TY - JOUR
T1 - Neck growth kinetics during microwave sintering of nickel powder
AU - Demirskyi, D.
AU - Agrawal, D.
AU - Ragulya, A.
PY - 2011/2/3
Y1 - 2011/2/3
N2 - Model experiments on initial stage of microwave sintering of nickel powder showed anomalous neck-growth rate during isothermal soaking, which is not the case for conventional sintering. Neck growth was determined as a function of time. Values for the neck growth exponent in the neck growth equation, (x/a)n = Bt, of 5.2, 5.4, 5.8, and 5.9 were found for within the temperature range 700-950 °C, respectively. The evidences of formation of liquid phase during microwave sintering have been revealed, that may support enhancement of mass transfer during sintering process. The activation energy of 48 kJ mol-1 was found for microwave sintering of nickel, according to sphere-to-sphere model. Value revealed is significantly lower then values for conventional sintering (136 kJ mol-1), and is on same level with activation energy for diffusion of metals in liquid state. An explanation and analysis of this phenomenon has been attempted.
AB - Model experiments on initial stage of microwave sintering of nickel powder showed anomalous neck-growth rate during isothermal soaking, which is not the case for conventional sintering. Neck growth was determined as a function of time. Values for the neck growth exponent in the neck growth equation, (x/a)n = Bt, of 5.2, 5.4, 5.8, and 5.9 were found for within the temperature range 700-950 °C, respectively. The evidences of formation of liquid phase during microwave sintering have been revealed, that may support enhancement of mass transfer during sintering process. The activation energy of 48 kJ mol-1 was found for microwave sintering of nickel, according to sphere-to-sphere model. Value revealed is significantly lower then values for conventional sintering (136 kJ mol-1), and is on same level with activation energy for diffusion of metals in liquid state. An explanation and analysis of this phenomenon has been attempted.
KW - Diffusion
KW - Metals
KW - Microstructure
KW - Microwave heating
KW - Sintering
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U2 - 10.1016/j.jallcom.2010.10.042
DO - 10.1016/j.jallcom.2010.10.042
M3 - Article
AN - SCOPUS:78651365599
SN - 0925-8388
VL - 509
SP - 1790
EP - 1795
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
IS - 5
ER -