6results about How to "Increase service temperature" patented technology

This invention discloses a SiC with an ultra-high temperature ceramic gradient coating. f / SiC composite materials, their preparation methods, and applications. A double-layer glow discharge plasma surface metallurgical method is used to prepare SiC composite materials. f A (Hf,Si,Ta)C gradient composite coating was prepared on the surface of the SiC composite material. This coating was able to resist SiC in an oxygen atmosphere at 1773 K. f Effective protection of SiC composite materials. The specific advantages of this invention are: (1) Ion bombardment of the substrate significantly improves the point defects and conductivity of the composite substrate; (2) The (Hf,Si,Ta)C coating has a continuous gradient structure, forming a good metallurgical bond between the coating and the substrate, with high bonding strength; (3) The similar thermal expansion coefficients of the (Hf,Si,Ta)C coating and the substrate can improve the thermal mismatch between the coating and the substrate, reducing the tendency for coating peeling and cracking during service; (4) The (Hf,Si,Ta)C coating system has a high service temperature and self-healing ability. The coating prepared by this invention has excellent high-temperature protection performance, improving the protection of SiC. f The high-temperature service life of SiC composite materials has broad application prospects in the aerospace field.

The invention discloses a graded-aperture flexible aerogel heat-insulating coating capable of serving for a long time in an environment of 1100 DEG C. The graded-aperture flexible aerogel heat-insulating coating belongs to the technical field of heat-insulating coatings and comprises the following components in parts by mass: 10-30 parts of aluminum dihydrogen phosphate, 10-35 parts of water, 10-30 parts of gamma-glycidoxypropyltrimethoxysilane, 5-17 parts of alpha-aluminum oxide and 1-3 parts of an emulsifier. 1-3 parts of a defoaming agent, 1-6 parts of aerogel nanofibers and 3-5 parts of aerogel powder. The back temperature of the aerogel coating with the thickness of 2-3mm can be controlled below 300 DEG C under the condition that the front surface is heated at 1050-1100 DEG C, so that the aerogel coating meets the heat insulation requirements of metals such as steel structures and the like, and has excellent fireproof performance. The coating is simple in preparation process, low in production cost, excellent in heat insulation and fireproof performance and wide in application prospect.

The utility model discloses a high-temperature-resistant support ring for a seabed aerogel thermal insulation pipe, which comprises a pair of support ring single bodies arranged in mirror symmetry, and each support ring single body comprises an arc-shaped thermal insulation plate and an arc-shaped sheath arranged on the outer wall of the thermal insulation plate; a plurality of sliding strips are uniformly distributed on the outer wall of the sheath along the circumference; the insulation board, the sheath and the inner pipe are fixedly connected through a bolt group; a heat preservation strip is arranged in a gap between the longitudinal end faces of the pair of supporting ring single bodies, and the heat preservation strip is tightly attached to the longitudinal end faces of the two supporting ring single bodies. According to the submarine thermal insulation pipe, the long-term tolerable temperature can reach 260 DEG C, and the service temperature of the submarine thermal insulation pipe can be increased; extra anti-slipping force can be provided for the aerogel heat preservation layer, and it is guaranteed that the heat preservation layer and the inner pipe do not displace and slip when the heat preservation pipe is assembled and welded and laid on the sea.

A high-temperature, high-strength zirconium alloy and its manufacturing method are disclosed, belonging to the field of nuclear engineering materials. The high-temperature, high-strength zirconium alloy comprises, by weight: 1%-10% Sn, 0.1%-1% O, 0.01%-3.5% Al, and 0.01%-0.5% Si and / or 0.01%-0.5% Ge, with the remainder being Zr and unavoidable impurities. In this high-temperature, high-strength zirconium alloy, Si and / or Ge can form thermodynamically stable precipitates at high temperatures, promoting grain refinement while pinning α-Zr grain boundaries at high temperatures, inhibiting solid-state phase transformation and grain growth in the zirconium alloy matrix at high temperatures, thus enabling the alloy to maintain good mechanical properties and microstructural stability at high temperatures.

The invention discloses a high-temperature abradable sealing coating and a preparation method thereof.The coating comprises a nickel-based high-temperature alloy substrate layer, a NiCrAlY alloy transition layer and a YSZ / CaCO3 ceramic layer which are sequentially arranged in a stacked mode, the YSZ / CaCO3 ceramic layer is prepared from YSZ ceramic powder and calcium carbonate powder, and the mass ratio of the YSZ ceramic powder to the calcium carbonate powder is (92-97): (3-8); ySZ / CaCO3 ceramic powder is prepared through a high-temperature solid-phase reaction, then NiCrAlY alloy powder is sequentially sprayed on a nickel-based high-temperature alloy substrate to form a NiCrAlY alloy transition layer through a supersonic atmospheric plasma spraying process, the YSZ / CaCO3 ceramic powder is sprayed on the NiCrAlY alloy transition layer to form a YSZ / CaCO3 ceramic layer, and the high-temperature abradable sealing coating is obtained. The coating has the characteristics of high service temperature, difficult cracking and peeling of the coating, high porosity, simple preparation process and good thermal shock resistance.

Hf6Ta2O 17 A kind of Hf6Ta2O 17 The ceramic layer, the raw material of the ceramic layer includes Hf6Ta2O 17 Ceramic powder: pore-forming agent: lubricating phase=(88~92) :(3~5) :(3~7);The preparation method is: preparation ceramic layer sprayable powder, preparation nickel-based superalloy base-transition layer, use supersonic speed atmospheric plasma spraying technology and be sprayed in the surface of nickel-based superalloy base-transition layer ceramic layer, obtain nickel-based superalloy base-transition layer-ceramic layer, until the thickness of ceramic layer is 200 μm above, complete Hf6Ta2O 17 Preparation of the nickel-based abradable seal coating, the present application has the characteristics of high service temperature, coating is not easy to crack and fall off, simple preparation process, small wear, good thermal shock resistance.