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Sản xuất thêm bằng laser với kẽm: chất lượng hình thành, cấu trúc và hành vi của tế bào
Tóm tắt
Quá trình hợp nhất bột kim loại bằng laser (LPBF) cho phép sử dụng kẽm (Zn) phân hủy sinh học để sản xuất các mẫu cấy ghép chỉnh hình tùy chỉnh. Trong nghiên cứu này, chúng tôi khảo sát tác động của công suất laser và tốc độ quét đến sự phát triển của chất lượng bề mặt, độ đặc liên quan và cấu trúc trong quá trình LPBF của các mẫu cấy ghép Zn. Tăng cường công suất laser có khả năng giảm độ nhớt nóng chảy và lực căng bề mặt, từ đó cải thiện sự liên kết kim loại giữa các đường hàn liền kề. Các đường hàn không đồng đều và xoắn cũng trở nên liên tục và thẳng. Tốc độ quét có thể điều chỉnh nhiệt độ của vũng kim loại nóng chảy để kiểm soát sự định hướng tự nhiên của hạt, đạt được các định hướng tinh thể khác nhau và một cấu trúc yếu hơn. Quan trọng là, nó cũng tránh được sự giãn nở và co lại nhiệt do tích lũy năng lượng quá mức trong khung matrix, do đó giảm thiểu việc hình thành mật độ dislocation cao. Kết quả là, bằng cách chọn công suất laser và tốc độ quét hợp lý, các bộ phận LPBF thể hiện bề mặt phẳng và độ đặc cao hơn 99,5%. Độ cứng trung bình, độ bền cơ học và độ kéo dài của chúng lần lượt đạt 50,2 HV, 127,8 MPa và 7,6%. Thêm vào đó, các bộ phận thể hiện tỷ lệ phân hủy vừa phải và các đặc tính tạo xương tuyệt vời. Tất cả các kết quả này cung cấp một cơ sở để lựa chọn các thông số quy trình nhằm tối ưu hóa các tính chất toàn diện của các bộ phận Zn được xử lý bằng LPBF cho các ứng dụng phân hủy sinh học.
Từ khóa
#LPBF #kẽm #cấy ghép chỉnh hình #đặc tính sinh học #cấu trúc kim loạiTài liệu tham khảo
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