Dispersion for silicon carbide sintered body, green sheet for silicon carbide sintered body and prepreg material for silicon carbide sintered body using the same, and manufacturing method thereof

A manufacturing method of a dispersion for a silicon carbide sintered body, comprising a mixing step of mixing:

• a water dispersion containing silicon carbide particles,
• a water dispersion containing boron nitride particles, and
• an aqueous solution containing a resin having a hydroxyl group,
• wherein the silicon carbide particles and the boron nitride particles have charges of the same sign, and a pH of the dispersion for a silicon carbide sintered body at 25° C. is less than or equal to 7.0,
• wherein the method further comprises, before the mixing step:
• a preparing step for a water dispersion containing silicon carbide particles of adding a charge control agent and an acid to a raw dispersion containing silicon carbide particles such that pH is in a range of greater than or equal to 9.0 and less than or equal to 12.0, thereby forming coated silicon carbide particles including a coating layer containing a charge control component on a surface of the silicon carbide particles to prepare a water dispersion containing silicon carbide particles;
• and
• in the preparing step for a water dispersion containing silicon carbide particles, the charge control agent is sodium aluminate.