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    • 11. 发明授权
    • Process for removal of sand mold residues from cast parts
    • 从铸件中除去砂模残渣的工艺
    • US4441930A
    • 1984-04-10
    • US217094
    • 1980-12-16
    • Ulrich BaudisPeter BiberbachWolfgang Weber
    • Ulrich BaudisPeter BiberbachWolfgang Weber
    • B22D29/00B22D31/00C23G1/28C03C23/00
    • B22D31/002B22D29/002C23G1/28
    • For removing and dissolving sand mold residues from cast parts, particularly sand mold residues containing zirconium oxide and titanium oxide, there have previously been used mechanical and electrochemical processes in salt melts. However, these processes are very expensive, attack the surface of the cast pieces or fail to work with sand mold constituents which are difficult to dissolve. These disadvantages are avoided by inserting the cast parts having adhering sand mold residues into a melt of 55 to 97 weight % of alkali metal hydroxide and 3 to 45 weight % of one or more fluorides of an element of the first to third main group of the periodic system of elements and/or zinc at 400.degree. to 900.degree. C. Preferably the salt melt additionally contains a boron-oxygen and/or a boron-fluorine compound.
    • 为了从铸件中除去和溶解砂模残渣,特别是含有氧化锆和氧化钛的砂模残渣,以前已经在盐熔体中使用机械和电化学方法。 然而,这些方法非常昂贵,侵蚀铸件的表面或者不能与难以溶解的砂模成分一起使用。 通过将具有粘附的砂模残余物的铸造件插入55至97重量%的碱金属氢氧化物和3至45重量%的第一至第三主要元素的一种或多种氟化物的熔体中来避免这些缺点 在400〜900℃下元素和/或锌的周期性体系。优选地,盐熔体还含有硼 - 氧和/或硼 - 氟化合物。
    • 15. 发明授权
    • Platinum/ruthenium catalyst for direct methanol fuel cells
    • 用于直接甲醇燃料电池的铂/钌催化剂
    • US07776781B2
    • 2010-08-17
    • US11573936
    • 2005-08-13
    • Marco LopezPeter Biberbach
    • Marco LopezPeter Biberbach
    • B01J21/18B01J23/40B01J23/74B01J23/00B01J23/42B01J23/44H01M4/02H01M4/58C22C5/04
    • H01M4/921
    • The invention relates to a carbon-supported PtRu anode catalyst for direct methanol fuel cells (DMFC) which has a platinum/ruthenium content in the range from 80 to 98 wt. %, preferably in the range from 85 to 98 wt. %, particularly preferably in the range from 85 to 95 wt. % (based on the total weight of the catalyst), on a carbon-based electrically conductive support material and has a mean particle size of less than 3 nm. The catalyst is prepared using a carbon black support material having a specific surface area (measured by the BET method) in the range from 1000 to 2000 m2/g by means of a reduction process using chemical reducing agents with addition of organic acids. Electrodes and membrane-electrode units containing the catalyst according to the invention having a high precious metal loading have an electrode layer thickness of less than 80 μm at a PtRu loading per unit area of the electrode of from 6 to 12 mg of PtRu/cm2 and lead to improved electric power in direct methanol fuel cells.
    • 本发明涉及一种用于直接甲醇燃料电池(DMFC)的碳负载PtRu阳极催化剂,其具有80至98重量%的铂/钌含量。 %,优选在85至98重量%的范围内。 %,特别优选为85〜95重量%。 %(基于催化剂的总重量),在碳基导电载体材料上,并且具有小于3nm的平均粒度。 使用具有通过添加有机酸的化学还原剂的还原方法,使用具有1000-2000m 2 / g的比表面积(通过BET法测量)的炭黑载体材料制备催化剂。 含有贵金属负载量高的本发明催化剂的电极和膜 - 电极单元,PtRu负载量为6〜12mg PtRu / cm 2时Pt电极厚度小于80μm, 导致直接甲醇燃料电池的电力提高。
    • 16. 发明授权
    • Platinum and platinum alloy powders with high surface areas and low chlorine content and processes for preparing these powders
    • 具有高表面积和低氯含量的铂和铂合金粉末以及用于制备这些粉末的方法
    • US06814777B2
    • 2004-11-09
    • US10209084
    • 2002-07-31
    • Peter Biberbach
    • Peter Biberbach
    • B22F100
    • H01M4/92B22F9/24B22F2998/00C22B11/02H01M4/8605H01M8/1004Y02P70/56B22F1/0018
    • The invention provides platinum or platinum alloy powders for use in fuel cells and for chemical reactions. The powders are characterized by a high surface area and, at the same time, low chlorine contents. The powders are prepared by forming a melt which contains, as starting substances, a low melting mixture of alkali metal nitrates, a chlorine-free platinum compound and optionally chlorine-free compounds of alloying elements, the melt is then heated to a reaction temperature at which the platinum compound and the compounds of alloying elements thermally decompose to give oxides, the melt is then cooled and dissolved in water and the oxides or mixed oxides formed are converted into platinum or platinum alloy powders by subsequent reduction. Binary or ternary eutectic mixtures from the LiNO3—KNO3—NaNO3 system are suitable as a low melting mixture of nitrates of the alkali metals. Hexahydroxoplatinic-(IV)-acid is preferably used as a chlorine-free platinum compound.
    • 本发明提供用于燃料电池和化学反应的铂或铂合金粉末。 粉末的特征在于表面积高,同时氯含量低。 通过形成熔融物制备粉末,该熔体含有作为起始物质的碱金属硝酸盐,无氯铂化合物和任选的不含氯的合金元素化合物的低熔点混合物,然后将熔体加热至反应温度 其中铂化合物和合金元素的化合物热分解产生氧化物,然后将熔体冷却并溶解在水中,形成的氧化物或混合氧化物通过随后的还原转化为铂或铂合金粉末。 来自LiNO3-KNO3-NaNO3体系的二元或三元共晶混合物适合作为碱金属硝酸盐的低熔点混合物。 六羟基铂(IV) - 酸优选用作无氯铂化合物。