Isotropic boron nitride, preparation method of isotropic boron nitride and product prepared from isotropic boron nitride

The invention relates to isotropic boron nitride, a preparation method of the isotropic boron nitride and a product prepared from the isotropic boron nitride. The method for preparing the isotropic boron nitride comprises the following steps that anisotropic boron nitride comprising gaps is combined with water; the water permeates into the gaps; the gaps are expanded; and the combination, permeation or expansion is repeated optionally.