756 results about "Linear expansion coefficient" patented technology

The present invention discloses a hot-end sealing device for an air preheater that compensates for the expansion difference between a sealing sheet and a backing plate, which at least includes a sealing sheet and a backing plate. The sealing sheet is provided with sealing sheet mounting holes distributed along the length direction, and the backing plate is provided with backing plate mounting holes distributed along the length direction. The linear expansion coefficient of the sealing sheet is different from that of the backing plate. The sealing sheet and the backing plate are relatively fixed by clamping bolts that simultaneously pass through the sealing sheet mounting holes and the backing plate mounting holes. One end close to the rotor central cylinder is the expansion starting end, and the clamping bolts at the expansion starting end are fully tightened and fixed, while the remaining clamping bolts are not fully tightened and fixed, so that the sealing sheet and the backing plate freely expand towards the other end close to the rotor outer edge angle steel after being heated. At least one set of two-dimensional guiding mechanisms is arranged between the sealing sheet and the backing plate downstream of the expansion starting end. The above device maximally compensates for the triangular air leakage area at the hot end of the air preheater, significantly reduces the air leakage rate of the air preheater, has good stability and a long service life.

The present disclosure belongs to the technical field of quantum-dot diffusion plate, and specifically relates to a quantum-dot diffusion plate, and preparation method and use thereof. The quantum-dot diffusion plate includes a diffusion layer, a quantum-dot layer and a transparent layer, and the quantum-dot layer is disposed between the diffusion layer and the transparent layer. On one hand, in the design where the diffusion layer and the transparent layer are at the bottom and the top, luminous efficiency of the diffusion plate can be guaranteed while inactivation of quantum dots can be avoided from external factors during use and storage, and the brightness retention rate can be enhanced, for the quantum dots are protected between the bottom layer and the top layer; on the other hand, the base materials of the top, middle and bottom layers in the present invention are the same, so that the linear expansion coefficients of the respective layers are consistent, thereby effectively avoiding the anamorphose resulted by dimensional discrepancy between layers due to the variation in ambient temperature during use and storage.

The invention relates to the technical field of polyphenylene sulfide, and discloses a polyphenylene sulfide composite material with a low expansion coefficient and a preparation method thereof, the polyphenylene sulfide composite material with the low expansion coefficient comprises 100 parts by weight of polyphenylene sulfide resin, 10-50 parts by weight of polyphenylene sulfide grafted glass fiber, and 0.3-0.7 part by weight of an antioxidant; according to the invention, the polyphenylene sulfide grafted glass fiber and the polyphenylene sulfide resin are subjected to melt blending, and due to a polyphenylene sulfide molecular chain grafted on the surface of the glass fiber, the compatibility between the glass fiber and the polyphenylene sulfide resin is improved, and the interface performance between the glass fiber and the polyphenylene sulfide resin is improved, so that the glass fiber has a better reinforcing effect and bending strength; the bending modulus and the impact strength are obviously increased, the linear expansion coefficient and the shrinkage rate are obviously reduced, and the molding size stability of the material is very good.

The invention relates to the technical field of fluid control, in particular to an air leakage valve and a fluid control device.The air leakage valve comprises a bearing plate and a valve element assembly, and the valve element assembly is provided with a flow guide plate, a middle plate, a valve plate and a bottom plate; one side of the supporting plate in the thickness direction is fixedly connected with one side, deviating from the middle plate, of the guide plate, and the valve plate is provided with a first deformation area and a second deformation area. According to the air leakage valve, the supporting plate and the guide plate, the middle plate, the valve plate and the bottom plate which form the modularized valve element assembly are all of a plate-shaped structure, so that the thinning degree of the air leakage valve is further improved; each layer of flat plate-shaped component can even be made of materials with the same or similar linear expansion coefficient, so that the problem of failure of the air leakage valve caused by poor temperature stability or temperature change is effectively solved; the flow path holes are arranged in a staggered and far-away manner, so that the sealing path is enlarged, the failure caused by poor sealing due to entry of foreign matters can be avoided, and the foreign matter interference resistance and the sealing reliability of the air leakage valve are greatly improved.

The invention relates to an information source number estimation method based on linear expansion and contraction coefficient correction differential operation. The method comprises the following steps: firstly, calculating a linear expansion and contraction coefficient and a first-order differential value of the linear expansion and contraction coefficient by utilizing a characteristic value of an array sample covariance matrix; secondly, the estimation value of the initial information source number is completed by searching the maximum first-order difference value under the assumed information source number k; thirdly, constructing a second-order difference value of a linear expansion coefficient based on the new assumed information source number k around the initial information source number estimation value, and constructing a correction factor based on the second-order difference value; and finally, searching a k value which enables the sum value of the first-order difference value and the correction factor to be maximum to complete final signal source number estimation. The method has universality for various scenes under large-scale array configuration, and compared with an existing mainstream signal source number estimation method, the method can provide higher estimation precision and has the good capability of estimating the large signal source number.

The present invention provides a laser glass with higher thermal conductivity and lower linear expansion coefficient. The laser glass, whose components are expressed in molar percentage, contains: P2O5: 50.0-59.0%; B2O3: 7.8-20.0%; Al2O3: 5.0-12.0%; Na2O: 0.5-9.0%; MgO: 0.5-6.0%; Yb2O3: 5.0-9.6%; Er2O3: 0.03-0.6%; Cr2O3: 0.04-0.5%. Through reasonable component design, the laser glass obtained by the present invention has a lower linear expansion coefficient and higher thermal conductivity, and at the same time has a longer radiation life, which is beneficial to the improvement of laser gain performance, can improve the thermal properties of laser glass, reduce or avoid damage and cracking of laser glass during operation, and optimize the equipment stability and laser quality of laser glass in high-power or continuous output scenarios.

The invention relates to the technical field of auxiliary power, in particular to an air supply device of an auxiliary power system. The device comprises an air inlet duct shell, an air inlet air pocket, an air inlet duct outer ring, an air inlet volute, a labyrinth ring, a locking unit and a rotor. The axial end face of the air inlet air pocket is coaxially connected with the air inlet channel shell in an abutting mode. The air inlet channel outer ring comprises an outer sealing cylinder and an outer extending ring which are coaxially and fixedly connected, and the axial end face of the outer extending ring is coaxially connected with the air inlet air pocket in an abutting mode. The air inlet volute comprises a volute positioning cylinder and a spiral air channel shell which are fixedly connected, and the end face of the air inlet volute coaxially abuts against the outer extending ring. The labyrinth ring is clamped between the air inlet channel outer ring and the air inlet volute, the inner peripheral wall and the outer peripheral wall are attached to the first sealing face and the second sealing face respectively, the radial linear expansion coefficient of the labyrinth ring is larger than that of the first sealing face and that of the second sealing face, the labyrinth ring comprises a ring body and a plurality of pressure reduction gear rings axially arranged at intervals, and a stepped pressure relief cavity is formed between every two adjacent pressure reduction gear rings. In this way, the problem that gas leakage is prone to occurring at the connecting position of the air inlet end shell of the auxiliary power system is solved.

To provide an optical glass with excellent formability, high stability during the production process, and excellent color correction over a broad range, as well as an optical element including the optical glass.SOLUTION: An optical glass according to the present invention is characterized in that: the refractive index (nd) at the helium d-line wavelength (587.6 nm) is in the range of 1.45000 to 1.65000; the ISO color characteristic index (ISO / CCI) is 0.00 for blue (B), 0.80 or less for green (G), and 0.80 or less for red (R); and the value of S, derived from the equation S=E α / (1-ν), is within the range of 0.70×106 or more and less than 1.03×106 (Pa / °C), where E denotes Young's modulus (unit: GPa), α denotes the average linear expansion coefficient in the temperature range of 100°C to 300°C (unit: 10-7°C-1), and ν denotes Poisson's ratio.SELECTED DRAWING: None

The utility model relates to a PE (Poly Ethylene) water supply reinforced pipe which comprises an inner layer, a middle layer and an outer layer, the inner layer and the outer layer are made of high-density polyethylene resin, the middle layer is a hole net pipe steel framework, and the hole net pipe steel framework is adhered with the high-density polyethylene resin of the inner layer and the outer layer through hot melt adhesive. According to the PE water supply reinforced pipe, the steel-plastic composite technology is adopted, the PE plastic pipe is improved from the product structure, the problem that the wall thickness is not uniform is solved, and nearly half of raw materials are saved. The product has high compressive strength and creep resistance, good ring stiffness and impact resistance, low linear expansion coefficient and heat conductivity coefficient, good weldability, environmental stress cracking resistance and rapid cracking resistance, and is convenient to construct, simple in welding process and low in engineering comprehensive cost.

The invention relates to a sample preparation method for coating thickness detection, which comprises the following steps: circularly heating and cooling a base material to obtain a weakly combined base material with a base material body and a coating locally separated; and forming a cut extending along the thickness direction of the coating in a local separation area of the coating of the weak combination base material to obtain a coating section sample vertical to the surface of the base material. Due to the difference of linear cutting expansion coefficients of a base material body and a coating, alternating thermal stress is initiated at the interface of the base material body and the coating through cyclic heating and cooling processes, so that the base material and the coating are controllably and locally separated, a weakly combined base material is obtained, and a cut extending in the thickness direction is prepared in the surface of the locally separated coating. A coating section sample perpendicular to the surface of the base material can be obtained through simple mechanical separation. The method can be used for efficiently preparing a coating sample with clear section and good integrity at low cost on the premise of not depending on expensive or high-damage equipment.

The invention provides a deformation control device and method in the additive manufacturing process of a GH4099 hollow thin-wall component, and relates to the technical field of high-temperature alloy additive manufacturing, the deformation control device comprises a laser welding device which comprises a rotary table and an expansion tool, and the laser welding device is fixed to a mechanical arm; a temperature control tool, a side clamp and an upper clamp are sequentially arranged above the rotary table from bottom to top, and a heating wire is arranged in the temperature control tool; the linear expansion coefficient of the expansion tool is higher than that of the temperature control tool, the side clamp, the upper clamp and the GH4099 hollow thin-wall component, the melting point of the expansion tool is lower than that of the GH4099 hollow thin-wall component, a sheet metal hole is formed in a top plate of the GH4099 hollow thin-wall component, and the wall thickness of the GH4099 hollow thin-wall component is not larger than 1 mm. The to-be-welded part and the tool are rotated through the rotary table, the laser welding device is kept relatively static in the welding process, the expansion tool is positioned inside, the expansion tool is heated to expand in the welding process, the to-be-welded part is fixed, the to-be-welded part is melted and flows out after welding is completed, and deformation control over the GH4099 hollow thin-wall component is achieved.

The invention relates to the technical field of sealing rings, and discloses a wide-temperature-zone sealing ring which comprises a sealing ring body, the sealing ring body comprises a sealing layer, a thin film layer and a compensation layer, the outer portion of the thin film layer is arranged in the sealing layer, and the outer portion of the compensation layer is arranged in the thin film layer; the sealing layer and the thin film layer are supported by different materials and are made of fully-sealed elastic flexible materials, and the thickness of the thin film layer is smaller than that of the sealing layer; the compensation layer and the sealing layer are supported by different materials, and the linear expansion of the materials of the compensation layer and the sealing layer is opposite; the thickness of the compensation layer is inversely proportional to the thickness of the sealing layer according to the linear expansion coefficients of the two materials. The materials of the sealing layer and the compensation layer are selected, so that the compensation layer expands at low temperature to offset lost sealing pressure, the compensation layer shrinks at high temperature to buffer excessive extrusion, uniform contact stress of the sealing ring is maintained in extreme temperature fluctuation, and the effect of zero-damage self-adaptive sealing in the whole temperature range is achieved.

The invention discloses liquid tank assembly welding equipment and a welding thermal compensation method, and relates to the technical field of liquid tank assembly welding, and the specific method comprises the following steps: obtaining a real-time linear expansion coefficient introducing temperature nonlinearity, calculating to obtain total welding deformation superposed by thermal expansion and phase change shrinkage through a calibrated phase change fraction and a phase change volume expansion coefficient, and obtaining the welding residual strain of the previous layer through the residual strain coefficient, correcting the actually measured welding strain in the strain data, obtaining the corrected actually measured strain of the current layer, and driving and adjusting the welding path of the next layer according to the total welding deformation when entering the welding of the next layer. The corrected actual measurement strain of the current layer is directly written into a system register and covers the actual measurement welding strain, through dynamic calibration of a linear expansion coefficient, welding gun path compensation is directly guided, actual measurement data of the current layer are corrected, and a complete chain of parameter correction, deformation calculation, path compensation and residual stress closed-loop control is formed; and finally, the effect of reducing the multi-layer welding thermal deformation error is achieved.

The invention relates to the technical field of building construction intellectualization, in particular to a building construction intelligent monitoring system based on multi-source sensor data fusion. Comprising a data acquisition and storage unit; a data fusion processing unit; the construction state analysis unit uses an improved anomaly detection algorithm; a risk assessment early warning unit; and a visualization and decision-making unit. Through the dynamic adaptation module, the structural displacement feature weight is adjusted based on the construction stage parameters to preferentially extract the construction key stage structural features, and the structural material elastic deformation limit is corrected in combination with the material linear expansion coefficient and the temperature difference value; meanwhile, the dynamic critical generation module generates a risk critical judgment basis changing along with the construction process in combination with structural bearing capacity parameters and equipment mechanical stress limits in the construction stage, so that the problem that abnormal detection and risk judgment are lack of dynamic adaptability is solved; and the accuracy of personnel border crossing, equipment abnormity and structure abnormity identification and the adaptability of risk assessment are effectively improved.

The invention relates to the technical field of silencer machining, in particular to a production and machining control system and method for an air conditioner silencer, and the method comprises the steps: obtaining an equivalent gap of a joint region, and determining whether the joint gap of a welding region is in a standard interval or not; when the joint gap is in the standard interval, the critical stress of the joint area is estimated according to the joint gap of the welding area and the linear expansion coefficient of the assembly material, and the risk level of the copper pipe in the joint area during high-frequency brazing is determined; when the copper pipe in the joint area is at the first risk level, the welding mode of high-frequency brazing is determined according to the critical stress; after the welding mode of brazing is determined, the welding stage where a weld joint is located is determined according to the temperature rising speed, and a corresponding brazing strategy is adopted; the current fluctuation of the induction coil is detected in the high-frequency brazing process, and the initial current frequency is adjusted back according to the fluctuation duration. The dissimilar metal welding defect rate is reduced by adjusting the welding mode and the brazing strategy of high-frequency brazing.

The present invention relates to a concrete surface crack detection method and system based on a machine learning algorithm, which obtains concrete wave velocity, frequency, amplitude, strength, elastic modulus, temperature, and linear expansion coefficient, analyzes characteristic parameters, establishes a mathematical relationship model, fits data using a machine learning algorithm, determines model parameters, inputs relevant parameters of the concrete to be detected into a multi-parameter digital quantity plate model, and the model calculates the potential risk and predicted value of the crack. The multi-parameter digital quantity plate model is applied to real-time detection of concrete structures to realize quality assessment and crack prediction, and the concrete structure is regularly monitored to update model data. The system includes data acquisition, data preprocessing, feature extraction, crack measurement, multi-parameter digital quantity plate model establishment, multi-parameter comprehensive analysis, real-time monitoring and early warning, database management, and user interface and interaction modules.

The present invention provides glass fibers that make it possible to achieve excellent long-term production stability and that, when used in a glass fiber–reinforced resin molded article, can reduce the linear expansion coefficient in the MD direction and thereby reduce anisotropy. Glass fibers according to the present invention include a plurality of glass filaments. Relative to the total mass thereof, the glass fibers include 60.0–69.0 mass% of SiO2, 18.0–26.0 mass% of Al2O3, 8.0–14.0 mass% of MgO, and 0.0–4.9 mass% of CaO, the total SiO2, Al2O3, MgO, and CaO content being at least 95.0 mass%. The glass filaments have a flat cross-sectional shape, the ratio (major axis / minor axis) of the major axis to the minor axis is 1.2–5.5, and the SiO2 content S, the Al2O3 content A, the MgO content M, the CaO content C, and the ratio (major axis / minor axis) D of the major axis to the minor axis satisfy expression (1).　(1) 228.9≤(S / A)×(C+M)2 / D1 / 4≤588.9

The invention discloses a low linear expansion coefficient glass fiber reinforced nylon material and a preparation method, and relates to the technical field of polymer composites.The low linear expansion coefficient glass fiber reinforced nylon material is prepared from, by weight, 20-45 parts of glass fiber, 20-60 parts of synthetic polymer and 15-30 parts of additive A. The synthetic polymer is nylon resin, and the additive A is a flexibilizer; the flexibilizer is an acrylamide-acrylic acid-1-ethyl-3-methylimidazolium ethyl sulfate random copolymer, and by preparing the modified carbonized polyimide compound, the tensile strength, the bending strength and the impact toughness are enhanced, the specific strength and the specific stiffness are good, and the electrical insulation performance and the heat-resistant insulation performance are excellent; the problems that the material cannot be used and is easy to crack and cannot be insulated and heat-preserved under extreme temperature conditions are solved.

The invention discloses a vibrating diaphragm assembly, a sound production device and electronic equipment. The vibrating diaphragm assembly comprises a vibrating diaphragm body and a ball top, and the vibrating diaphragm body and the ball top are integrally formed. The vibrating diaphragm body comprises at least one elastomer layer, the elastomer layer comprises a modified polystyrene-poly (ethylene-butylene)-polystyrene block copolymer and a heat-conducting filler, and the modified polystyrene-poly (ethylene-butylene)-polystyrene block copolymer contains an epoxy group. The heat-conducting filler accounts for 0.5 wt%-15 wt% of the total amount of the elastomer layer, the heat conductivity coefficient of the elastomer layer is 0.5 W / m * K-30W / m * K, and the linear expansion coefficient of the elastomer layer is 0.5 * 10 <-5 > / DEG C-80 * 10 <-5 > / DEG C. The elastomer layer can be combined with the heat-conducting filler through an intermolecular acting force to limit the deformation of the elastomer layer, so that the linear expansion coefficient can be reduced, the surface of the vibrating diaphragm body is kept flat, and the high-temperature resistance and the sound production effect of the vibrating diaphragm assembly can be improved.

An anti-resonant hollow-core optical fiber (10) according to one embodiment of the present invention is provided with: an outer cladding (11) having a tubular shape; a plurality of inner cladding elements (12) each having a tubular shape and in contact with the inner wall surface of the outer cladding (11); and a cladding layer (14) that covers the outer cladding layer (11), and the space surrounded by the plurality of inner cladding layers (12) of the anti-resonant hollow-core optical fiber (10) forms a core region (11d). The average linear expansion coefficient of the outermost layer of the coating layer (14) at 20 DEG C to 30 DEG C is 10 * 10 <-5 > [ / DEG C] or less, the average linear expansion coefficient of the outermost layer of the coating layer (14) at-60 DEG C to-50 DEG C is 6 * 10 <-5 > [ / DEG C] or less, and the in-site elastic modulus of the outermost layer of the coating layer (14) is 1500 MPa or more.

The invention belongs to the technical field of capacitor materials, and particularly relates to a capacitor packaging material, a preparation method and application thereof and a capacitor packaging method. The capacitor packaging material comprises a resin component A, a curing component B and a bonding component C, the resin component A contains bisphenol A epoxy resin I, polyether polyol I and optional rubber toughening agent I and modified silicon dioxide I; the curing component B contains anhydride and optional rubber toughening agent II and modified silicon dioxide II; the bonding component C contains epoxy modified acrylic resin and bisphenol A epoxy resin II. The key point of the capacitor packaging material is that the specific coupling agent modified silicon dioxide, the rubber flexibilizer, the modified anhydride and the epoxy modified acrylic resin are introduced into the capacitor packaging material, and all the components cooperate with one another to play a synergistic role, so that the capacitor packaging material has a relatively low linear expansion coefficient and relatively high toughness; the cured packaging material is free of cracking, and the contact surface between the packaging material and the ceramic is well combined without gaps.

A vehicular ceiling interior component includes a board member that is a plate member and configured as a ceiling of a vehicular compartment, and a reinforcing member having an elongated shape and extending in an elongated direction. The reinforcing member is disposed on a vehicular exterior side surface of the board member and made of material having a linear expansion coefficient greater than a linear expansion coefficient of material of the board member. The reinforcing member includes a first fixing portion and a second fixing portion each of which is fixed to the vehicular exterior side surface of the board member and that are arranged along the elongated direction, and a connection portion that connects the first fixing portion and the second fixing portion and is away from the vehicular exterior side surface of the board member.

An alpha-sialon phosphor which is represented by general formula (Cax, Euy) (Si12-(m + n) Alm + n) (OnN16-n), and which has an average linear expansion coefficient (alpha ') at 25-900 DEG C of 4.2-4.6 ppm / DEG C (inclusive). In the general formula, 0 < x < 2.0, 0 < y < = 0.5, 0.3 < = x + y < = 2.0, 0 < m < = 4.0, and 0 < n < = 3.0.

To provide a solid composition which achieves both a low dielectric constant and a low coefficient of linear expansion.SOLUTION: A solid composition contains a fluorine resin, and a fibrous anisotropic filler, where a reduction rate of a coefficient of linear expansion at 20°C to 200°C of the solid composition to a coefficient of linear expansion at 20°C to 200°C of the fluorine resin is 50% or more.SELECTED DRAWING: None

The invention discloses a high-thermal-conductivity aluminum-based composite material with an adjustable thermal expansion coefficient and a preparation method, and belongs to the field of composite materials. The material comprises a negative thermal expansion reinforcing body, a high thermal conductivity reinforcing body and an aluminum matrix, the total volume content of the negative thermal expansion reinforcing body and the high thermal conductivity reinforcing body accounts for 10-70 vol.%, the volume content of the negative thermal expansion reinforcing body accounts for 5-65 vol.%, the volume content of the high thermal conductivity reinforcing body accounts for 5-65 vol.%, and the balance is the aluminum matrix. The negative thermal expansion reinforcer is one or a combination of more than two of a ceramic material, an intermetallic compound and an alloy, and the average linear expansion coefficient or the volume expansion coefficient of the ceramic material, the intermetallic compound and the alloy is negative when t DEG C is greater than-100 DEG C and less than 300 DEG C; the high-thermal-conductivity reinforcer is one or a combination of more than two of inorganic non-metallic materials with the thermal conductivity higher than that of the aluminum matrix; and the aluminum matrix is one or a combination of more than two of aluminum alloy or pure aluminum in which the mass percentage of aluminum is more than 50%. The solid-phase sintering technology is adopted, and the volume fraction is accurately controlled.

A semiconductor device includes a first die pad, a first semiconductor element, a sealing resin, and a reinforcement member. The first semiconductor element is bonded to the first die pad. The sealing resin covers the first semiconductor element. The reinforcement member is bonded to the first die pad. The linear expansion coefficient of the reinforcement member is smaller than the linear expansion coefficient of the sealing resin. In one example, the reinforcement member is covered with the sealing resin. The reinforcement member is located on the same side as the first semiconductor element in a first direction with respect to the first die pad.

To provide a Ni-based alloy with a linear expansion coefficient comparable to that of copper or copper alloy, a continuous casting mold with its inner surface coated with the Ni-based alloy, and a method for producing the same.SOLUTION: A Ni-based alloy comprises Mn of 15.0-35.0 mass%, B of 0.2-3.5 mass%, and Si of 0-4.5 mass%; optionally, at least one selected from the group consisting of Mo, Cu, and Cr, with the total amount of Mo, Cu, and Cr being 0-20.0 mass%; optionally, at least one selected from the group consisting of Fe and Co, with the total amount of Fe and Co being 0-10.0 mass%; and the balance being Ni and unavoidable impurities.SELECTED DRAWING: None

The invention provides a polycarbonate resin composition that is excellent in flowability and heat resistance and has a low linear expansion coefficient. The invention is a polycarbonate resin composition including, per 100 parts by weight of a component including 20 to 90 parts by weight of (A) a polycarbonate-based resin (component A) and 80 to 10 parts by weight of (B) an ABS resin (component B), 5 to 45 parts by weight of (C) a silicate mineral (component C). The polycarbonate resin composition is characterized in that the component B has an SO42- content of 1 ppm or more and a PO43- content of less than 1.5 ppm.

The invention discloses a thermoplastic polyimide composite material for piston ring, a preparation method and a piston ring, which are composed of the following materials by mass percentage: thermoplastic polyimide 60-70; polyetheretherketone 10-20; modified carbon fiber 10-15; graphene oxide 5-10; chain extender 1-3; lubricant 1-2; antioxidant 0.5-1. The disadvantages of high wear rate, high linear expansion coefficient and inability to withstand high temperature of traditional piston rings are solved; the modification of carbon fiber reduces the probability of fiber shedding during the wear process, and reduces furrow wear and adhesive wear. The addition of graphene oxide further reduces the friction coefficient of the composite material, and a stable lubrication transfer film can be generated under long-term high load, solving many difficulties in the melt blending processing of thermoplastic polyimide high-temperature materials.

Provided is a coating composition capable of forming a coating film layer, which has low coefficient of linear expansion at low dielectricity, excellent adhesive properties even when the surface of a counterpart material is smooth, and few coating film defects such as cracks and holes. A coating composition including 2 or more kinds of fluororesin emulsions, wherein at least 1 kind of the fluororesin, a fluororesin (I), has a number of functional groups of 30 to 1,000 per 106 main-chain carbon atoms, and the coating composition further includes an anisotropic filler, a surfactant, and a liquid medium.