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Development trend of advanced composite high temperature thermal equipment
2023-10-27The so-called composite material refers to a multiphase new material system prepared by two or more component materials using a certain process technology, and its comprehensive performance is better than the respective component materials. Advanced composite material refers to the composite material composed of high performance reinforcement such as carbon fiber, aramong and other high performance heat resistant polymers, including metal base, ceramic base and carbon (graphite) base and functional composite material. Each component material of composite material plays a synergistic role in performance. Compared with traditional materials, it has high specific strength, light weight, high specific modulus and good fatigue resistance. And good vibration damping performance and many other advantages, widely used in the national defense industry, aerospace, automobile manufacturing and other fields.
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Recent progress and challenges of transparent AlON ceramics
2023-05-10Ceramics and their composites have been widely investigated for various applications due to their unique chemical and physics properties [1−7]. Among them, transparent ceramics have an extensive application in the business domain and the military industries due to their outstanding optical, physical, and mechanical properties [8−10]. Among the transparent ceramics, transparent aluminum oxynitride (AlON) ceramics have been considered as one of the most important ceramics in the domes, infrared and visible windows, and transparent armors, etc [11−13]. Compared with the single crystal sapphire, which is well-known as the hardest transparent ceramics, the polycrystalline AlON ceramics have similar characteristics on strength, hardness, and optical properties, but offer more flexibility in size and shape [14,15]. Therefore, AlON ceramics have attracted a growing investigation. γ-AlON is a solid solution of Al2O3and AlN [16,17]. Many methods have been explored to prepare AlON powder or AlON ceramics, such as solid-state reaction [18], carbonization method for Al2O3[19,20], chemical vapor deposition [21], sol−gel method [22,23], and solution combustion synthesis [24]. The band gap of AlON was measured to be 6.2 eV [25]. TU et al [26] employed a first-principles density functional theory (DFT) to study the on-site preference of Al vacancy and Natoms in γ-AlON. The band gap and bulk modulus structural model of γ-AlON, as the local structure of the Al23O27N5were calculated to be 3.99 eV of N atoms and Al vacancies in γ-AlON is not and 200.9 GPa, respectively. Given a wide band clear. The properties of γ-AlON are displayed in gap together with low photon energy and high Table 1 [14].
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One article to understand the vacuum high pressure gas quenching furnace
2022-08-29Vacuum high pressure gas quenching refers to tool steel, high-speed steel and alloy steel that are easily hardenable materials. After being loaded into the vacuum furnace to reach the vacuum degree specified by the process, it is heated to the critical temperature Ac3 or Ac1 or above, and kept warm according to the process requirements.
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One article to understand vacuum brazing technology and application
2022-08-15Vacuum brazing technology is widely used in the manufacture of honeycomb sandwich structure panels, assemblies of jet engines and rocket missile devices, metal filters, waveguides and various radiators.
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A picture to understand the vacuum hot pressing furnace
2022-07-29A process in which material forming and sintering are completed at the same time by applying pressure to loose powder placed in a mold of defined shape or heating a powder compact in a vacuum environment.
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A picture to understand the vacuum diffusion welding furnace
2022-07-14Vacuum Diffusion Welding refers to a welding method in which the closely attached components are kept at a certain temperature and pressure for a period of time in a vacuum environment, so that the atoms between the contact surfaces diffuse each other to form a connection.
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