Our metals for vacuum evaporation.

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  • Our metals for vacuum evaporation.

    Precio : Gratis

    Publicado por : dnfsdd810

    Publicado en : 21-10-21

    Ubicación : Albacete

    Visitas : 5



    Our metals for vacuum evaporation.

    We supply vaporation Boat

    s manufactured from tungsten, molybdenum, molybdenum-lanthanum (ML), molybdenum-

    yttrium oxide (MY) or tantalum. Our evaporation boats offer a good level of electrical

    conductivity and possess low vapor pressures combined with a very high melting point. When

    powered on, our boats heat the material for evaporation. During this process, the low vapor

    pressures of our metals ensure that no tungsten, tantalum or molybdenum particles enter the

    vapor and penetrate the subsequent layer.
            Which boat is right for your coating material?
     
            Which boat type fits which coating material? You can find an overview of our

    evaporation boats and coating materials here. Of course, we are also happy to help you

    individually with your material choice.
        Boron Nitride Ceramics are advanced synthetic ceramic materials available

    in solid and powder form. Its unique properties – from high heat capacity and outstanding

    thermal conductivity to easy machinability, lubricity, low dielectric constant and superior

    dielectric strength – make boron nitride a truly outstanding material.
        In its solid form,

    Hexagonal Boron Nitride
    is often referred to as “white graphite” because it has a

    microstructure similar to that of graphite. However, unlike graphite, boron nitride is an

    excellent electrical insulator that has a higher oxidation temperature. It offers high

    thermal conductivity and good thermal shock resistance and can be easily machined to close

    tolerances in virtually any shape. After machining, it is ready for use without additional

    heat treating or firing operations.
        To make solid shapes, Hexagonal Boron Nitride Powders and binders

    are hot-pressed in billets up to 490mm x 490mm x 410mm at pressures up to 2000 psi and

    temperatures up to 2000°C. This process forms a material that is dense and easily machined

    and ready to use. It is available in virtually any custom shape that can be machined and

    has unique characteristics and physical properties which make it valuable for solving tough

    problems in a wide range of industrial applications.
        Boron Nitride Coating is one of the few materials that offers electrical

    insulation and high thermal conductivity. This makes BN extremely useful in high power

    electronic applications in heat sink and heat spreader applications. Other materials that

    are commonly used are Aluminum Nitride, beryllium oxide, and sometimes Alumina – however,

    all of these materials are significantly more difficult to machine into intricate shapes.
        Why is Cubic Boron

    Nitride
    called a superhard material? If you are looking for the answer to this

    question, then you've come to the right place. In this article, we will take a closer

    look at the cubic boron nitride and try to answer why cubic boron nitride is called a

    superhard material.
        Cubic boron nitride (CBN) is a super hard material synthesized by hexagonal boron

    nitride and catalyst under high temperature and pressure. The hardness of this superhard

    material is second only to diamond in industrial application. The thermal stability of



    Cubic Boron Nitride Powder
    is much higher than that of diamond, and it has greater

    chemical stability for iron series metal elements. Therefore, the cubic boron nitride

    grinding tool has been widely used in the cutting and grinding fields of iron fund products

    with excellent performance.
        There are two kinds of cubic boron nitride: single crystal and polycrystalline sintered

    body. The single crystal is obtained by controlling the hexagonal boron nitride and

    catalyst in pressure in 3000 ~ 8000 Mpa and the temperature in 800 ~ 1900 ℃. Typical

    catalyst materials are selected from alkali metals, alkali earth metals, tin, lead,

    antimony, and their nitrides. The crystalline form of cubic boron nitride has the truncated

    cone of tetrahedron, octahedron, skew crystal and twin crystal, etc. Commercially produced

    cubic boron nitride is black, amber, and gold-plated with particles usually less than 1 mm

    in size.
        Application of Boron Nitride Polycrystal in Metal Cutting Field
        Cubic Boron Nitride Cutting Tools are a kind of superhard material

    product that are formed by the coalescence of many fine grains (0.1~100 micron) CBN. In

    addition to high hardness and abrasion resistance, it also has the characteristics of high

    toughness, chemical inertness, red hardness, etc., and can be polished with the cutting

    edge of the diamond grinding wheel. It shows excellent cutting performance in all aspects

    of machining and can achieve stable cutting at high temperatures, so it is especially

    suitable for machining all kinds of hardened steel, tool steel, chilled cast iron, and

    other hard-working materials with high hardness.
        PCBN has most of the properties of CBN, and overcomes the disadvantages of directional

    cleavage of CBN single crystal surface, and has many performance advantages.


       

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