Thay đổi thiết kế đầu phun plasma dùng không khí

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Tác giả: Thanh Tùng Nguyễn, Dương Vũ

Ngôn ngữ: Vie

Ký hiệu phân loại: 621 Applied physics

Thông tin xuất bản: Tạp chí khoa học và công nghệ Đại Học Duy Tân, 2022

Mô tả vật lý: 45518

Bộ sưu tập: Metadata

ID: 404017

Thêm vào giỏ Liên kết toàn văn

Phun plasma trong khí quyển (APS) được ứng dụng phổ biến trong ngành công nghiệp. Cho đến nay, các khí chính phổ biến được sử dụng là: Khí trơ, khí hoạt hóa, khí trơ trong hỗn hợp khí hoạt hóa. Khí trơ như Argon hoặc Heli là loại khí đơn nguyên tử và chúng có dòng plasma nhiệt độ cao nhưng entanpy không quá cao. Entanpy của dòng plasma có thể tăng lên nếu một phần khí hoạt hóa được thêm vào. Trong môi trường của khí trơ, các hạt (phun) và chất nền được bảo vệ khỏi quá trình oxy hóa. Mặt khác, khí hoạt hóa như không khí được thêm vào để tạo ra entanpy cao. Tùy vào vật liệu phủ (hạt bột) và vật liệu nền để chọn khí chính (sinh plasma) cho phù hợp. So với khí trơ, không khí rẻ hơn và đặc biệt là trong việc phun vật liệu gốm, đây là lợi thế rõ ràng. Dựa trên cơ sở này, bài báo tập trung thiết kế hệ thống phun plasma sử dụng không khí làm khí chính. Đó là một số giải pháp cụ thể trong thiết kế đầu phun plasma. Thí nghiệm được thiết lập nhằm ứng dụng bột vô định hình để kiểm chứng hoạt động của hệ thống., Tóm tắt tiếng anh, The atmospheric plasma spray (APS) is a popular application in the industry. Until now, the common primary gases are inert gases, active gases, and inert gases in the mixture with the active ones. The inert gas like Argon or Helium are the monoatomic and have the high temperature of plasma flow under but not too high enthalpy. The enthalpy of the plasma flow can be increased, if a small percentage of the active gases is added. In the environment of the inert gas, the particles and substrate are protected from the oxidation process. On the other hand, the active gas like the air is added to provide the high enthalpy. Depending on the coating material (powder particle) and the substrate material, the primary gas will be chosen properly. The air is much cheaper, and especially in spraying the ceramic material, it showed a greater advantage in comparison with the inert gas. Based on this conception, the work focuses on designing the system for plasma spraying using the air as primary gas. There are some specific solutions in designing plasma torch. The experiment was set for the application of amorphous powder to verify the operation of this system.

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