Glass is the most important material that can hardly be replaced in wood walls and doors and windows. Although the discovery of glass technology offers many options, the glass that is mainly used for lighting is placed in a curtain wall with multiple functional requirements. The problem is not simple. Glass is energy-saving. The contribution cannot be ignored. The energy saving of glass can't be separated from the reflection, transmission, scattering and concentrating properties of glass itself. The use of light and anti-glass is the most important material that can hardly be replaced in wood walls and doors and windows, although the discovery of glass technology provides There are many choices, but the glass, which is mainly used for lighting, is placed in a curtain wall with multiple functional requirements. The problem is not simple. The contribution of glass to energy saving cannot be ignored. The energy saving of glass can not be separated from the reflection and transmission of glass itself. The scattering, light-gathering properties, and the use of light reflection, refraction, scattering, and spotlights for uniform distribution of indoor light to avoid sunlight glare and prevent heat radiation will play a major role.
Endothermic glass: Absorbs or reflects specific wavelengths in the solar spectrum. Endothermic glass is a body-tinted glass in which a colorant is added to transparent glass. Although the thermal resistance of the heat-absorbing glass is better than that of the coated glass and the normal transparent glass, the heat absorption function and the light transmission are often contradictory due to the heat released into the room during the secondary radiation process, so the heat-insulating function of the heat-absorbing glass Subject to certain restrictions, a significant portion of the heat absorbed by the heat-absorbing glass will still be transmitted to the interior. Therefore, when the shrapnel is used, the overall effect is not ideal.
Heat-reflecting coated glass: The optical properties are reflected thermal radiation. Once the reflectivity and projection rate are determined, the unidirectional characteristics are particularly prominent. That is, it can only meet part of the changes in the building environment, such as the heat resistance and heat absorption requirements that change with the season. Moreover, the heat-resisting properties of the heat-reflective coating and the heat-absorbing glass are sacrificed at the expense of light transmission, and in most cases are not conducive to natural lighting.
LOW-E glass: Low surface emissivity and high infrared reflectivity. Less heat absorption, low heating, low secondary radiation heat, in addition, light transmittance can be 33%-72%, shading coefficient is chosen between 1.25-0.8. However, there is still a directional problem in the thermal radiation reflectivity of LOW-E glasses. Experiments have shown that, regardless of whether the LOW-E Mo surface is on the second or third side of the insulating glass, the test results of the thermal conductivity are in winter and summer. Only a difference of 2%. The conclusion is that the effect of blocking the transmission of thermal radiation has nothing to do with the season.
Insulating glass: It is an effective support between two or more pieces of glass (called glass substrate), sealed around by glue, (called gas chamber) is always filled with dry gas, making it energy-saving , heat insulation, anti-condensation and other three basic functions of the product.
Foil glass: refers to a glass product made of iron with an organic film, broken under strong enough impact, and the glass aged film can adhere to the organic film without scattering. The architectural glass organic film is composed of a polyester film surface-metallized and laminated with another layer of polyester film. The surface of the organic film is coated with a wear-resistant layer and the back is coated with mounting glue, and a protective film is applied to the surface of the glass. Provides enhanced glass safety (resistance to impact and supporting glass fragments), or solar control properties that reduce solar radiation heat and block UV light.
Using glass and organic films with security, energy saving and other properties is a feasible technical means to improve the safety of building glass and improve the energy-saving effect of buildings. It can enhance the impact strength of non-safety glass and prolong the external force of glass. Broken time can prevent ginseng and property damage caused by glass splashing. Namely: The film made of transparent security film does not increase the mechanical strength of the glass itself, but because the polyester base film of the film has very good humanity and impact resistance, when the film is subjected to violent impact by external force, the film will absorb. A lot of impact. It is quickly attenuated, resulting in the film glass being hard to break down and still maintaining good film glass integrity. The main functions of glass-laminated building energy-saving film are solar control, energy saving, safety explosion-proof, glare blocking, ultraviolet light blocking, and glass surface protection. This kind of film has a certain safety performance. Still have different requirements for building energy-saving power. Its performance indicators include visible light projection ratio, visible light reflectance, shading coefficient, U value and other indicators.
Gel glass: A hollow silicate glass filled with a medium silicate glass, called aerogel, has a particle layer thickness of only 16 mm, a light transmittance of 45%, and a heat transfer system U value of 1.0. Transparent vision that is almost the same as that of insulating glass, and makes the light entering the room evenly distributed. Light transmission and high insulation are the main characteristics of gel glass. The low-temperature radiation on the inside is much lower than that of ordinary insulating glass, so it is possible to ensure that the indoor temperature in winter is higher. At the same time, it provides a great space for the refraction of light. The maximum transmission of light depends only on the incident angle of the sun to a small degree. Therefore, the natural light of daylight is uniformly distributed in the indoor space.
Endothermic glass: Absorbs or reflects specific wavelengths in the solar spectrum. Endothermic glass is a body-tinted glass in which a colorant is added to transparent glass. Although the thermal resistance of the heat-absorbing glass is better than that of the coated glass and the normal transparent glass, the heat absorption function and the light transmission are often contradictory due to the heat released into the room during the secondary radiation process, so the heat-insulating function of the heat-absorbing glass Subject to certain restrictions, a significant portion of the heat absorbed by the heat-absorbing glass will still be transmitted to the interior. Therefore, when the shrapnel is used, the overall effect is not ideal.
Heat-reflecting coated glass: The optical properties are reflected thermal radiation. Once the reflectivity and projection rate are determined, the unidirectional characteristics are particularly prominent. That is, it can only meet part of the changes in the building environment, such as the heat resistance and heat absorption requirements that change with the season. Moreover, the heat-resisting properties of the heat-reflective coating and the heat-absorbing glass are sacrificed at the expense of light transmission, and in most cases are not conducive to natural lighting.
LOW-E glass: Low surface emissivity and high infrared reflectivity. Less heat absorption, low heating, low secondary radiation heat, in addition, light transmittance can be 33%-72%, shading coefficient is chosen between 1.25-0.8. However, there is still a directional problem in the thermal radiation reflectivity of LOW-E glasses. Experiments have shown that, regardless of whether the LOW-E Mo surface is on the second or third side of the insulating glass, the test results of the thermal conductivity are in winter and summer. Only a difference of 2%. The conclusion is that the effect of blocking the transmission of thermal radiation has nothing to do with the season.
Insulating glass: It is an effective support between two or more pieces of glass (called glass substrate), sealed around by glue, (called gas chamber) is always filled with dry gas, making it energy-saving , heat insulation, anti-condensation and other three basic functions of the product.
Foil glass: refers to a glass product made of iron with an organic film, broken under strong enough impact, and the glass aged film can adhere to the organic film without scattering. The architectural glass organic film is composed of a polyester film surface-metallized and laminated with another layer of polyester film. The surface of the organic film is coated with a wear-resistant layer and the back is coated with mounting glue, and a protective film is applied to the surface of the glass. Provides enhanced glass safety (resistance to impact and supporting glass fragments), or solar control properties that reduce solar radiation heat and block UV light.
Using glass and organic films with security, energy saving and other properties is a feasible technical means to improve the safety of building glass and improve the energy-saving effect of buildings. It can enhance the impact strength of non-safety glass and prolong the external force of glass. Broken time can prevent ginseng and property damage caused by glass splashing. Namely: The film made of transparent security film does not increase the mechanical strength of the glass itself, but because the polyester base film of the film has very good humanity and impact resistance, when the film is subjected to violent impact by external force, the film will absorb. A lot of impact. It is quickly attenuated, resulting in the film glass being hard to break down and still maintaining good film glass integrity. The main functions of glass-laminated building energy-saving film are solar control, energy saving, safety explosion-proof, glare blocking, ultraviolet light blocking, and glass surface protection. This kind of film has a certain safety performance. Still have different requirements for building energy-saving power. Its performance indicators include visible light projection ratio, visible light reflectance, shading coefficient, U value and other indicators.
Gel glass: A hollow silicate glass filled with a medium silicate glass, called aerogel, has a particle layer thickness of only 16 mm, a light transmittance of 45%, and a heat transfer system U value of 1.0. Transparent vision that is almost the same as that of insulating glass, and makes the light entering the room evenly distributed. Light transmission and high insulation are the main characteristics of gel glass. The low-temperature radiation on the inside is much lower than that of ordinary insulating glass, so it is possible to ensure that the indoor temperature in winter is higher. At the same time, it provides a great space for the refraction of light. The maximum transmission of light depends only on the incident angle of the sun to a small degree. Therefore, the natural light of daylight is uniformly distributed in the indoor space.
The preparation technology of Si3N4 ceramics has developed rapidly in the past few years. The preparation process mainly concentrates on reaction sintering method, hot pressing sintering method, atmospheric pressure sintering method, gas pressure sintering method, etc. Due to different preparation processes, various types of Silicon Nitride Ceramics have Different microstructures (such as porosity and pore morphology, grain morphology, intergranular morphology, and intercrystalline second phase content). Therefore, the performance varies greatly. In order to obtain Si3N4 ceramic materials with excellent performance, high-quality Si3N4 powder should be prepared first. The quality of Si3N4 powder prepared by different methods is not exactly the same, which leads to the difference in its application. The failure of many ceramic materials is often attributed to Developers do not understand the differences between various ceramic powders and have insufficient knowledge of their properties.
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