ES2037650T1 - CERAMIC PARTICLES UNIFORMLY COATED. - Google Patents

CERAMIC PARTICLES UNIFORMLY COATED.

Info

Publication number
ES2037650T1
ES2037650T1 ES90902580T ES90902580T ES2037650T1 ES 2037650 T1 ES2037650 T1 ES 2037650T1 ES 90902580 T ES90902580 T ES 90902580T ES 90902580 T ES90902580 T ES 90902580T ES 2037650 T1 ES2037650 T1 ES 2037650T1
Authority
ES
Spain
Prior art keywords
silicon
crushed
water
carbide
ceramic particles
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
ES90902580T
Other languages
Spanish (es)
Inventor
Param H. Tewari
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Saint Gobain Abrasives Inc
Original Assignee
Norton Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US07/450,200 external-priority patent/US5098740A/en
Application filed by Norton Co filed Critical Norton Co
Publication of ES2037650T1 publication Critical patent/ES2037650T1/en
Pending legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
    • C04B35/56—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides
    • C04B35/565—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides based on silicon carbide
    • C04B35/575—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides based on silicon carbide obtained by pressure sintering
    • C04B35/5755—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbides or oxycarbides based on silicon carbide obtained by pressure sintering obtained by gas pressure sintering
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
    • C04B35/58—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides
    • C04B35/584—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides based on silicon nitride
    • C04B35/593—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides based on silicon nitride obtained by pressure sintering
    • C04B35/5935—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on borides, nitrides, i.e. nitrides, oxynitrides, carbonitrides or oxycarbonitrides or silicides based on silicon nitride obtained by pressure sintering obtained by gas pressure sintering
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/64—Burning or sintering processes
    • C04B35/645—Pressure sintering
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/64—Burning or sintering processes
    • C04B35/645—Pressure sintering
    • C04B35/6455—Hot isostatic pressing

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Ceramic Products (AREA)

Abstract

SOLIDOS QUE SE SOMETEN A UNA REACCION DELETEREA CON UN MEDIO DE DISPERSION EN EL QUE ESTAN SUSPENDIDOS PUEDEN TRITURARSE DE FORMA SEGURA EN ESE MEDIO DE SUSPENSION SUMINISTRANDO EN EL UN SURFACTANTE CAPAZ DE REACCIONAR CON EL SOLIDO A UNA VELOCIDAD MAYOR QUE LA QUE PUEDE ALCANZAR EL MEDIO DE DISPERSION REACCIONANDO DE TAL FORMA QUE SE SUPRIME LA REACCION DELETEREA. EN PARTICULAR, NITRURO DE SILICIO O CARBURO DE SILICIO DESINTERIZADOS, QUE CUANDO SE PUSIERAN EN CONTACTO CON AGUA SE DESCOMPONDRIAN PARA FORMAR SILICIO EN SUS SUPERFICIES, PUEDE TRITURARSE EN AGUA, SIN PRODUCIR CANTIDADES EXCESIVAS DE SILICIO. LAS DISPERSIONES PRODUCIDAS SON LO SUFICIENTEMENTE ESTABLES COMO PARA FILTRARSE A TRAVES DE ABERTURAS DE 2 MICRONES CON UNA PERDIDA NO MAYOR DEL 5% DEL NITURO O CARBURO DE SILICONA. LAS DISPERSIONES ESTABLES DE SOLIDOS EN LIQUIDOS PUEDEN REVESTIRSE CON UN SOLIDO DISTINTO MEDIANTE PRECIPITACION DE SUPERFICIE BAJO CONDICIONES QUE EXCLUYEN LA FORMACION DE UN PRECIPITADO VOLUMETRICO. ASI, LASPARTICULAS CERAMICAS DE NITRURO O CARBURO SE REVISTEN CON ADITAMENTOS DE DENSIFICACION, COMO ITRIA, POR EL PRECIPITADO DE SUPERFICIE DE LOS HIDROXIDOS CORRESPONDIENTES EN LAS PARTICULAS CERAMICAS EN AGUA. LOS POLVOS DE CERAMICA PREPARADOS DE ESTE MODO SE DENSIFICAN PARA DAR PRODUCTOS CON MODULOS DE RUPTURA Y RESISTENCIAS A LAS FRACTURAS POR LO MENOS TAN ALTAS COMO LA DE LOS POLVOS TRITURADOS DE FORMA CONVENCIONAL EN ALCOHOL CON MENORES CANTIDADES DE ADITAMENTOS DE DENSIFICACION.SOLIDS SUBMITTED TO A SPELL REACTION WITH A DISPERSION MEDIA IN WHICH THEY ARE SUSPENDED MAY BE SAFE CRUSHED IN THAT SUSPENSION MEANS, PROVIDING IN THE SURFACTANT ABILITY TO REACT WITH THE SOLID AT A SPEED MORE THAN THEY CAN OF DISPERSION REACTING IN SUCH A WAY THAT DELETERAL REACTION IS SUPPRESSED. IN PARTICULAR, DISINTERIZED SILICON NITRIDE OR SILICON CARBIDE, WHICH, WHEN COMING IN CONTACT WITH WATER, DECOMPOSED TO FORM SILICON IN ITS SURFACES, CAN BE CRUSHED IN WATER, WITHOUT PRODUCING EXCESSIVE AMOUNTS OF SILICON. THE DISPERSIONS PRODUCED ARE SUFFICIENTLY STABLE TO LEAK THROUGH 2 MICRON OPENINGS WITH A LOSS OF NO MORE THAN 5% OF THE NITURO OR CARBIDE OF SILICONE. STABLE DISPERSIONS OF SOLIDS IN LIQUIDS MAY BE COATED WITH A DIFFERENT SOLID THROUGH SURFACE PRECIPITATION UNDER CONDITIONS THAT EXCLUDE THE FORMATION OF A VOLUMETRIC PRECIPITATE. THEREFORE, CERAMIC PARTICLES OF NITRIDE OR CARBIDE ARE COATED WITH DENSIFICATION ATTACHMENTS, SUCH AS ITRIA, BY THE PRECIPITATED SURFACE OF THE CORRESPONDING HYDROXIDES IN CERAMIC PARTICLES IN WATER. CERAMIC POWDERS PREPARED IN THIS WAY ARE DENSIFIED TO PROVIDE PRODUCTS WITH BREAKING MODULES AND FRACTURE RESISTANCE AT LEAST AS HIGH AS THAT OF POWDERS CRUSHED CONVENTIONALLY IN ALCOHOL WITH LOWER AMOUNTS OF DENSIFICATION ADDAMENTS.

ES90902580T 1988-12-22 1989-12-19 CERAMIC PARTICLES UNIFORMLY COATED. Pending ES2037650T1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US28820888A 1988-12-22 1988-12-22
US07/450,200 US5098740A (en) 1989-12-13 1989-12-13 Uniformly-coated ceramic particles

Publications (1)

Publication Number Publication Date
ES2037650T1 true ES2037650T1 (en) 1993-07-01

Family

ID=26964891

Family Applications (1)

Application Number Title Priority Date Filing Date
ES90902580T Pending ES2037650T1 (en) 1988-12-22 1989-12-19 CERAMIC PARTICLES UNIFORMLY COATED.

Country Status (6)

Country Link
EP (1) EP0449990A4 (en)
CA (1) CA2006338A1 (en)
DK (1) DK114091A (en)
ES (1) ES2037650T1 (en)
FI (1) FI913050A0 (en)
WO (1) WO1990006906A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9015892D0 (en) * 1990-07-19 1990-09-05 Tioxide Group Services Ltd Compositions
GB9015890D0 (en) * 1990-07-19 1990-09-05 Tioxide Group Services Ltd Process for forming ceramics
US5273699A (en) * 1992-02-14 1993-12-28 The Dow Chemical Company Moisture-resistant aluminum nitride powder and methods of making and using

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5864280A (en) * 1981-10-12 1983-04-16 住友電気工業株式会社 Manufacture of non-oxide ceramics sintered body
JPS60151273A (en) * 1984-01-19 1985-08-09 トヨタ自動車株式会社 Manufacture of ceramic-coated fine powder of metal compound
DE3508171A1 (en) * 1985-03-07 1986-09-11 Elektroschmelzwerk Kempten GmbH, 8000 München METHOD FOR PRODUCING SINTER-ACTIVE SILICON CARBIDE AND / OR BORCARBIDE POWDER
US4814128A (en) * 1985-08-01 1989-03-21 Gte Laboratories Incorporated Process for making a homogeneous doped silicon nitride article
JPH0788258B2 (en) * 1985-08-01 1995-09-27 ジ−・テイ−・イ−・ラボラトリ−ズ・インコ−ポレイテツド Method for producing silicon nitride powder having good sinterability
DE3637506A1 (en) * 1986-11-04 1988-05-05 Bayer Ag METHOD FOR PRODUCING ENGINEERING-CERAMIC POWDERS WITH ADDITIVES

Also Published As

Publication number Publication date
EP0449990A1 (en) 1991-10-09
CA2006338A1 (en) 1990-06-22
WO1990006906A1 (en) 1990-06-28
EP0449990A4 (en) 1993-01-27
FI913050A0 (en) 1991-06-20
DK114091D0 (en) 1991-06-13
DK114091A (en) 1991-08-22

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