Polycrystalline silicon fragments and process for comminuting polycrystalline silicon rods

US10876221B2 · kind B2 · utility

Assignee

• Wacker Chemie AG · DE

Inventors

• Reiner Pech · Vilshofen an der Donau, DE
• Peter Gruebl · Triftern, DE

Key dates

• Filing date: Aug 7, 2014
• Grant date: Dec 29, 2020
• Expiry date: Jun 11, 2037

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C30B15/00
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Comminuted polysilicon with reduced contamination is prepared using multi-step comminution employing comminution with comminution tools of differing tungsten carbide content and/or grain size.