Spiral-orifice ceramic filter for metal casting

US11660663B2 · kind B2 · utility

Assignee

• WUHAN UNIVERSITY OF SCIENCE AND TECHNOLOGY · CN

Inventors

• Guangqiang Li · Shanghai, CN
• Qiang Wang · Beijing, CN
• YU-LIN LIU · Houston, US
• Ao Huang · 红钢城街道, CN
• Wen-Fang Yan · Shanghai, CN
• Wan Zheng · Kowloon, CN
• Huazhi Gu · 红钢城街道, CN

Key dates

• Filing date: Aug 10, 2020
• Grant date: May 30, 2023
• Expiry date: Sep 30, 2041

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B2235/9676
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A spiral-orifice ceramic filter for metal casting, including spiral channels and two drain openings, where the spiral channels are distributed in a ceramic substrate in a staggered manner. By adoption of the spiral channel structure, molten metal may rotate to generate a centrifugal force while flowing forwards so as to promote separation of inclusions. The spiral-orifice ceramic filter for metal casting includes the following components: 90-95 wt % of MgO, 4-8 wt % of SiO2 and 2-4 wt % of ZrO2. Therefore, the spiral-orifice ceramic filter for metal casting has high strength under normal temperature and optional thermal impact resistance under high temperature, and may tolerate the impact of molten metal at 1700° C. or higher without break. The ceramic substrate and the spiral channel are superficially coated with one layer of functional oxide prepared from CaO.2Al2O3, CaO.6Al2O3, Al2O3, TiO2, or Re2O3.