76 results about "Solar absorptance" patented technology

The invention relates a preparation method of an electrochromic film having a photonic crystal structure. The preparation method solves the problem that the existing electrochromic material has irreversibility so that material reflectivity is not improved and solar absorptance is not reduced. The preparation method of the electrochromic film having a photonic crystal structure comprises the following steps of 1, base material surface treatment, 2, colloidal solution preparation, 3, film-type colloidal crystal template preparation, 4, solution preparation, 5, electrode preparation and 6, film electrochemical preparation. A polyaniline photonic crystal film having an inverse opal structure and prepared by the preparation method has excellent electrochromism response performances. The preparation method can be used for the field of preparation and production of the electrochromic film having a photonic crystal structure.

The invention discloses differing embodiments of thermal control coatings, spacecraft components having coatings, and methods for controlling the temperature of a component. In one embodiment, a thermal control coating under the invention may include one or more thermochromic multi-layer coatings and one or more solar rejection multi-layer coatings. The thermal control coating may have one or more transition temperatures at which the solar absorptance of the solar rejection coating substantially stays the same, while a thermal emittance of the thermochromic coating substantially changes.

The invention provides a flexible OSR second surface mirror thermal control coating. The thermal control coating comprises a flexible glass substrate. One side of the flexible glass substrate is firstly coated with a metal reflecting layer and then coated with an anti-oxidation layer. If there is requirement on conductibility, the other side of the flexible glass substrate is coated with a conductive film layer. The fundamental principle of the invention is to adopt a vacuum magnetron sputtering and coating technology. By coating at two sides of the flexible glass substrate, the flexible OSR second surface mirror thermal control coating with a certain physical properties, namely solar absorptance (alpha s) and emittance (epsilon h) is obtained. The flexible OSR second surface mirror thermal control coating can be pasted onto a curved surface of spacecrafts such as a satellite, etc. to raise thermal control performance. Then, the problem that a traditional rigid OSR second surface mirror thermal control coating cannot realize curved surface pasting and a product is easy to crack is effectively solved; and application range of the OSR second surface mirror thermal control coating is widened.

The invention discloses a solar selective absorbing coating which mainly consists of an infrared high reflectivity metal layer, a diffusion impervious layer, an absorbing layer and an antireflection layer in sequence; the absorbing layer is composed of a metal-medium composite material film which is expressed as SS-Ox-AlNyOz, the metal-medium composite material film is composed of metal SS molecular group, trace oxide formed by combining SS and O, and medium AlNyOz; and the antireflection layer medium material film is expressed as AlNiOj. The coating of the invention is easy to realize and simple to regulate and control in terms of preparation technique; the coating is suitable to be used in vacuum or air under low and medium temperature environment; the performance of the coating is stable; and the solar absorptance alpha thereof is more than 0.92, and the emissivity ratio thereof is less than or equal to 0.08.

A high-orbit optical remote sensor vacuum hot test external heat flow simulation method comprises the steps of firstly determining solar radiation heat flow according to on-orbit solar absorptance of an optical remote sensor (3), secondarily arranging the optical remote sensor (3) in a vacuum environment simulation chamber (1), then determining a 'sun outage' time period by judging whether the solar radiation heat flow Q1 (t) absorbed by an optical system within a orbit period is 0 or not, determining the time period of the Q1 (t) unequal to 0 as the 'sun outage' time period, adopting a solar simulator (2) and electric heater combined simulation scheme to perform outer heat flow simulation, determining that the time period of the Q1 (t) equal to 0 is a 'non-sun outage' time period, and adopting an independent electric heater simulation scheme to perform outer heat flow simulation. The problem that an existing non-contact space optical remote sensor outer heat flow simulation method does not have a solar spectral energy spectrum characteristic and directionality is solved, energy distribution of solar spectrum of the remote sensor on orbit can be accurately simulated, simulation accuracy is high, and project realization is promoted.

The invention provides a portable solar absorptance testing instrument which comprises a control system, a constant-current drive source, an LED solar simulative light source, an integrating sphere and a detector. The control system controls the constant-current drive source to drive the LED solar simulative light source, receives an illuminance output signal and outputs solar absorptance of a sample to be tested under the current wavelength. The constant-current drive source drives the LED solar simulative light source to generate a light source at a set waveband. The LED solar simulative light source is embedded in a light source hole of the integrating sphere, generates the light source at the set waveband and outputs the light source. The integrating sphere is provided with the sample to be tested, a detector hole and the light source hole. The detector detects diffuse reflection light of the inner wall of the integrating sphere and generates the illuminance output signal. A light-emitting device covering a broadband light source, the detector and the large integrating sphere are used, a high-diffuse-reflection polytetrafluoroethylene material high in reflection is pressed on the inner wall of the integrating sphere, the detector or the light-emitting device is installed on the outer wall of the integrating sphere, and the testing instrument has the advantages of being wide in spectral range, compact in structure, good in solar spectrum fitting characteristic and high in measurement precision.

The invention discloses a method for determining the total fluence of a space radiation environment effect test of a thermal control coating. According to the method, an equivalent formula when the beam current density of space continuous spectrum radiating particles is conversed into a radiating particle beam current density under certain energy is obtained according to the principle of equivalent degradation in an in-orbit and ground test on the solar absorptance of a thermal control coating, a radiation test of two groups of charged particles is carried out, curve fitting is carried out according to thermal control coating performance degradation data and radiating time data so as to determine parameters in an equivalent beam current density formula, so that the total fluence of the ground-based test can be determined. Compared with the prior art, the method has the advantages that mono-energetic electrons or protons in ground-based test equipment are adopted to simulate the injuring effect of orbit space electrons or protons on thermal control materials, and the practical operability is strong.

The invention discloses a preparation method of a low-solar-absorptance high-emissivity coating on the surface of titanium alloy TC4, relates to a preparation method of a ceramic film layer on the surface of the titanium alloy TC4, and aims at solving the problems that a titanium alloy thermal control coating prepared by adopting an existing method is high in solar absorptance, low in emissivity and high in cost, a uniform coating is difficultly obtained for the surface with a complicated shape, a process is complicated and the bonding degree between the coating and a matrix body is poor. The preparation method comprises the following steps: 1, pre-processing the titanium alloy TC4; and 2, performing micro-arc oxidation. The coating prepared by adopting the method has the roughness of 4.056 microns to 13.66 microns and the thickness of 68.1 microns to 200 microns, and the thickness of the coating is adjustable; due to in-situ growth, the bonding degree is good; the emissivity of a film layer under process conditions of a highly acidic zirconate system is more than 0.96, and the absorption rate is less than 0.32.

The invention discloses a method for preparing an alumina-ferric oxide ceramic membrane with controllable solar absorptance, relates to a method for preparing the alumina-ferric oxide ceramic membrane, and solves the problems that space stability, ultraviolet irradiation resistance and binding force are poor and the solar absorptance of a coating is difficult to adjust on a LY12 aluminium alloy surface with specific solar absorptance in the conventional method. The method comprises the following steps: 1, performing surface pretreatment and ultrasonic treatment on the LY12 aluminium alloy, and washing the LY12 aluminium alloy with distilled water and drying the LY12 aluminium alloy; 2, placing the dried LY12 aluminium alloy in a micro-arc oxidation electrolytic cell for electrolyzation to obtain a micro-arc oxidized LY12 aluminium alloy; and 3, placing the micro-arc oxidized LY12 aluminium alloy in the distilled water for hole sealing. The space stability and the binding force of the obtained ceramic membrane are good; the thickness of the membrane layer is controlled between 5 and 100 mu m and the ultraviolet irradiation resistance is good; and the solar absorptance can be controlled between 0.4 and 0.9.

The invention discloses a preparation method of a high-entropy ceramic material with good light absorption performance, the preparation method comprises the following steps: taking any five of CuO, MnO2, Fe2O3, Cr2O3, Co3O4, TiO2, ZnO and MgO powder as raw materials, carrying out ball-milling mixing, drying and grinding, then carrying out high-temperature calcination in an air atmosphere, and then cooling and grinding to obtain high-entropy ceramic with a spinel structure. The high-entropy ceramic is prepared by combining a mechanical wet grinding method and a solid-phase synthesis method, metal elements can be sufficiently and uniformly mixed, the method has the advantages of simple preparation technology, high repeatability, high production efficiency, suitability for industrial production and the like, and the prepared high-entropy ceramic is single in phase, high in purity, small in particle size and uniform in element distribution, the material has high solar energy absorptivity and good thermal stability, and can ensure the photo-thermal conversion efficiency of a solar energy absorbing material as a solar energy absorbent.

The invention discloses a preparation method of a solvent type functional coating with good solar energy absorption and infrared radiation performance. The solvent type functional coating is prepared by taking trimethylsilyl polyhedral oligomeric silsesquioxane and vinyl polyhedral oligomeric silsesquioxane as high-temperature-resistant resins and taking a high-entropy oxide ceramic material (A) 3O4 as a functional pigment. A functional coating prepared from the coating has high solar energy absorptivity, low thermal emissivity, good infrared radiation characteristic and excellent thermal shock resistance, corrosion resistance and high temperature resistance, and has important application value in the fields of solar photo-thermal utilization, infrared enhanced heat transfer, heat dissipation, energy conservation and the like.

The invention relates to a solar photo-thermal transforming absorbing film system and a preparation method thereof. The transformation absorbing film system is of a three-layer structure, and composed of an absorbing bottom layer, an absorbing middle layer and an antireflective top layer, wherein the absorbing bottom layer and the absorbing middle layer are prepared from M-A12O3 mixed hydrosol which is composed of transition metal M salt and aluminium salt and has different contents of the M salt; and the antireflective top layer is prepared from A 12O3 collosol, SiO2 collosol, and A12O3-SiO2mixed collosol. The solar photo-thermal transforming absorbing film system has a low preparation cost, the preparation method is simple and feasible, and no environment pollution is caused; and the optical property of the film system can meet the practical application requirement, that is to say, the solar absorptivity is greater than 0.90, and the emissivity is less than 0.10.

An electrostatic dissipative paint having a pigment. The pigment includes a composition according to the following formula:

(Mg_1−x,Zn_x)Ga_2+yO_4−δ

wherein the value of x is a value from about 0 to 1, y is a value from about 0 to 0.04 and δ is in the range of about 0 to about 0.03. An electrostatic dissipative coating system, a method for making an electrostatic dissipative coating, and a method for protecting a spacecraft is also disclosed.