How To Define The Sphericity Of Metal Powder For Additive Manufacturing In Dentistry? Why Is It Necessary To Specify The Sphericity Of Powder?

The sphericity of metal powder refers to the ratio that is the actual cross-sectional area of metal powder particles to the calculated area with the longest diameter on the cross section, and is a measure of the degree of similarity between particles and circles. Generally, it ranges from 0 to 1. The sphericity of a perfect circle is 1. The value of sphericity directly affects the flowability and bulk property of the particles. The higher sphericity of powder, more uniform of the powder spreading and more compact of the printed pieces. In the actual printing and processing, after each layer of powder spreading, the unprocessed powder will be used again, and part of the powder will be melted or sintered together, thus affecting the printing quality. Therefore, it is necessary to specify the sphericity of powder.