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    MANUFACTURE OF GRANULATED MATERIAL
    1.
    发明专利
    MANUFACTURE OF GRANULATED MATERIAL 失效

    公开(公告)号：JPH1036901A

    公开(公告)日：1998-02-10

    申请号：JP8781397

    申请日：1997-04-07

    Applicant: BASF AG

    Inventor： HESSE WERNER DR ,  BITTLER KNUT DR

    IPC: B01J2/20 ,  B22F1/00 ,  B22F3/02 ,  B22F3/10 ,  B22F3/22 ,  C22C1/05

    Abstract: PROBLEM TO BE SOLVED: To obtain a good injection molding material without executing a preliminary mixing between a hard material phase and metal powders by specifying the viscosity of a binder. SOLUTION: At least one kind of the hard material phase is mixed with the metal powders and the binder to form granulated powders. At this time, the preliminary mixing between the hard material phase and the metal powders is not executed before the hard material is mixed with the binder. The binder has a viscosity of 20 to 200cm /10min. at 195 deg.C and under a load of 2.16kg by the DIN standard. Mixing with the organic binder having such a high viscosity brings a high shearing force into a mixture and, as a result, flocculation of the hard material phase or metallic component particles is dispersed or cannot be generated. Therefore, the components inside the granulated material are uniformly distributed, which is reflected to the characteristic corresponding to a produced molded member. Thus, also the flow characteristic of the granulated material during the injection molding is improved, thus the molding of complicated members is facilitated, thereby shortening the binder removing time, too.

    PRODUCTION OF POWDERY ZIRCONIUM DIOXIDE
    2.
    发明专利
    PRODUCTION OF POWDERY ZIRCONIUM DIOXIDE 失效

    公开(公告)号：JPH10114522A

    公开(公告)日：1998-05-06

    申请号：JP12439697

    申请日：1997-05-14

    Applicant: BASF AG

    Inventor： STERZEL HANS-JOSEF DR ,  HESSE WERNER DR

    IPC: C01G25/02

    Abstract: PROBLEM TO BE SOLVED: To obtain chloride-free zirconium dioxide powder without passing through a complex mechanical treating process by producing powdery zirconium dioxide from a soln. prepd. by dissolving a chloride-free zirconium compd. in a formic acidwater mixture. SOLUTION: A chloride-free zirconium compd. such as zirconium oxide hydrate or basic zirconium carbonate is dissolved in a formic acid-water mixture. The molar ratio between the formic acid and water is usually l:1 to 1:3 and the dissolution temp. is 50-90 deg.C. Evaporable components are removed from the resultant soln. advantageously by spray-drying the soln. and the remaining solid is fired to form zirconium dioxide. An additive stabilizing the tetragonal transformation of ZrO2 . as an end product to change to monoclinic transformation or a precursor of the additive may be added at any time.

    3.
    发明专利
    未知

    公开(公告)号：DE19700528A1

    公开(公告)日：1998-07-16

    申请号：DE19700528

    申请日：1997-01-09

    Applicant: BASF AG

    Inventor： HESSE WERNER DR

    IPC: C04B35/56 ,  C04B35/563 ,  C04B35/58 ,  C04B35/583 ,  C08K3/10 ,  A44C27/00 ,  C08J3/12 ,  C08K3/14 ,  C08K3/22 ,  C08K13/04 ,  C08L59/00

    Abstract: The invention concerns a moulding compound which comprises: (a) an organic binder whose portion, relative to the total volume of the moulding compound, is between 30 and 70 vol %, as component A; (b) at least one nitride, carbonitride or carbide of at least one transition metal or of boron as component B; and (c) at least one oxide of aluminium, zirconium, yttrium, cerium or magnesium as component C; components B and C being dispersed in component A. The moulding compound is suitable for producing ceramic (injection-moulded) bodies having a metallic appearance.

    5.
    发明专利
    未知

    公开(公告)号：DE19619638A1

    公开(公告)日：1997-11-20

    申请号：DE19619638

    申请日：1996-05-15

    Applicant: BASF AG

    Inventor： STERZEL HANS-JOSEF DR ,  HESSE WERNER DR

    IPC: C01G25/02

    Abstract: ZrO2 powder is produced by dissolving a chlorine-free zirconium compound in formic acid, removing the volatile components and calcining the residue. The powder can then be produced from this material using a known method such as spray drying.

    Process for preparing anhydrous sodium dithionite
    6.
    发明专利
    Process for preparing anhydrous sodium dithionite 未知

    公开(公告)号：DE4437253A1

    公开(公告)日：1995-05-04

    申请号：DE4437253

    申请日：1994-10-18

    Applicant: BASF AG

    Inventor： BITTERLICH STEFAN DR ,  HESSE WERNER DR ,  LEUTNER BERND DR ,  WOSTBROCK KARL-HEINZ DR

    IPC: C01B17/66

    Abstract: Preparation of anhydrous sodium dithionite by reacting sodium formate, sulphur dioxide and an alkaline sodium compound in aqueous-methanolic solution in a first stage, separating the precipitated product from the mother liquor, lowering the sodium thiosulphate content in the mother liquor and recycling the resulting solution to the first stage, by a) withdrawing from the mother liquor from 10 to 60% by weight of the water present therein and b) cooling the remaining solution to a temperature between -40 and 10 DEG C and separating off the precipitate thus formed.

    7.
    发明专利
    未知

    公开(公告)号：ES2164955T3

    公开(公告)日：2002-03-01

    申请号：ES97107490

    申请日：1997-05-07

    Applicant: BASF AG

    Inventor： STERZEL HANS-JOSEF DR ,  HESSE WERNER DR

    IPC: C01G25/02

    Abstract: ZrO2 powder is produced by dissolving a chlorine-free zirconium compound in formic acid, removing the volatile components and calcining the residue. The powder can then be produced from this material using a known method such as spray drying.

    8.
    发明专利
    未知

    公开(公告)号：DE19614006A1

    公开(公告)日：1997-10-16

    申请号：DE19614006

    申请日：1996-04-09

    Applicant: BASF AG

    Inventor： HESSE WERNER DR ,  BITTLER KNUT DR

    IPC: B22F1/00 ,  B22F3/02 ,  B22F3/10 ,  B22F3/22 ,  C22C1/05 ,  B01J2/20 ,  B22F9/00 ,  B22F3/115 ,  C22C29/00

    Abstract: Preparation of a granulate by mixing at least one hard material phase (A) with a metal powder (B) and binder (C) and then granulating the mixture - carried out without any pre-mixing of (A) and (B) prior to mixing with (C), which has a viscosity of 20-200 (30-100) cm /10 minutes at 195 degrees C and 2.16 kg load, according to DIN 53735. A process for making moulded articles by injection-moulding one of these granulates is also claimed, in which the granulate is shaped in a mould, binder is removed and then the material is sintered.

    9.
    发明专利
    未知

    公开(公告)号：DE4432459A1

    公开(公告)日：1996-03-14

    申请号：DE4432459

    申请日：1994-09-12

    Applicant: BASF AG

    Inventor： HESSE WERNER DR ,  TOMMUSCHEIT BIRGIT

    IPC: C04B33/14 ,  B44C1/26 ,  B44C3/04 ,  C04B35/00 ,  C04B35/622 ,  C04B35/50 ,  C04B35/10 ,  C04B35/48 ,  C04B35/565 ,  C04B35/584 ,  C04B35/64 ,  B44C3/00

    Abstract: Prodn. of coloured ceramic articles from ≥ 2 granulates contg. Al2O3, zirconium oxide, yttrium oxide, cerium oxide, MgO, SiC and/or Si3N4, a binder, pref. a polyacetal, esp. polyoxymethylene, polyoxymethylene homopolymer and/or a polyoxymethylene copolymer, and colouring particles, pref. a metal (oxide) powder, their precursor cpds. or pigments, esp. lanthanide (oxides), Co, Cr, Cu, Fe, Mn, MO, Nb, Ni, Pb, Si, Sn, Ti, V, W or their oxides, esp. CoO, CO2O3, CO3O4, Cr2O3, Cu2O, CrO, Fe2O3, Fe3O4, MnO, Mn2O3, MnO2, MoO2, MoO3, NbO, NbO2, Nb2O5, NiO, PbO, PbO2, SiO2, SnO, SnO2, TiO, Ti2O3, TiO2, VO2, V2O5, WO2, W25, WO3, metal salts or complexes, esp. carboxylates, carborates, nitrates or acetylacetonates, or speckled pigments from the crystal classes, Baddeleyites, Hematite, Kassiterite, corindum, olivine, rutile, sphene, spinels, or zircons. The compsns. are moulded, dehindered and unsintered. The granules contain different colouring particles and/or different concns. of the particles. At least one of the granulates contain 0.05-20 wt.% of the colouring particles and ≥ 1 granulates contains 30-60 wt.% binder. Also claimed are ceramic articles produced from the granules.

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