Publication detail

Two-stage master sintering curve applied to two-step sintering of oxide ceramics

POUCHLÝ, V. MACA, K. SHEN, Z.

Original Title

Two-stage master sintering curve applied to two-step sintering of oxide ceramics

English Title

Two-stage master sintering curve applied to two-step sintering of oxide ceramics

Type

journal article - other

Language

en

Original Abstract

Tetragonal (3 mol% Y2O3) and two cubic zirconia (8 mol% Y2O3) as well as alumina green bodies were used for the construction of the Master Sintering Curve (MSC) created from sets of constant-rate-of-heating (CRH) sintering experiments. The activation energies calculated according to the MSC theory were 770 kJ/mol for Al2O3, 1270 kJ/mol for t-ZrO2, 620 kJ/mol and 750 kJ/mol for c-ZrO2. These values were verified by an alternative approach based on an analysis of the densification rate in the intermediate sintering stage. The MSCs established from the Two-Step Sintering (TSS) experiments showed at high densities a significant deflection from those constructed from the CRH experiments. This deflection was explained by lower sintering activation energy in the closed porosity stage. A new two-stage MSC model was developed to reflect the change in sintering activation energy and to describe TSS. The efficiency of TSS of four materials under investigation was correlated with their activation energies during the final sintering stage.

English abstract

Tetragonal (3 mol% Y2O3) and two cubic zirconia (8 mol% Y2O3) as well as alumina green bodies were used for the construction of the Master Sintering Curve (MSC) created from sets of constant-rate-of-heating (CRH) sintering experiments. The activation energies calculated according to the MSC theory were 770 kJ/mol for Al2O3, 1270 kJ/mol for t-ZrO2, 620 kJ/mol and 750 kJ/mol for c-ZrO2. These values were verified by an alternative approach based on an analysis of the densification rate in the intermediate sintering stage. The MSCs established from the Two-Step Sintering (TSS) experiments showed at high densities a significant deflection from those constructed from the CRH experiments. This deflection was explained by lower sintering activation energy in the closed porosity stage. A new two-stage MSC model was developed to reflect the change in sintering activation energy and to describe TSS. The efficiency of TSS of four materials under investigation was correlated with their activation energies during the final sintering stage.

Keywords

Zirconia; Alumina; Sintering; Master sintering curve; Activation energy

RIV year

2013

Released

01.10.2013

ISBN

0955-2219

Periodical

Journal of the European Ceramic Society

Year of study

33

Number

12

State

GB

Pages from

2275

Pages to

2283

Pages count

9

Documents

BibTex


@article{BUT98913,
  author="Václav {Pouchlý} and Karel {Maca} and Zhijian {Shen}",
  title="Two-stage master sintering curve applied to two-step sintering of oxide ceramics",
  annote="Tetragonal (3 mol% Y2O3) and two cubic zirconia (8 mol% Y2O3) as well as alumina green bodies were used for the construction of the Master Sintering Curve (MSC) created from sets of constant-rate-of-heating (CRH) sintering experiments. The activation energies calculated according
to the MSC theory were 770 kJ/mol for Al2O3, 1270 kJ/mol for t-ZrO2, 620 kJ/mol and 750 kJ/mol for c-ZrO2. These values were verified by an
alternative approach based on an analysis of the densification rate in the intermediate sintering stage. The MSCs established from the Two-Step
Sintering (TSS) experiments showed at high densities a significant deflection from those constructed from the CRH experiments. This deflection
was explained by lower sintering activation energy in the closed porosity stage. A new two-stage MSC model was developed to reflect the change
in sintering activation energy and to describe TSS. The efficiency of TSS of four materials under investigation was correlated with their activation
energies during the final sintering stage.",
  chapter="98913",
  number="12",
  volume="33",
  year="2013",
  month="october",
  pages="2275--2283",
  type="journal article - other"
}