本文選題：鈷鉻合金 + 穿透深度��； 參考：《南京大學》2016年碩士論文

【摘要】：[研究背景]鈷鉻合金因為優(yōu)異的機械性能、生物相容性以及經(jīng)濟性,而廣泛地應用于口腔內(nèi)各種修復體的制作。對于長跨度的金屬固定橋修復體,為了提高修復體的最終精度,通過將其分段鑄造后進行焊接來完成制作。可摘局部義齒的鑄造支架損壞后,能否完成焊接的修理關(guān)系到修復體的使用壽命。但對于不同的修復類型有著不同的焊接需求,固定橋連接體部分通常有4-10mm2的面積,可摘局部義齒支架厚度為1mm,這兩種修復體分別需要1-2mm、0.5-1mm的焊接的穿透深度。激光焊接技術(shù)在牙科工藝領(lǐng)域的引入,更好地解決上述問題成為可能。激光焊接與傳統(tǒng)的焊接方法(如電弧焊、 電阻焊)相比,具有無需包埋、操作便捷,熱影響區(qū)小等優(yōu)點,使其在口腔領(lǐng)域應用廣泛。[研究目的]目前研究表明,激光焊接技術(shù)盡管具有以上優(yōu)點,但也存在一些問題,如焊接參數(shù)不明確,造成了激光焊接在臨床上應用的困擾,為了解決這一問題,本試驗的目的是通過對不同的激光焊接參數(shù)下,對鈷鉻合金激光焊接后,測定激光穿透深度,揭示各因素與穿透深度之間的相互關(guān)系,為臨床應用時的參數(shù)選擇提供參考。[實驗方法]制作48個6.0 mm×6.0 mm×10 mm3有機玻璃塊作為鑄件,安插鑄道、包埋并完成鑄造。鑄造后冷卻至室溫,去除包埋料、噴砂、切割鑄道后,依次使用240-800目的碳化硅砂紙將其表面研磨光滑。在0.4MPa壓力下,用50微米的A1.03顆粒對試件焊接面噴砂10秒,最后浸泡在丙酮溶液中,超聲清洗10分鐘,吹干保存。將兩個試件10×6mmm2的面相對緊密接觸無間隙,固定在特制的夾具上。激光焊接參數(shù)設置為：光斑直徑、功率和脈沖時間的設置范圍為0.3-1.2m,1.0-2.5kW和2.4-18ms。對焊接面進行焊接后,在體式顯微鏡拍攝焊接面形貌,用Photoshop軟件對穿透深度進行測量。[結(jié)果]1.光斑直徑為0.3mm、0.6mm、0.9mm的實驗組的穿透深度值的范圍0.719-2.41mm、0.501-1.678mm、0.394-1.071mm。在每個光斑直徑的相同能量的組間,隨功率上升穿透深度顯著上升(p0.05)2.光斑直徑為1.2mm的實驗組的穿透深度值的范圍0.281-0.471mm。在每個光斑直徑的相同能量的組間,隨功率上升穿透深度無顯著變化(p0.05)。3.穿透深度隨光斑直徑的增大而顯著降低(P0.05)；不同功率下的穿透深度有顯著差異(P0.05)；隨脈沖時間的變化,穿透深度值變化顯著(P0.05)。光斑直徑對穿透深度影響是最大的(F值=68.894),其次是功率(F值=29.616),再次是脈沖時間(F值=14.398)。光斑直徑、功率、脈沖時間兩兩交互作用不顯著(P0.05)。[結(jié)論]1. 本實驗推導出穿透深度的公式：穿透深度=0.353-1.02×光斑直徑+0.527×功率+0.046×脈沖時間。2.光斑直徑對于鉆鉻合金激光焊接后的穿透深度影響顯著(p0.05),穿透深度值隨光斑直徑的增大而降低。因在較小的能量下,能獲得理想的穿透深度,臨床應用時,應盡量0.3-0.6mm的光斑直徑。3.功率的提高能夠使鈷鉻合金激光焊接的穿透深度增大,從修復體制作的多樣性、操作的便利性、以及節(jié)能、焊接設備的使用壽命,結(jié)合實驗中所獲得數(shù)據(jù),建議功率在1.5-2.0kW進行選擇。
[Abstract]:[background] cobalt chromium alloy is widely used in the manufacture of various prosthesis in oral cavity because of its excellent mechanical properties, biocompatibility and economy. For the long span metal fixed bridge repair body, in order to improve the final precision of the repair body, it is made by welding it after subsection casting. The casting of removable partial denture is made. After the scaffold is damaged, the repair of the weld is related to the service life of the repair body. But for different repair types, there are different welding requirements. The fixed bridge connector usually has an area of 4-10mm2, and the thickness of the removable partial denture bracket is 1mm. The two kinds of repair bodies need the penetration depth of the welding of 1-2mm and 0.5-1mm. The introduction of welding technology in the field of dental technology is possible to better solve the above problems. Compared with the traditional welding methods (such as arc welding, resistance welding), the welding technology has the advantages of no embedding, convenient operation, and small heat influence area, so it is widely used in the field of oral cavity. In order to solve this problem, the purpose of this experiment is to determine the penetration depth of the laser after laser welding of cobalt chromium alloy under different laser welding parameters to reveal the difference between the factors and penetration depth. It provides reference for the selection of parameters in clinical application. [experimental methods] make 48 6 mm x 6 mm x 10 mm3 organic glass blocks as castings, insert castings, bury and complete the casting. After casting, cooling to room temperature, after the removal of embedded materials, sand blasting and cutting casting, the surface of the 240-800 silicon carbide paper is used to grind and smooth the surface. Under the pressure of 0.4MPa, 50 micron A1.03 particles are used to sandblast the specimen for 10 seconds, and finally soaked in acetone solution, ultrasonic cleaning for 10 minutes, and dry preservation. The surface of two specimens of 10 x 6mmm2 is closely contacted with no gap and fixed on the special fixture. The laser welding parameters are set as spot diameter, power and pulse time. After welding the welding surface with 0.3-1.2m, 1.0-2.5kW and 2.4-18ms., the weld surface morphology was photographed on the body microscope and the penetration depth was measured by Photoshop software. [results the range of penetration depth of the]1. spot diameter of 0.3mm, 0.6mm, 0.9mm of the experimental group was 0.719-2.41mm, 0.501-1.678mm, 0.394-1.071mm. in each spot diameter. Between groups with the same energy, the range of penetration depth of the experimental group with a significant increase in the penetration depth of power (P0.05) 2. is 1.2mm, and the range 0.281-0.471mm. of the penetration depth of the experimental group is 1.2mm. There is no significant change in the penetration depth of each spot diameter (P0.05) with the increase of the penetration depth of the power (P0.05) with the increase of the diameter of the spot. There is a significant difference in penetration depth at different power (P0.05); with the change of pulse time, the penetration depth changes significantly (P0.05). The diameter of the spot has the greatest impact on the penetration depth (F value =68.894), followed by the power (F value =29.616), and again the pulse time (F value =14.398). The 22 interaction of the spot diameter, power and pulse time is not obvious. [conclusion (P0.05). [conclusion]1. this experiment derives the formula of penetration depth: the penetration depth of =0.353-1.02 * the diameter of the spot of +0.527 * * power +0.046 * pulse time.2. spot diameter has a significant influence on the penetration depth after the Cr alloy laser welding (P0.05), and the penetration depth decreases with the increase of the direct diameter of the spot. In the ideal penetration depth, in clinical application, the enhancement of 0.3-0.6mm's spot diameter.3. power can increase the penetration depth of the co Cr alloy laser welding, the diversity of the repair, the convenience of the operation, the energy saving, the service life of the welding equipment, the data obtained in the bonding experiment, and the proposed power in the 1.5-2.0kW Choice.

【學位授予單位】：南京大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：R783.1

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