Disclosed is a spherical powder component comprising: (1) a large spherical powder having a particle size of from about 10 m to about 50 m; and (2) a small spherical powder having a particle size of from about 1 m to about 10 m; wherein at least one of the large spherical powder and at least one of the small spherical powder are made of the same material, and the weight ratio of the large spherical powder to the small spherical powder is from about 25:1 to about 1:25.