NL2030967B1 - Method for graphene-assisted flash sintering of ceramic materials at room temperature - Google Patents

Method for graphene-assisted flash sintering of ceramic materials at room temperature Download PDF

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NL2030967B1
NL2030967B1 NL2030967A NL2030967A NL2030967B1 NL 2030967 B1 NL2030967 B1 NL 2030967B1 NL 2030967 A NL2030967 A NL 2030967A NL 2030967 A NL2030967 A NL 2030967A NL 2030967 B1 NL2030967 B1 NL 2030967B1
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graphene
room temperature
sintering
green body
flash sintering
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NL2030967A
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English (en)
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Jiang Juan
Xiao Weiwei
Hao Wei
Ni Na
Yu Yali
Fan Xiaohui
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Univ Shanghai Jiaotong
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    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
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    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/48—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on zirconium or hafnium oxides, zirconates, zircon or hafnates
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    • 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
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    • 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
    • C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
    • C04B35/62605—Treating the starting powders individually or as mixtures
    • C04B35/62625—Wet mixtures
    • C04B35/62635—Mixing details
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    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
    • C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
    • C04B2235/6567—Treatment time
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
    • C04B2235/66—Specific sintering techniques, e.g. centrifugal sintering
    • C04B2235/666—Applying a current during sintering, e.g. plasma sintering [SPS], electrical resistance heating or pulse electric current sintering [PECS]

Claims (7)

  1. Conclusies l. Werkwijze voor het grafeenondersteunde flitssinteren van keramische materialen bij kamertemperatuur met het kenmerk dat deze de volgende stappen omvat: grafeen wordt verdeeld in oplosmiddel en wordt gemengd om zo een grafeenoplossing te verkrijgen; keramiekpoeder wordt toegevoegd aan de grafeenoplossing en wordt uniform gemengd, en het oplosmiddel wordt verwijderd om composietpoeder te verkrijgen, waarbij de grafeeninhoud in het composietpoeder 1 — 10 gew.% bedraagt; het composietpoeder wordt gevormd tot een groen lichaam, en elektrische velden worden aangelegd op de twee uiteinden van het groene lichaam bij kamertemperatuur; en nadat de elektrische velden zijn aangelegd, wordt een beginstroom langzaam verhoogd met een snelheid van minder dan 1 mA/s die 1 — 30 s aanhoudt, wordt een metafasestroom snel verhoogd met een snelheid van 10 — 1000 mA/s die 1 — 10 s aanhoudt, bereikt een eindstroom de maximumwaarde, treedt de stabiliteitsperiode in en die 5 — 20 s aanhoudt, waarbij een materiaal is onderhevig aan sinterverdichting, waarbij het flitssinteren voltooid is, waarbij de flitssintersnelheid hoog is, en waarbij de energie die verbruikt wordt gedurende de verwarmingstijd en deze periode wordt bespaard.
  2. 2. Werkwijze voor het grafeenondersteund flitssinteren van keramische materialen bij kamertemperatuur volgens conclusie 1, waarbij de elektrische veldsterkte die benodigd is voor een gesinterd groen lichaam groter is dan 20 V/cm.
  3. 3. Werkwijze voor het grafeenondersteund flitssinteren van keramische materialen bij kamertemperatuur volgens conclusie 1, waarbij de stroomdichtheid die benodigd is voor het sinteren van een groen lichaam groter is dan 40 mA/mm? .
  4. 4. Werkwijze voor het grafeenondersteund flitssinteren van keramische materialen bij kamertemperatuur volgens één van conclusies 1 — 3, waarbij het grafeen grafeennanoplaatjes, grafeenoxide of gereduceerde grafeenoxide omvat, en waarbij het oplosmiddel gedeïoniseerd water, ethanol, DMF of NMP is.
    S11 -
  5. 5. Werkwijze voor het grafeenondersteund flitssinteren van keramische materialen bij kamertemperatuur volgens één van conclusies 1 — 3, waarbij een grafeenoplossing een concentratie van 0,02 — 8 mg/mL heeft.
  6. 6. Werkwijze voor het grafeenondersteund flitssinteren van keramische materialen bij kamertemperatuur volgens één van conclusies | — 3, waarbij keramisch poeder YSZ, een halfgeleider of een isolator is, waarbij de halfgeleider siliciumcarbide omvat, de isolator aluminiumoxide omvat, en het keramiekpoeder bewerkt is met een kogelmolen en uniform vermengd is in de grafeenoplossing, en oplosmiddel verwijderd wordt in een oven.
  7. 7. Werkwijze voor het grafeenondersteund flitssinteren van keramische materialen bij kamertemperatuur volgens één van conclusies 1 — 3, waarbij een vorm van een groen lichaam een hondenbotvorm, een langestrookvorm, een cilindrische vorm of een schijfvorm is, waarbij elektrische velden worden aangelegd op de twee uiteinden van het samengedrukte groene lichaam, en de lengte van het groene lichaam in de richting van het elektrische veld 1 — 50 cm bedraagt.
NL2030967A 2022-02-16 2022-02-16 Method for graphene-assisted flash sintering of ceramic materials at room temperature NL2030967B1 (en)

Priority Applications (1)

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NL2030967A NL2030967B1 (en) 2022-02-16 2022-02-16 Method for graphene-assisted flash sintering of ceramic materials at room temperature

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NL2030967A NL2030967B1 (en) 2022-02-16 2022-02-16 Method for graphene-assisted flash sintering of ceramic materials at room temperature

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