公开(公告)号：US5114911A

公开(公告)日：1992-05-19

申请号：US658055

申请日：1991-02-20

Applicant: Cheng-Yie Shei ,  Weir-Mirn Hurng ,  Chau-Ting Chang

Inventor： Cheng-Yie Shei ,  Weir-Mirn Hurng ,  Chau-Ting Chang

IPC: C01G3/00

CPC classification number: C01G3/006 ,  C01P2002/70 ,  C01P2002/72 ,  C01P2002/76 ,  C01P2004/01 ,  C01P2004/03 ,  C01P2006/42 ,  Y10S505/737 ,  Y10S505/738

Abstract: An oxalate route coprecipitation process for preparing a superconducting YBaCuO system precursor powder comprises preparing an aqueous solution of nitrates of yttrium, barium and copper, which is then mixed with an organic solution containing a dibasic oxalate ester, an organic base and acetone. An ultrasound vibration is applied to the mixture to coprecipitate oxalates of yttrium, barium and copper. The decomposition of the oxalate ester is enhanced to an optimum rate as the result of the homogeneous phase contributed by acetone which is miscible with both water and the oxalate ester. The ultrasound vibration segregates the precipitate particles thereby preventing the coagulation of the particles and assuring fine and uniform particle size.

Abstract translation: 用于制备超导YBaCuO系统前体粉末的草酸盐路线共沉淀法包括制备钇，钡和铜的硝酸盐水溶液，然后将其与含有草酸二碱酯，有机碱和丙酮的有机溶液混合。 将超声波振动施加到混合物以共沉淀钇，钡和铜的草酸盐。 草酸酯的分解作为由丙酮贡献的均相的结果提高到最佳速率，丙酮与水和草酸酯都可混溶。 超声波振动使沉淀颗粒分离，从而防止颗粒的凝结，并确保微细且均匀的粒径。

公开(公告)号：US5147848A

公开(公告)日：1992-09-15

申请号：US551629

申请日：1990-07-11

Applicant: Chau-Ting Chang ,  Cheng-Yei Shei ,  Ru-Shi Liu

Inventor： Chau-Ting Chang ,  Cheng-Yei Shei ,  Ru-Shi Liu

IPC: C01G29/00 ,  H01L39/24

CPC classification number: C01G29/006 ,  H01L39/2477 ,  C01P2002/72 ,  C01P2002/82 ,  C01P2002/88 ,  C01P2006/32 ,  C01P2006/40 ,  C01P2006/42 ,  Y10S505/737 ,  Y10S505/738 ,  Y10S505/782

Abstract: A process for preparing powder of high temperature oxide superconductors of Bi-Pb-Sr-Ca-Cu-O type. In an aqueous solution of nitrate salts of Bi, Pb, Sr, Ca, and Cu metals, an appropriate ratio of triethylamine/oxalic acid was added to form a coprecipitate. Through the process of calcination at a temperature in the range of 750.degree. C. to 800.degree. C. and sintering at a temperature of 860.degree. C., a uniform and fine powder superconductive metal oxide having a critical temperature of 110K is obtained as the final product.

Abstract translation: 一种制备Bi-Pb-Sr-Ca-Cu-O型高温氧化物超导体粉末的方法。 在Bi，Pb，Sr，Ca和Cu金属的硝酸盐水溶液中，加入适量的三乙胺/草酸，形成共沉淀物。 通过在750℃〜800℃的温度下煅烧并在860℃的温度下烧结，得到临界温度为110K的均匀且细粉末的超导金属氧化物，作为 完成品。

公开(公告)号：US4338125A

公开(公告)日：1982-07-06

申请号：US70417

申请日：1979-08-28

Applicant: Chau-Ting Chang

Inventor： Chau-Ting Chang

IPC: C22B11/10 ,  C22B60/02 ,  C25C1/00

CPC classification number: C22B60/0213 ,  C22B11/10 ,  C22B60/0278 ,  C25C1/00

Abstract: The preparation of nuclear fuels such as uranium dioxide, carbide and nitride employing the ammonium urante, (NH.sub.4).sub.2 U.sub.2 O.sub.7, as starting material usually must undergo a series of chemical and metallurgical processes at relatively high temperature and under strictly controlled working condition.A simple method for the preparation of these nuclear fuels has evolved with respect to the electrolytic amalgamation of uranium ion directly from an aqueous solution. The thereby obtained uranium amalgam maybe thermally decomposed into a fine metallic powder which reacts readily with water vapor, methane and nitrogen gas to bring forth uranium dioxide, carbide and nitride, respectively.

Abstract translation: 使用氨化铵（NH4）2U2O7作为起始原料的核燃料如二氧化铀，碳化物和氮化物的制备通常必须在较高温度和严格控制的工作条件下进行一系列化学和冶金过程。 关于直接从水溶液中的铀离子的电解汞合金，已经演变了用于制备这些核燃料的简单方法。 由此得到的铀汞合金可能热分解成与水蒸气，甲烷和氮气容易反应的细金属粉末，分别引出二氧化铀，碳化物和氮化物。

公开(公告)号：US4895832A

公开(公告)日：1990-01-23

申请号：US266786

申请日：1988-11-03

Applicant: Chau-Ting Chang ,  Ru-Shi Liu

Inventor： Chau-Ting Chang ,  Ru-Shi Liu

IPC: C01G3/00

CPC classification number: C01G3/006 ,  C01P2002/34 ,  C01P2002/72 ,  C01P2002/82 ,  C01P2004/62 ,  C01P2006/12 ,  C01P2006/42 ,  Y10S502/525 ,  Y10S505/737 ,  Y10S505/738 ,  Y10S505/78

Abstract: A homogenous coprecipitation method by which superconducting oxides having perovskite-like structure, such as YBa2Cu307-x, can be produced in mass, in which urea is used as solvent to adjust and control the PH value of an aqueous nitrate solution. The coprecipitation method of this invention comprises following steps: (a) preparing an aqueous mixture containing Y, Ba and Cu salts with molar ratio of 1:2:3 wherein Y being 0.068M; (b) adding 5-10 moles of oxalic acid per one mole of Y and 20-250 moles of urea per moles of Y into the aqueous mixture; (c) heating the aqueous mixture to a temperature range of 80.degree. to 100.degree. C. to proceed a hydrolysis of the urea such that PH value of the aqueous mixture will be gradually elevated by NH.sub.3 gas evoluted from the urea hydrolysis; and (d) cooling the temperature of the aqueous mixture to room temperature at which time a desired uniform PH value is reached. After cooling, pale blue homogeneous coprecipitates of the superconducting oxides can be obtained.

Abstract translation: 可以大量生产具有钙钛矿型结构的超导氧化物如YBa2Cu307-x的均匀共沉淀法，其中使用尿素作为溶剂来调节和控制硝酸水溶液的PH值。 本发明的共沉淀方法包括以下步骤：（a）制备含有Y，Ba和Cu盐的含水混合物，其摩尔比为1:2:3，其中Y为0.068M; （b）每摩尔Y加入5-10摩尔草酸，每摩尔Y加入20-250摩尔尿素至含水混合物中; （c）将含水混合物加热到80℃至100℃的温度范围，以进行尿素的水解，使得由尿素水解产生的NH 3气体逐渐升高含水混合物的PH值; 和（d）将含水混合物的温度冷却至室温，此时达到所需的均匀PH值。 冷却后，可以得到超蓝色均匀的超导氧化物的共沉淀物。

公开(公告)号：US4004987A

公开(公告)日：1977-01-25

申请号：US514479

申请日：1974-10-15

Applicant: Chau-Ting Chang

Inventor： Chau-Ting Chang

IPC: C22B11/10 ,  C22B60/02 ,  C25C1/00 ,  C25C5/02

CPC classification number: C25C1/00 ,  C22B11/10 ,  C22B60/0213 ,  C22B60/0278

Abstract: Metal amalgams are prepared electrolytically by using an ion exchange membrane for the purpose of adjusting pH during the course of electrolysis. The subsequent thermal decomposition of the thereby obtained amalgam under reduced pressure brings forth metallic powder and solid metal.

Abstract translation: 为了在电解过程中调节pH，使用离子交换膜电解制备金属汞齐。 由此得到的汞齐在减压下进行热分解，得到金属粉末和固体金属。