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    • 10. 发明授权
    • Boron nitride insulating material
    • 氮化硼绝缘材料
    • US4106186A
    • 1978-08-15
    • US744494
    • 1976-11-24
    • Chester S. Morgan, Jr.O. Burl CavinReginald W. McCullochDavid L. Clark
    • Chester S. Morgan, Jr.O. Burl CavinReginald W. McCullochDavid L. Clark
    • H01C1/03H01C3/20H05B3/48
    • G21C17/001G21C17/06G21C21/02H01C1/03H01C3/20H05B3/48Y10T29/49092
    • High temperature BN-insulated heaters for use as fuel pin simulators in reactor thermal hydraulic test facility studies comprise a cylindrical housing and a concentric heating element disposed within the housing and spaced apart from the housing to define an annular region therebetween. The annular region contains BN for providing electrical resistance and thermal conductivity between the housing and the heating element. The fabrication method of this invention comprises the steps of cold pressing BN powder at a pressure of 20 to 80,000 psig and a dwell time of at least 0.1-3 seconds to provide hollow cylindrical preforms of suitable dimensions for insertion into the annular region, the BN powder having a tap density of about 0.6-1.1 g/cm.sup.3 and an orientation ratio of at least about 100/3.5. The preforms are inserted into the annular region and crushed in place.
    • 用作反应堆热液压试验设备研究中的燃料引脚模拟器的高温BN绝缘加热器包括设置在壳体内的圆柱形壳体和同心加热元件,并与壳体间隔开以在其间限定环形区域。 环形区域包含BN,用于在外壳和加热元件之间提供电阻和导热性。 本发明的制造方法包括以下步骤:压制压力为20-80,000psig的BN粉末和至少0.1-3秒的停留时间,以提供用于插入环形区域的合适尺寸的中空圆柱形预成型件,BN 具有约0.6-1.1g / cm 3的振实密度和至少约100 / 3.5的取向比的粉末。 将预成型件插入环形区域并将其压碎就位。