EFFECT OF HEAT TREATMENT PROCESS ON THE PHYSICAL-MECHANICAL PROPERTIES OF HIGH-PRESSURE GASKETS
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High-pressure gaskets; Pure copper; Heat treatment.Abstract
The high-pressure gaskets in gauges and sensors of measuring devices on navy warships was made from pure copper. The high-pressure gaskets, after being fabricated, was heat-treated to recover its properties after hardened. The microstructure, hardness, fracture toughness and tightness of the product were investigated. The results showed that, after annealing at 450 °C for 60 minutes, the heating rate 5 °C /min, cooled down with the furnace, the crystallization process happened completely, the copper crystals had twin structure; material in soft state with hardness of 41.26 HB. High-pressure gasket had good fracture toughness and good tightness. The gasket did not crack when was compressed under pressure of 400 bar for 5 minutes. When gasket was compressed under pressure of 250 bar for 5 minutes, the pressure drop was 0,04 %.
References
[1]. Phạm Tuấn Anh, Nguyễn Văn Hưng, “Khảo sát, đánh giá một số chỉ tiêu kỹ thuật của đệm khí cao áp cho đồng hồ và cảm biến dùng cho thiết bị đo lường trên tàu chiến đấu Hải quân”, Tạp chí Nghiên cứu Khoa học và Công nghệ quân sự, Số Đặc san HH-VL, 9/2020.
[2]. Мальцев М.В., “Металлография промышленных цветных металлов и сплавов”, М.: Металлургия, 1970, 364 с.
[3]. ГОСТ 1173-2006. “Фольга, ленты, листы и плиты медные”. Технические условия.
[4]. ГОСТ 859-2001, “Медь. Марки”.
[5]. TCVN 256:2006, “Vật liệu kim loại - Thử độ cứng Brinell”.
[6]. ASTM E407-07(2015)e1, “Standard Practice for Microetching Metals and Alloys”.
[7]. ĐLVN 08:2011, “Áp kế kiểu lò xo. Quy trình kiểm định”.
[8]. DIN 7603. “Ring seals and gaskets”.
