AQUEOUS SOLUTION COMPOSITION AND METHOD FOR PRODUCING THE SAME, OXIDE POWDER AND METHOD FOR PRODUCING THE SAME, CARBIDE POWDER AND METHOD FOR PRODUCING THE SAME, AND CEMENTED CARBIDE AND METHOD FOR PRODUCING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a cemented carbide having high hardness.SOLUTION: An aqueous solution composition has tungstate ions of 10 mass% or more and 30 mass% or less relative to water 1 kg, transition metal ions of 0.05 mass% or more and 5 mass% or less relative to water 1 kg, with the balance being counter anions and water. The transition metal ions include cobalt ions. The counter anions include organic acid ions. The organic acid ions are multidentate ligands.SELECTED DRAWING: None