| 摘要 |
PURPOSE: To obtain high generating output by sintering a mixture of spherical iron silicide powder and carbon powder, and turning the phase of the sintered body to aβ-phase by heat-treatment and simultaneously removing carbon powder to produce a porous sintered body. CONSTITUTION: Thermal generator material powder, that comprises spherical iron silicide powder 1 mixed uniformly with carbon powder 2 with the grain size of 1/10 of it, is plasma sintered and compressed. When the carbon powder 2 is kneaded, the grains of the carbon powder 2 interposing between the grains of the spherical iron silicide powder 1 are moved to pores 3 by the pressure of sintering and the grains of the iron silicide 1 are not crushed. Neck As that are contacting parts between the grains of the iron silicide 1 are grown enough, the internal resistance of the material is decreased and high generating output is obtained. Then, heat treating the compressed material under a predetermined condition, it is turned toβphase that shown the thermal generator characteristic and the grains of the carbon powder 2 between the grains of the spherical iron silicide powder 1 are burned completely by the heattreatment and the pores 3 are formed in burned parts. As the spherical iron silicide powder 1 is used, the porous structure, in which the pores 3 are uniformly distributed, is formed and high responsiveness to heat is obtained.
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