Macroscopic modelling of the reaction bonding of aluminum oxide

Gaus, Shaun P.; Chan, Helen M.; Harmer, Martin P.; Caram, Hugo S.

doi:10.1016/s0955-2219(96)00169-0

Cited by 4 publications

(4 citation statements)

References 8 publications

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“…19 As shown in Fig. 9, both samples showed a shrinkage from 200 to 400 C, which might be due to evaporation of Zr(acac) 4 and Al(acac) 3 adsorbed at the surface of the particles. The pure YSZ sample showed no expansion occurring from 400 to 1000 C (Fig.…”

Section: Thermal Analysesmentioning

confidence: 85%

“…3 shows XRD patterns of the particles from suspensions after attrition milling for different times. According to the XRD analyses, Zr(acac) 4 and Al(acac) 3 were formed during milling when ACAC reacted with both YSZ and Al. The XRD peaks of the organo-metallic compounds increased with increase in attrition milling time.…”

Section: Ysz Crystallitesmentioning

confidence: 99%

“…8 shows two exothermal peaks in the DSC plots. The first peak at 259.5 C was accompanied by a weight loss that should be related to the oxidative decomposition of Al(acac) 3 and Zr(acac) 4 which were adsorbed on the particle surface. A significant weight gain from 400 to 590 C corresponds to a sharp peak at $ 537.4 C, indicating that the maximum Al oxidation rate occurs at $ 537.4 C. This weight gain is believed to be due to the complete oxidation of small aluminium particles and the initial stages of oxidation of large Al particles.…”

Section: Thermal Analysesmentioning

confidence: 99%

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Attrition milling of metallic-ceramic particles in acetyl-acetone

Yuan

Wang

Xiao

2004

Journal of the European Ceramic Society

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Section: Thermal Analysesmentioning

confidence: 85%

Section: Ysz Crystallitesmentioning

confidence: 99%

Section: Thermal Analysesmentioning

confidence: 99%

See 1 more Smart Citation

Attrition milling of metallic-ceramic particles in acetyl-acetone

Yuan

Wang

Xiao

2004

Journal of the European Ceramic Society

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“…A simplified form of the model, which only considers the material balances, was shown to be capable of describing the general reaction behavior qualitatively. 26 However, this form of the model failed to capture the complex reaction phenomena. A second form of the model considered the material balances, along with an overall energy balance that allowed for heat generation from the reaction and convective and radiative heat losses while assuming the sample to be isothermal.…”

Section: (1) Development Of the Modelmentioning

confidence: 99%

Controlled Firing of Reaction‐Bonded Aluminum Oxide (RBAO) Ceramics: Part I, Continuum‐Model Predictions

Gaus

Harmer

Chan

et al. 1999

Journal of the American Ceramic Society

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The reaction‐bonded aluminum oxide (RBAO) process is a novel, reaction‐forming technique for producing monolithic, alumina‐based ceramics. Although there has been extensive work on the RBAO process, it is often difficult to reproduce the process and avoid sample cracking. To solve the problems that are associated with the RBAO process, it is necessary to have a fundamental understanding of the reaction‐bonding process and the effects of various processing parameters on the reaction behavior. To gain some insight into the process, a continuum model has been developed. The model, which considers the interaction between the macroscopic material and energy balances, is used to predict conditions under which RBAO bodies may be fired in a controlled manner, i.e., avoiding the runaway reaction. In particular, the effects of the oxygen content of the atmosphere, the heat loss by convection and radiation, the heating cycle, and scale (sample size) have been investigated. For small sample sizes, model predictions indicate that the reaction may be controlled by reducing the oxygen content of the atmosphere, increasing the heat loss, and/or incorporating an isothermal hold into the heating cycle at a temperature just below the ignition temperature. For larger sample sizes, model predictions indicate the need for multiple low‐temperature holds at increasing temperatures. It is believed that firing RBAO bodies in a controlled manner will allow one to avoid sample cracking. Part II of this work presents a complementary experimental study that investigates the reaction behavior and structural integrity of samples that have been fired under the predicted conditions.

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