Nghiên cứu tăng mật độ hợp kim W-1,5Ni thiêu kết bằng phương pháp thấm hợp kim Al-Cu-Zn
12 lượt xemDOI:
https://doi.org/10.54939/1859-1043.j.mst.FMC.2026.19-27Từ khóa:
Thiêu kết vonfram; Thấm hợp kim cho khung W xốp; Thấm hợp kim Al-Cu-Zn; Thiêu kết hoạt hóa.Tóm tắt
Bài báo này nghiên cứu quá trình tăng mật độ của hỗn hợp W–1,5%Ni được chế tạo bằng phương pháp ép và thiêu kết, đạt mật độ ban đầu từ 77–80% để tạo thành khung W xốp. Quá trình thiêu kết đẳng nhiệt được thực hiện trong lò ống graphit ở nhiệt độ 1700 °C, giữ nhiệt 3 giờ trong môi trường khí bảo vệ Argon (Ar). Niken (1,5%) được sử dụng làm chất hoạt hóa thiêu kết. Sau đó, các lỗ rỗng còn lại được làm đầy bằng phương pháp thấm ướt với hợp kim lỏng 50%Al–30%Cu–20%Zn ở 1000 °C trong 1 giờ. Kỹ thuật thấm ướt bằng hợp kim Al–Cu–Zn đã chứng tỏ hiệu quả trong việc giảm độ xốp của cấu trúc thiêu kết và tăng mật độ thêm khoảng 3–5%, qua đó cải thiện các tính chất cơ học và độ ổn định nhiệt của vật liệu composite thiêu kết, tạo ra vật liệu composite dùng làm bộ phận tản nhiệt.
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