2，溫度對TiO2的類型沒有明顯影響。純鈦焊接接頭的氧化過程可描述為：氧氣在表面被吸收；氧化物優(yōu)先在缺陷區(qū)形核；氧化物橫向生長、增厚。在較高溫度下，氧化膜中出現(xiàn)裂紋或空隙，成為O原子傳輸通道，導(dǎo)致O和Ti原子的高擴(kuò)散速率和氧化速率。;The oxidation behavior, oxidation morphology, and oxidation products of pure Ti joint welded by tungsten inert gas welding technique at 550 °C for different durations (2, 4, 6, and 8 h) and those at different temperatures (650, 750, 850, and 950 °C) for 4 h were investigated. Results show that at 550 °C, the oxidation time has a slight influence on the oxidation behavior of welded joint. The oxidation temperature has a significant impact on the oxidation behavior, and the higher the temperature, the more severe the oxidation of welded joints. The oxidation kinetics is very close to the quasi-linear law at low temperatures. With increasing the temperature, the oxidation rate is increased exponentially. Additionally, the oxidation products generated on the surface of welded joint are TiO2 with anatase and rutile structures, and the temperature barely has effect on the TiO2 type. The oxidation process of pure Ti welded joint can be described as follows: oxygen atoms are absorbed on the surface; oxides preferentially nucleate in the defective zone; oxides grow laterally and the oxidation film becomes thicker. At relatively higher temperatures, the cracks or voids appear in the oxidation film, which become the transmission channels of O atoms, leading to the high diffusion rate of O and Ti atoms and high oxidation rate."/>