44 results about "Vacuum grease" patented technology

Using a laser lift-off (LLO) nonbonding technique, freestanding 4-layer GaN / AlGaN heterostructure membranes have been formed. A 4×4 mm mask was attached to the area at the center of the most-upper AlGaN layer was attached using a nonbonding material such as vacuum grease. A microscopic slide attached by an adhesive provided support for the structure during the laser lift-off without bonding to the layers. The vacuum grease and the mask isolated the adhesive from the structure at the center. The microscopic slide served as a temporarily nonbonding handle substrate. Laser lift-off of the sapphire substrate from the heterostructures was performed. The remaining adhesive served as a supporting frame for the structure making a free-standing 4-layer GaN / AGaN heterostructure membrane. Other frameless freestanding membranes can be fabricated for a variety of applications including further III-nitride growth, heterogeneous integration, packaging of micro systems, and thin film patterns.

The invention relates to a high and low temperature resistant siloxane vacuum grease composition and its preparation method. The high and low temperature resistant siloxane vacuum grease composition is used for lubrication and sealing of high-low temperature vacuum systems and high-low temperature vacuum valves, and comprises the following components by weight: 84-93% of organosilicon polymer oil, 3-15% of silicon dioxide powder, 0.5-7% of a surface covering agent, and 0.05-2.0% of an additive. The high and low temperature resistant siloxane vacuum grease composition has excellent sealing performance and long-term storage stability, and at the same time has good compatibility with a contact surface, high and low temperature performance, adhesion performance, chemical inertness, and water resistance. The high and low temperature resistant siloxane vacuum grease composition can be used for lubrication and sealing of high vacuum systems, sealing of glass valves, ceramic ground joints, pistons, and faucets, as well as sealing elements of air pressure valves, vacuum equipment and pneumatic brakes, etc.

The invention discloses a nanoscale component laser sintering molding method and device. The nanoscale component laser sintering molding device comprises a mixed sample feeding system, an aerodynamic lens, a confocal laser group and a worktable; the mixed sample feeding system is provided with a buffer cavity. The nanoscale component laser sintering molding method comprises the steps of placing nanoparticle powder into a powder storage cavity, carrying the powder into a mixing cavity through air, adequately mixing the powder and another branch circuit of air, facilitating the obtained aerosol flow to enter the buffer cavity, further mixing the gas and nanoparticle powder, and lowering the pressure and flow rate to obtain a fluid with a Reynolds number of 200 to 700; facilitating the fluid to enter a cylindrical cavity in a laminar flow form, and spraying out the fluid in a single-particle flow form after the fluid passes through gathering holes in each lens and is focused; receiving the particles by a sintering substrate which is coated with vacuum grease on the worktable, and melting the particles by the confocal laser group; acquiring a two-dimensional pattern with nanoscale molding precision by virtue of the movement of the worktable in an X direction and a Y direction; gradually laminating the particles to obtain a component with the nanoscale molding precision by virtue of the movement of the worktable in a Z-axis direction.

A rapid preparation method for synchrotron radiation X-ray diffraction test samples of hydrogen storage materials, which relates to the technical field of synchrotron radiation X-ray diffraction testing. The capillary is inserted into a sponge, and the sponge is hermetically covered in a transparent plexiglass holder, transparent The plexiglass is supported on a metal fixed frame, and the ground powder sample is filled into the capillary through a weighing paper funnel, and the open end of the capillary is sealed with vacuum grease; Carried out in the glove box. This method can reduce the amount of samples used, realize rapid and efficient preparation of test samples, avoid oxidation of hydrogen storage materials, obtain highly accurate synchrotron radiation X-ray spectra of the materials themselves, and then understand the microstructure of materials based on these X-ray spectra.