an ultrahigh vacuum system. An upper flange and a lower flange (15 and 16) are inside provided with cooling troughs (13 and 9) which are communicated with each other, a water inlet pipe and a water outlet pipe (1 and 2) which separate from the cooling trough (9) are welded with the cooling trough (9), the upper end part of the upper flange (15) is in screw joint with a target material mounting frame (12), the chamber of the upper flange is inside provided with a magnet holder (10) and a magnet (11), metal obturating rings (17 and 18) which are positioned at an inner layer and an outer layer edges (7 and 8) are arranged between the lower end surface of the upper flange and the lower flange (16) and are fixed by a bolt (14), a small flange (21) is welded outside the water outlet pipe (2); insulation sheets (4 and 6) are arranged between the small flange (21) and a shield enclosure (19) and a base flange (22), two O-shaped cushion rubbers are arranged between the small flange and the base flange (22) which is communicated with an exhaust tube (3), the two cushion rubbers are fixed by a bolt (20) sleeved by an insulating sleeve (5). The invention has a vacuum degree up to 6x10<-8>Pa, which can realize the preparation of metal or nonmetal film with high quality and purity.

A grey system prediction theory-based nondestructive fast charging method for lead-acid battery belongs to the technical field of lead-acid battery charging. The method comprises the following steps of: sampling a lead-acid battery charging terminal voltage U(O) (K), a lead-acid battery charging current I (O) (K), and a lead-acid battery charging temperature T (O) (K) continuously and periodically during charge of the lead-acid battery; performing grey association analysis on the continuously sampled data of the lead-acid battery charging terminal voltage U(O) (K), the lead-acid battery charging current I (O) (K), and the lead-acid battery charging temperature T (O) (K) by taking the charging current I (O) (K) as a reference sequence of grey association analysis, and ensuring that the association degree of the lead-acid battery charging terminal voltage U(O) (K), the lead-acid battery charging temperature T (O) (K), and the lead-acid battery charging current I (O) (K) meets modeling requirements. The data output by a sensor is used for periodical and continuous sampling, a grey dynamic prediction model is established according to a continuously sampled value, and pre-correction for each charging parameter is performed by the model prediction value, so dynamic real-time performance, safety and reliability of the battery charge are guaranteed, a charging speed is improved, and the thermal runaway and the undercharge are prevented simultaneously.

The invention belongs to the field of analysis and test of secondary ion probes, and particularly relates to a preparation method of a secondary ion probe sample target, for improving flatness of sample grains and reducing outgassing rate of the sample target. The sample target mainly comprises a glass sheet, epoxy resin and sample grains. The preparation method, based on a main body, namely a circular glass sheet, includes the steps of firstly, cutting to form a plurality of grooves on the glass sheet, placing the sample grains in the grooves, injecting the epoxy resin into the grooves to cure, and carrying out fine grinding and polishing on the sample target after finishing curing. The preparation method has the advantages that the outgassing rate of the sample target is low due to the fact that the epoxy resin is placed in the grooves of the glass sheet only, and accordingly vacuum keeping of a sample chamber is facilitated; since glass and mineral grains(such as zircon and apatite)have the similar hardness, the mineral grains, the epoxy resin and the glass sheet are kept at the same plane effectively during the polishing, and further flatness of edges of the mineral grains areimproved.

A process wherein outgassing rates of volatile organic compounds (VOCs) in an object, particularly habitable vehicles, are accelerated by placing the subject object in a vacuum chamber and placing heat sources either inside the object being treated, outside the object, or both. The process includes measuring and monitoring the temperature of selected surfaces inside the object being treated. The heat sources are adjusted to maintain a temperature which is safe for the materials and which will promote maximum outgassing rates. During the treatment process, while a vacuum and heat are being applied to the subject object, the gasses in the chamber are monitored for both their composition and quantity. When the outgassing rates of the VOCs reach acceptable levels, the process cycle is terminated. The vacuum in the chamber is broken to restore atmospheric pressure, and the object being treated is removed from the chamber.

The invention discloses a preparation method and device for artificial crystal synthetic mica. The method and device provided by the invention provide reliable guarantee for obtaining high-quality synthetic mica. In addition to being used as synthetic mica, each component in the raw material for preparing synthetic mica provided by the invention also has the function of removing impurities in the raw material, which lays a good foundation for forming synthetic mica and obtains high-quality synthetic mica.

The invention discloses a molding method of an integrated cold shield for an infrared detector. Extinction fins of the cold shield are directly electro-casted with a cold shield body, secondary bonding is avoided, glue for packaging is effectively controlled, the vacuum service life of the detector can be maintained for long time; and design of the cold shield body is simplified, bonded fitting and positioning surfaces are not embodied in the cold shield body, the total weight of the cold shield is decreased, power requirement for a refrigerator is lowered, and work of the cold shield is higher.

The invention relates to a rasterization dielectric lens used as a microwave output window in the technical field of high-power microwaves, in particular to a rasterization dielectric lens working with high power capacity. To overcome the defects that an existing high-power microwave transmitting antenna output window is prone to being punctured in medium output window-vacuum and medium output window-air interfaces, consequently, the transmission efficiency is not high enough, and the pulse is shortened, the rasterization dielectric lens high in power capacity, puncture threshold value and transmission efficiency and a manufacturing method of the rasterization dielectric lens are provided. The rasterization dielectric lens is composed of N metal grid bars and a medium output window. The N metal grid bars are periodically arranged in the medium output window at a certain interval p through a medium output window thickness direction penetrating manner. Due to the fact that the metal grid bars are adopted on the surface of the dielectric lens for partition, the secondary electron emissivity of the rasterization dielectric lens is smaller, the power capacity is greatly improved, the transmission efficiency is high, the phenomenon of pulse shortening is greatly reduced, and the rasterization dielectric lens can be applied to a high-power microwave output system.

The invention relates to a harmonic oscillator and electrode fixed connection method suitable for a high vacuum environment. The method comprises the following steps that: 1, a harmonic oscillator part and an electrode part are processed and manufactured, the diameter of an electrode part center hole is larger than that of a harmonic oscillator part center rod, and a fit clearance is reserved between the electrode part center hole and the harmonic oscillator part center rod, and a chamfer surface is manufactured on the upper end opening of the electrode part center hole; 2, cleaning is performed so as to remove grease on the surface of the parts; 3, vacuum pre-exhausting treatment is performed; 4, assembling is performed, and electric zero setting is performed, an indium wire is arranged into the chamfer at the upper end of the electrode central hole before electric zero setting, silica gel is applied to the gap below the electrode after the zero setting, and the silica gel is solidified to form a silica gel sealing ring; and 5, after the silica gel is solidified, the assembly of the electrode and the oscillator, together with an adjusting fixture, is arranged into a vacuum furnace, and heating, insulating and cooling are sequentially performed to fill the fit clearance between the electrode and the oscillator with indium so as to realize the fixed connection of the electrode and the oscillator. According to the method of the invention, the reliable fixed connection of the harmonic oscillator and the electrode is realized, and the prepared assembly structure meets the high-vacuum use environment.

The invention belongs to the fields of accurate determination of the composition and content of rare gas isotopes, and particularly discloses a full-metal small-volume container and a volume determination system and method. The container comprises a first normally closed type air cylinder, a first carbon steel driving rod, a first welding corrugated pipe, a stainless steel pipe gas outlet, a second normally closed type air cylinder, a second carbon steel driving rod, a second welding corrugated pipe, a stainless steel pipe gas inlet, a to-be-detected small-volume container and a base. The system includes a high-precision diaphragm gauge communicating with the stainless steel pipe gas inlet of the full-metal small-volume container, a stainless steel cold trap, a first metal valve, a second metal valve, a small-volume container with known size, a third metal valve, a fourth metal valve, a fifth metal valve, an oil-free molecular pump group, and a high-purity carbon dioxide gas bottle. The technical problems of large small-volume container measurement error and low sensitivity are solved.

The invention discloses a gas supply device and method for multi-working-medium gas micro-flow calibration. According to the gas supply device, a gas storage system formed by connecting a plurality of high-pressure gas bottles in parallel is used for providing multiple calibration gases, and the calibration gases conforming to the working medium actual gas can be provided. Through an electrical path converter and a pressure stabilizing system, the inlet and outlet pressure of the calibration gases is ensured, the pressure of the provided calibration gases is consistent with the actual pressure of the working medium gas, the actual work condition is better met, and working medium gas micro-flow calibration is more accurate. By means of the gas supply device and method, the calibration gases conforming to the working medium actual gas can be provided, and meanwhile the pressure of the provided calibration gases is consistent with the actual pressure of the working medium gas; and the gas supply method is simple, feasible and easy to operate.