Process for manufacturing a sintered structural ceramic part of aluminum nitride
    59.
    发明授权
    Process for manufacturing a sintered structural ceramic part of aluminum nitride 有权
    制造氮化铝烧结结构陶瓷部件的方法

    公开(公告)号:US06214284B1

    公开(公告)日:2001-04-10

    申请号:US09297979

    申请日:1999-05-12

    IPC分类号: C04B35582

    摘要: The invention concerns a process for manufacturing a part made of high temperature-resistant, ceramic material based on aluminum nitride and reaction sintering. The process comprises the steps of preparing a homogeneous mixture of boron nitride powder, aluminum powder and a paste-like binder, capable of solidifying by chemical reaction and by solvent loss through drying. The mixture is formed by mold casting and then pressed and heated, to a temperature not exceeding approximately 70° C., to harden the binder and to obtain a solid and manipulable unfired part. The binder is eliminated by heating to a temperature of approximately 300° C. Pores of the unfired part are impregnated by immersing the part in a bath of molten aluminum or aluminum alloy to form an impregnated preform. Thereafter, the impregnated preform is removed from the bath, cooled, and machined to the final dimensions of the part. A ceramic is obtained by reaction sintering the machined part at a temperature of 900 to 1000° C. Residual aluminum is removed from the pores of the ceramic part by heat treating it, at a temperature of 1100 to 1250° C., cooling it, and mechanically eliminating the aluminum that has collected on the surface of the part.

    摘要翻译: 本发明涉及一种制造基于氮化铝的耐高温陶瓷材料制成的部件和反应烧结的方法。 该方法包括以下步骤:制备氮化硼粉末,铝粉末和糊状粘合剂的均匀混合物,其能够通过化学反应和通过干燥的溶剂损失而固化。 混合物通过模铸而形成,然后压制和加热至不超过约70℃的温度,以使粘合剂硬化并获得固体和可操作的未烧成部分。 通过加热到约300℃的温度来消除粘合剂。通过将部分浸入熔融铝或铝合金浴中来浸渍未烧成部分的孔,以形成浸渍的预成型体。 此后,将浸渍的预制件从浴中取出,冷却并加工成零件的最终尺寸。 通过在900〜1000℃的温度下对机械加工部分进行反应烧结来获得陶瓷。通过在1100〜1250℃的温度下对其进行热处理从陶瓷部件的孔中除去残留的铝,进行冷却, 并且机械地去除已经收集在部件表面上的铝。

    High-TC superconducting ceramic oxide products and macroscopic and
microscopic methods of making the same
    60.
    发明授权
    High-TC superconducting ceramic oxide products and macroscopic and microscopic methods of making the same 失效
    高温超导陶瓷氧化物产品及其制备方法及其微观方法

    公开(公告)号:US5219832A

    公开(公告)日:1993-06-15

    申请号:US716929

    申请日:1991-06-18

    申请人: Dawei Zhou

    发明人: Dawei Zhou

    摘要: High-Tc superconducting ceramic oxide products and macroscopic and microscopic methods for making such high-Tc superconducting products. Completely sealed high-Tc superconducting ceramic oxide products are made by a macroscopic process including the steps of pressing a superconducting ceramic oxide powder into a hollow body of a material inert to oxygen; heat treating the superconducting ceramic oxide powder packed body under conditions sufficient to sinter the ceramic oxide powder; and then sealing any openings of the body. Optionally, a waveform or multiple pulses of alternate magnetic field can be applied during the heat treatment. The microscopic method of producing a high-Tc superconducting ceramic oxide product includes the steps of making a high-Tc superconducting ceramic oxide thin film; optionally sintering the deposited thin film in a magnetic field; and removing partial oxygen content of the thin film by a scanning tunneling electron treatment machine to form a microscopic insulation layer between two high-Tc superconducting domains of the thin film.

    摘要翻译: 高Tc超导陶瓷氧化物产品以及制造这种高Tc超导产品的宏观和微观方法。 完全密封的高Tc超导陶瓷氧化物产品通过宏观方法制造,包括将超导陶瓷氧化物粉末压制成对氧惰性的材料的中空体; 在足以烧结陶瓷氧化物粉末的条件下热处理超导陶瓷氧化物粉末包装体; 然后密封身体的任何开口。 可选地,可以在热处理期间施加交替磁场的波形或多个脉冲。 制造高Tc超导陶瓷氧化物产品的微观方法包括制备高Tc超导陶瓷氧化物薄膜的步骤; 可选地在磁场中烧结沉积的薄膜; 并通过扫描隧道电子处理机去除薄膜的部分氧含量,以在薄膜的两个高Tc超导畴之间形成微观绝缘层。