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    • 86. 发明公开
    • Method of pretreating metallic works and method of nitriding steel
    • 一种用于金属工件的预处理和钢的氮化处理。
    • EP0408168A1
    • 1991-01-16
    • EP90302232.5
    • 1990-03-01
    • DAIDOUSANSO CO., LTD.
    • Tahara, MasaakiTomoda, TakakazuKitano, KenzoMinato, Teruo
    • C23C8/02C23C8/24
    • C23C8/34C23C8/02
    • A method of pretreating metallic works comprises beating a metallic work in a furnace and introducing a fluorine- or fluoride-­containing gas into the furnace in thta state to thereby cause destruction and elimination of the foreign matters adhering to the metallic work surface and of the oxidized layer occurring on the metallic work surface and simultaneous formation of a fluorinated layer. Just prior to the main thermal treatment, for example nitriding, the fluorinated layer is decomposed and eliminated by introducing an appropriate gas, for example H₂, into the furnace. In this way, the metallic work reveals its cleaned and activated surface.
      A steel nitriding method comprises heating a steel work placed in a furnace to a temperature of about 300-500 o C, feeding a fluorine- or fluoride-containing gas into the furnace at that temperature, and then subjecting the steel works to nitriding treatment to thereby remove impurities and at the same time activate a steel work surface, make N atoms penetrate rapidly to the thus-­activated steel work surface and diffuse into the inside. As a result, a uniform nitrided layer can be formed.
    • 预处理金属的方法的工作原理包括跳动在炉中的金属的工作和引入含氟或含氟化物的气体进入炉中thta状态,从而使异物秉承金属工作台面和氧化的破坏和消除 在金属工作台面和氟化层的同时形成发生层。 就在主热处理,氮化对于实施例之前,氟化层被分解,并通过在适当的气体引入,例如H2,入炉消除。 通过这种方式,金属工作揭示了其清洁和活化表面。 的钢渗氮方法,包括加热在炉中放置约300-500nm的温度的钢结构 C,在该温度下进给含氟或含氟化物的气体到炉中并,然后使钢工作以氮化 处理,从而除去杂质,并在同一时间激活一个钢工作台面,使N原子渗入迅速向由此活化的钢工作台面和扩散到内部。 其结果是,均匀的氮化层,可以形成。
    • 88. 发明授权
    • APPARATUS FOR PRODUCING HIGH-PURITY NITROGEN GAS
    • 用于生产高纯度氮气的装置
    • EP0175791B1
    • 1988-11-09
    • EP84901401.4
    • 1984-03-29
    • DAIDOUSANSO CO., LTD.
    • YOSINO, Akira 30-13, Nisiyamadai 2-chome
    • F25J3/04
    • F25J3/044F17C9/04F17C2201/0109F17C2203/0391F17C2221/011F17C2221/014F17C2221/031F17C2223/0123F17C2223/0161F17C2270/0518F25J3/0426F25J3/04636F25J3/04824F25J2200/74F25J2205/60F25J2210/42F25J2245/42F25J2250/42F25J2290/10F25J2290/62Y10S62/908Y10S62/913
    • This apparatus produces ultra-high purity nitrogen gas employed in fields such as the electronics industry when manufacturing a silicon semiconductor, for example. Conventional cryogenic liquefaction and PSA nitrogen gas production apparatuses often break down, and the nitrogen gas obtained by these conventional apparatuses is expensive, but its purity is not particularly high. In the apparatus of the present invention, a liquid nitrogen storage means (23) is connected to heat exchange means (13), (14) by an inlet path (16), and compressed air arriving at the heat exchanger means (13), (14) through an air compression means (9) and an elimination means (12) is cooled to an ultra-low temperature by the heat of evaporation of liquid nitrogen, and is pumped into a fractionating tower (15) from which nitrogen is taken out in a gaseous state leaving oxygen as a liquid, making use of the difference in boiling points therebetween. The obtained nitrogen gas is mixed with vaporized liquid nitrogen from the liquid nitrogen storage means (23) to obtain the final nitrogen gas. This makes it possible to produce inexpensive, high-purity nitrogen gas, with little likelihood of mechanical failure.
    • 例如,该设备在制造硅半导体时生产用于电子工业等领域的超高纯氮气。 常规的低温液化和PSA氮气生产设备经常分解,并且由这些常规设备获得的氮气昂贵,但其纯度不是特别高。 在本发明的设备中,液氮储存装置(23)通过入口通道(16)连接到热交换装置(13),(14),并且到达热交换器装置(13)的压缩空气, 通过空气压缩装置(9)将空气压缩机(14)和消除装置(12)通过液氮的蒸发热冷却至超低温,并且将其泵入分馏塔(15)中,从其中取出氮气 利用它们之间的沸点差异以气态离开氧气作为液体。 将得到的氮气与来自液氮贮存装置(23)的汽化液氮混合,得到最终的氮气。 这使得制造廉价,高纯度的氮气成为可能,而机械故障的可能性很小。
    • 90. 发明公开
    • OXYGEN GAS PRODUCTION UNIT
    • 氧气生产装置
    • EP0235295A1
    • 1987-09-09
    • EP86904929.6
    • 1986-08-08
    • DAIDOUSANSO CO., LTD.
    • YOSHINO, Akira 30-13, Nisiyamadai 2-chome
    • F25J3/04
    • F25J3/0483F25J3/0409F25J3/04254F25J3/04309F25J3/04412F25J3/04824F25J3/04866F25J2210/50F25J2235/50F25J2250/50F25J2250/52F25J2290/62Y10S62/913
    • A unit for producing an oxygen gas of a superhigh purity by deep freezing of the air, and an object of the present invention is to obtain a unit which is capable of dealing with sudden variations in the demand for an oxygen gas, by using both an expansion turbine and a liquid oxygen storage means as the refrigerating source. In this unit, a liquid oxygen storage means (23) is connected to an upper portion (14) of a rectifier, provided with a condenser (17) therein, via an introduction passage (23a) so as to cool said condenser with a liquid oxygen, and a lower portion (15) of the rectifier and an expansion turbine (31) for cooling a heat exchanger (7) are connected by an introduction passage (29). The raw compressed air is cooled to a super-low temperature in the heat exchanger, and then fed to the lower portion of the rectifier, in which the resultant air is further cooled with the latent heat of vaporization of a refluxing liquid nitrogen obtained in the condenser, to obtain liquid air having a higher oxygen content. This liquid air is introduced into the upper portion of the rectifier to separate a liquid containing oxygen alone from the liquid air, by utilizing a boiling point difference, and the remainder is discharged to the outside as waste nitrogen. The liquid oxygen is taken out through a conduit (32), and then gasified and taken out as a product oxygen gas through a conduit (35).
    • 一种用于通过空气的深度冷冻来生产超高纯度氧气的单元,并且本发明的一个目的是获得一种能够应对氧气需求的突然变化的单元,其通过使用 膨胀涡轮和液氧储存装置作为制冷源。 在该装置中,液态氧储存装置(23)通过引入通道(23a)连接到装有冷凝器(17)的精馏器的上部(14),以便用液体冷却所述冷凝器 氧气和精馏器的下部(15)以及用于冷却热交换器(7)的膨胀涡轮(31)通过引入通道(29)连接。 原始压缩空气在热交换器中被冷却至超低温,然后被供给到精馏器的下部,在精馏器的下部,所得到的空气被进一步冷却,同时得到的回流液氮的汽化潜热 冷凝器,以获得具有较高氧含量的液体空气。 该液态空气被导入精馏塔的上部,利用沸点差将含有氧的液体与液体空气分离,剩余部分作为废氮排出到外部。 液氧通过导管(32)排出,然后气化并作为产品氧气通过导管(35)排出。