Sand for casting mold, manufacturing method for sand casting-mold, and core for metal casting
Sand for a casting mold including sand, a binder, and an inorganic compound particle having poor water solubility and generating a gas, which is at least one of water vapor or carbon dioxide gas, by heat from a molten metal.
1. Sand for a casting mold, comprising:
sand particles;
a binder;
foam generated by foam production; and
inorganic compound particles:
having poor water solubility;
generating at least one of water vapor or carbon dioxide gas by heat from a molten metal;
having a volume average particle diameter smaller than that of the sand particles; and
having a viscosity of from 0.5 Pa·s to 10 Pa·s.
2. The sand for a casting mold according to claim 1 , wherein the inorganic compound particles comprise at least one selected from a group consisting of a carbonate and a hydroxide.
3. The sand for a casting mold according to claim 1 , wherein the binder is water soluble and has a foam-producing ability.
4. The sand for a casting mold according to claim 3 , comprising, as the binder, at least one selected from a group consisting of an anionic surfactant, a nonionic surfactant and an amphoteric surfactant.
5. The sand for a casting mold according to claim 4 , wherein a total added amount of the anionic surfactant, the nonionic surfactant and the amphoteric surfactant is from 0.005% by mass to 0.1% by mass with respect to the sand.
6. The sand for a casting mold according to claim 1 , comprising a water soluble sodium silicate as the binder.
7. The sand for a casting mold according to claim 6 , wherein an added amount of the sodium silicate is from 0.1% by mass to 20.0% by mass with respect to the sand.
8. The sand for a casting mold according to claim 1 , comprising, as the binder, at least one selected from a binder group (A) consisting of polyvinyl alcohol and derivatives thereof, saponin, starch and derivatives thereof, and other sugars.
9. The sand for a casting mold according to claim 8 , wherein a total added amount of the binder contained in the binder group (A) is from 0.1% by mass to 20.0% by mass with respect to the sand.
10. The sand for a casting mold according to claim 1 , which is used for casting of aluminum or an aluminum alloy.
11. The sand for a casting mold according to claim 1 , wherein
the inorganic compound particles comprise at least one selected from the group consisting of magnesium carbonate, magnesium hydroxide, and aluminum hydroxide.
12. The sand for a casting mold according to claim 11 , wherein the binder is water soluble and has a foam-producing ability.
13. The sand for a casting mold according to claim 12 , comprising, as the binder, at least one selected from a group consisting of an anionic surfactant, a nonionic surfactant and an amphoteric surfactant.
14. The sand for a casting mold according to claim 13 , wherein a total added amount of the anionic surfactant, the nonionic surfactant and the amphoteric surfactant is from 0.005% by mass to 0.1% by mass with respect to the sand.
15. The sand for a casting mold according to claim 11 , comprising a water soluble sodium silicate as the binder.
16. The sand for a casting mold according to claim 15 , wherein an added amount of the sodium silicate is from 0.1% by mass to 20.0% by mass with respect to the sand.
17. The sand for a casting mold according to claim 11 , comprising, as the binder, at least one selected from a binder group (A) consisting of polyvinyl alcohol and derivatives thereof, saponin, starch and derivatives thereof, and other sugars.
18. The sand for a casting mold according to claim 17 , wherein a total added amount of the binder contained in the binder group (A) is from 0.1% by mass to 20.0% by mass with respect to the sand.
19. The sand for a casting mold according to claim 11 , which is used for casting of aluminum or an aluminum alloy.