4 results about "Bilayer" patented technology

Disclosed is a helium leakage detection device and method for a double-layer pipe with an interlayer. In a helium leakage detection tool for a double-layer pipe, an inner pipe is sleeved with an outerpipe, the inner pipe is connected with the first end of a sealing flange box in a sealed mode through a first sealing piece, the outer pipe is connected with the second end of the sealing flange boxthrough a second sealing piece, and the diameter of the first end is smaller than that of the second end; one end of the inner pipe is blocked by a first blocking plate, and the other end of the innerpipe is blocked by a second blocking plate; a helium introducing hole is formed in the first blocking plate; an inflation cover is arranged outside the outer pipe, and a helium introducing hole is formed in the inflation cover. The detection device is simple in structure, convenient to disassemble and assemble, capable of achieving air tightness testing of the inner layer and the interlayer of the double-layer pipe, high in leakage detection precision, high in detection efficiency, low in cost, capable of achieving overall testing and capable of meeting the leakage detection requirement of the double-layer pipe with the interlayer.

The invention discloses a preparation method of a tungsten disulfide single crystal with a controllable layer number. According to the preparation method, hydrogen sulfide is taken as a sulfur source,and micro-patterning on a precursor WO3 is carried out in advance to accurately regulate and control the amount of the precursor, thereby realizing controllable preparation of single-layer, double-layer, three-layer and multi-layer WS2 single crystals. The method provided by the invention has the advantages of few required raw materials, high yield and good repeatability, and the obtained crystalhas high quality and high electron mobility, and is especially suitable for preparation of large-area uniformly-distributed WS2 single crystals with controllable layer number.

A composite and a coating having engineered reflective properties are described. The composite comprises a matrix and flakes of a multilayer polymer film including one or more bilayers including at least a layer of a first polymer and a layer of a second polymer having a different refractive index than the first polymer. The coating described includes the composite as applied to a surface and has a reflectance of at least 10% for a selected wavelength range and a transmittance of at least 50% at wavelengths outside of the selected wavelength range. Also described are methods for forming the composite and the coating.

The invention provides a thin double-layer trunnion box structure which can ensure the mechanical property of the thin trunnion box structure. The structure comprises a bucket body and trunnion boxes arranged on the two sides of the bucket body, an upper waist hoop and a lower waist hoop are arranged on the upper sides and the lower sides of the trunnion boxes respectively, and the upper waist hoop and the lower waist hoop are fixed to the bucket body in a surrounding mode; a vertical plate is welded between the upper waist hoop and the lower waist hoop, a panel is arranged on the front side of the vertical plate, and the panel is fixed on the vertical plate through a ring plate; and each trunnion box penetrates through the limiting hole in the center of the panel, a supporting hole in the center of the vertical plate and a mounting hole of the bucket body, and the outer side wall of the trunnion box is connected with the limiting hole and the supporting hole in a welded mode and is in clearance fit with the limiting hole.