Sintered compact, cutting tool formed using sintered compact, and method for manufacturing sintered compact

A method for manufacturing a sintered compact, comprising the steps of:

• preparing cubic sialon;
• preparing β-sialon;
• preparing at least one of a first component and a second component;
• mixing together the cubic sialon, the β-sialon, and the at least one of the first component and the second component to form a mixture;
• and
• sintering the mixture,
• the cubic sialon being obtained by subjecting β-sialon to shock compression,
• the first component being at least one element selected from the group consisting of iron, cobalt, nickel, and group 4 elements, group 5 elements, and group 6 elements of the periodic table,
• the second component being at least one compound comprising at least one element selected from the group consisting of group 4 elements, group 5 elements, and group 6 elements and at least one element selected from the group consisting of carbon, nitrogen, and boron.