The sintered body and the diamond and its manufacturing method and a diamond abrasive grains sintere

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PURPOSE : To improve the fracture, heat and abrasion resistances by sintering a mixture of a compound powder containing a specific element with a phosphorus (compound) powder, a diamond powder or a graphite powder under specific conditions. CONSTITUTION : (A) One or more powders selected from rare earth elements, alkaline earth elements, group IIIB or IVB elements of the periodic table, sulfur or oxides thereof or compounds containing the elements are mixed with (B) a phosphorus compound and a diamond powder or a graphite powder to provide a mixture, which is then kept under conditions of pressure and temperature in a thermodynamically stable region of the diamond and sintered to afford this diamond sintered compact, containing the diamond at 50-99.99% expressed in terms of volume ratio and the residual binding phase comprising a complex or the oxides of the components (A) with (B) and having 0.01-200μm grain diameter.