Influence Of Heating Temperature Research Articles

Influence of heating temperature in vacuum on the surface relief of titanium alloy sheet

Influence of heating temperature in vacuum on the surface relief of titanium alloy sheet

Influence of heating temperature on conformational changes of soybean proteins.

Changes of ultracentrifugal patterns of soybean proteins by heating up to 100°C were almost completed at 80°C at lower ionic strength and at 90°C at higher ionic strength. How-ever, changes in DTNB reactive sulfhydryl groups, sulfite reducible disulfide bonds, ultraviolet difference spectra and turbidity of the protein solutions were still observed at temperatures higher than 80 or 90°C. These results suggest that 11S protein dissociates into subunits at a temperature below 80 or 90°C, and that the conformations of these subunits can change at a temperature above 80 or 90°C. When heated at high ionic strength, the protein solution became turbid because of aggregation of proteins. SDS polyacrylamide gel electrophoresis showed that aggregated proteins separated by centrifugation as precipitates were formed from low-mole-cular-weight subunits of 11S protein and non-aggregated proteins remaining in the super-natant were from 7S protein and high-molecular-weight subunits of 11S protein.

Application of dynamic hot pressing in powder metallurgy

1. An equation was derived describing the relationship between γ and W for the dynamic hot pressing of various materials. 2. The influence of heating temperature, specimen proportions, prior pressing, and the scale factor on the densification process of iron powder was determined. 3. Dynamic hot pressing was employed for producing specimens of various porosities, including 0%; compared with sintered specimens, their σB was found to be higher at II<15% and their ductility lower at all II values. 4. Recrystallization annealing increases σB and percentage elongation; at II<6%, the latter exceeds the ductility of sintered specimens. 5. Dynamic hot pressing can advantageously be employed for producing nonporous or low-porosity (below 10–15%) parts.

金属の結晶成長の研究(I)亜鉛について

The influence of heating temperature and annealing time on the crystal growth of cold rolled zinc was studied and the following two experimental expressions of the crystal growth of zinc were induced :(This article is not displayable. Please see full text pdf.) where A is the grain size, t the annealing time, r the reduction of thickness (%), T the heating temperature (absolute scale), Q the activation energy of crystal growth and α, a, δ, d, β, b are constants, respectively. Subsequently, we induced the following experimental expresison of the average velocity of crystal growth :(This article is not displayable. Please see full text pdf.) where V is the average velocity of crystal growth and q, p are constants. And the activation energy Q of the crystal growth of zinc at r=1 or r=0 was calculated from above expressions (\ efeq1), (\ efeq2), or (\ efeq3), and which was as follows : \[Q=17,00∼18,000 cal⁄mol.\]