Đốt nóng nhanh bằng phóng điện khí của gốm YSZ ở nhiệt độ phòng

Journal of Advanced Ceramics - 2022
Yuejin Zhu1, Hongyang Zhou1, Rongxia Huang2, Nianping Yan3, Xiaohao Wang1, Guanghua Liu4, Zhidong Jia1
1Engineering Laboratory of Power Equipment Reliability in Complicated Coastal Environments, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, China
2School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou, 510006, China
3State Grade Jiangxi Electric Power Research Institute, Nanchang, 330000, China
4State Key Laboratory of New Ceramics and Fine Processing Tsinghua University, School of Materials Science and Technology, Tsinghua University, Beijing, 100084, China

Tóm tắt

Tóm tắtNghiên cứu này là nghiên cứu đầu tiên tiến hành quá trình đốt nóng nhanh (flash sintering) của gốm zirconia ổn định yttria (3YSZ) với nồng độ 3 mol% ở nhiệt độ phòng (25 °C) dưới một trường điện mạnh, lớn hơn 1 kV/cm. Tại áp suất khí quyển tiêu chuẩn (101 kPa), xác suất thành công của quá trình đốt nóng nhanh là khoảng một nửa so với ở áp suất khí quyển thấp, dưới 80 kPa. Sự thành công của quy trình đốt nóng nhanh được xác định dựa trên hiệu suất hồ quang điện cao tại các áp suất khí quyển khác nhau từ 20 đến 100 kPa. Các mẫu 3YSZ đạt được mật độ tương đối tối đa là 99,5% với kích thước hạt khoảng 200 nm. Kết quả cho thấy khi áp suất khí quyển giảm, trường điện khởi phát của quá trình đốt nóng nhanh cũng giảm, tương ứng với công thức thực nghiệm của điện áp phóng điện. Hơn nữa, quá trình đốt nóng nhanh được tìm thấy là được kích hoạt bởi phóng điện bề mặt của các mẫu gốm, và hồ quang điện trên bề mặt mẫu đã nổi lên trước khi quá trình đốt nóng nhanh hoàn tất ở áp suất quá cao, dẫn đến thất bại trong quá trình đốt nóng nhanh. Nghiên cứu này tiết lộ một phương pháp mới cho việc chuẩn bị gốm đốt nóng nhanh tại nhiệt độ phòng một cách dễ dàng, điều này sẽ thúc đẩy ứng dụng của quá trình đốt nóng nhanh trong ngành gốm sứ.

Từ khóa


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Journal of Advanced Ceramics

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