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    • 21. 发明授权
    • Method and apparatus for producing titanium
    • 用于生产钛的方法和设备
    • US4964973A
    • 1990-10-23
    • US391132
    • 1989-08-08
    • Raymond J. DonahueWilliam G. HsterbergTerrance M. Cleary
    • Raymond J. DonahueWilliam G. HsterbergTerrance M. Cleary
    • C22B4/00C22B9/22C22B34/12
    • C22B4/005C22B34/1263C22B9/226
    • A method of producing titanium. A quantity of titianium is heated in a crucible to provide a melt, and a layer of slag, containing an ionizable titanium compound, such as titanium dioxide, along with ionizable slag constituents, is disposed on the top of the melt. The slag is then heated to a molten state by direct current plasma arc heating with the melt being anodic. After the slag is molten, the polarity of the plasma arc heating is reversed so that the melt is cathodic, causing the slag to act as an electron transfer layer so that the titanium dioxide of the slag is reduced to titanium and any dissolved oxygen in the melt is converted to an ionic species of oxygen at the interface between the slag and the melt. The resulting liquid titanium is combined with the melt, while the ionic species of oxygen is carried upwardly through the slag and released from the slag layer by an oxidation process. Additional quantities of titanium dioxide can be added to the slag to continually convert the titanium dioxide to titanium under the reverse polarity plasma arc heating.
    • 钛的制造方法。 将钛的量在坩埚中加热以提供熔体,并且在熔体的顶部上设置包含可电离的钛化合物(例如二氧化钛)以及可离子化的炉渣成分的炉渣层。 然后通过直接等离子体电弧加热将炉渣加热至熔融状态,熔体是阳极的。 炉渣熔化后,等离子体电弧加热的极性反转,使得熔体呈阴极,从而使炉渣作为电子转移层,从而将炉渣的二氧化钛还原为钛,并将其中的溶解氧 熔体在炉渣和熔体之间的界面转化为氧离子。 所得到的液体钛与熔体结合,而氧的离子物质向上运送通过炉渣并通过氧化过程从渣层释放。 可以向渣中加入额外量的二氧化钛,以在反极性等离子体电弧加热下将二氧化钛连续地转化为钛。
    • 22. 发明授权
    • Method and apparatus for casting of metal articles using external pressure
    • 使用外部压力铸造金属制品的方法和装置
    • US06763876B1
    • 2004-07-20
    • US10228935
    • 2002-08-27
    • Raymond J. DonahueTerrance M. ClearyParker A. Stroom
    • Raymond J. DonahueTerrance M. ClearyParker A. Stroom
    • B22C904
    • B22D18/04B22C9/046B22D21/007B22D27/13
    • A method for casting of metal articles using external pressure and having particular application to lost foam casting of metal articles. A polymeric foam pattern having a configuration corresponding to an article to be cast is placed in an outer flask and the pattern is connected through a polymeric foam gating system to a pouring cup located at the upper end of the flask. The pouring cup has a volume equal to 5% to 75% of the combined volume of the gating system and the pattern. A finely divided inert material, such as sand, is placed in the flask surrounding the pattern and fills the internal cavities within the pattern. The flask containing the pattern is then positioned in an outer pressure vessel having a removable lid and a molten metal is fed into the pouring cup. The lid on the pressure vessel is closed and an external gaseous pressure is applied to the molten metal in the pouring cup as the molten metal feeds through the gating system to the pattern and progressively decomposes the polymeric foam material. The gaseous products of decomposition passing into the interstices of the sand and the molten metal filling the void created by decomposition of the foam. By applying pressure to the molten metal during filling, the molten metal front is more stable and fewer casting defects arise.
    • 一种使用外部压力铸造金属制品并且特别适用于金属制品的失去泡沫铸造的方法。 将具有对应于待铸造制品的构造的聚合物泡沫图案放置在外部烧瓶中,并且图案通过聚合物泡沫浇口系统连接到位于烧瓶上端的浇注杯。 浇注杯的体积等于浇注系统和图案的组合体积的5%至75%。 将细碎的惰性材料(例如砂)放置在围绕图案的烧瓶中,并填充图案内的内部空腔。 然后将含有图案的烧瓶放置在具有可拆卸盖的外部压力容器中,并将熔融金属进料到浇注杯中。 当熔融金属通过浇注系统进料到图案并逐渐分解聚合物泡沫材料时,压力容器上的盖子被关闭并且外部气体压力施加到浇注杯中的熔融金属。 分解的气体产物进入砂的空隙和填充由泡沫分解产生的空隙的熔融金属。 通过在填充期间对熔融金属施加压力,熔融金属前端更稳定,并且产生更少的铸造缺陷。