深冷處理對齒科純鈦激光焊接焊區(qū)性能的影響
發(fā)布時間：2018-09-19 07:33
【摘要】：目的： 激光焊接是口腔修復(fù)的重要技術(shù),其焊接質(zhì)量關(guān)系修復(fù)體成敗,研究焊區(qū)處理工藝提高其綜合性能是口腔修復(fù)界多年的努力方向。本研究采用深冷處理方法在模擬口腔環(huán)境條件下對焊接試樣進(jìn)行處理,以改善齒科純鈦激光焊接焊區(qū)綜合性能。通過力學(xué)性能測試及分析,優(yōu)化深冷處理工藝,對比與焊接后未處理及熱處理組效果,進(jìn)行耐腐蝕性能及生物性能的初步研究,探討深冷處理在口腔修復(fù)中的臨床應(yīng)用。 方法： 采用德國Dentaurum生產(chǎn)Comlaser-4型激光焊接機對齒科純鈦進(jìn)行焊接,試樣焊縫長6mm,厚0.5mm。采用體外冷熱循環(huán)和人工唾液浸泡模擬口腔生理環(huán)境。 1.優(yōu)化深冷處理工藝：將焊接試樣隨機分為六組,其中四組在液氮溫度下分別保溫2h、12h、24h、48h,一組為傳統(tǒng)的熱處理組,一組為未經(jīng)處理的對照組,通過測試六組試樣的抗拉強度、延伸率及顯微硬度優(yōu)化處理工藝,并以此工藝作為下列實驗深冷處理組。 2.力學(xué)性能評價：將試樣分為四組(母材組,深冷母材組,激光焊接組,深冷焊接組),冷熱循環(huán)1000次后再浸泡于人工唾液中90天后取出,測試其力學(xué)性能,觀察分析顯微組織和斷口形貌。 3.疲勞性能評價：模擬口腔生理環(huán)境,應(yīng)用Instron E10000電子動靜態(tài)萬能材料試驗機測試深冷處理后焊件的疲勞強度,并與未深冷處理組進(jìn)行比較,繪制出兩條S-N曲線,計算其疲勞特征值,并對疲勞斷口進(jìn)行掃描電鏡觀察。 4.腐蝕性能及抗菌性能評價：測量四組試樣(母材組,深冷母材組,激光焊接組,深冷焊接組)的極化曲線,計算其特征性參數(shù),擬合其在人工唾液中的電化學(xué)阻抗譜,并利用掃描電鏡觀察四組焊件的抗菌情況。 5.摩擦磨損性能評價：使用MMV-1立式萬能摩擦磨損實驗機測量試樣的磨損體積損失量,觀察試樣表面磨損形貌。 結(jié)果： 1.24h深冷處理組的抗拉強度及延伸率比其他各組有大幅度提高,并且其焊區(qū)硬度并未大幅降低,力學(xué)性能較好。 2.在模擬口腔環(huán)境下,純鈦母材的抗拉強度和延伸率經(jīng)深冷處理后分別提高了6.24%和2.2%,而純鈦激光焊接焊區(qū)的抗拉強度和延伸率分別提高了20.82%和150%。母材斷口呈韌性斷裂,未經(jīng)深冷處理的焊件斷口呈脆性斷裂,深冷處理焊件斷口呈混合準(zhǔn)解理斷裂。深冷處理后母材晶粒尺寸明顯減小,焊區(qū)組織更均勻。 3.在同一應(yīng)力范圍下,深冷處理后純鈦焊件的疲勞循環(huán)次數(shù)均高于對照組,深冷處理組的疲勞強度特征值△ok為121.884MPa,S-N曲線的斜率m為5.94,均高于未深冷組(97.000MPa,5.40),深冷處理后疲勞強度提高了25.65%。相同的應(yīng)力下,深冷組層片狀二次斷裂不如未深冷組明顯。深冷組最終斷裂面韌窩尺寸較大,呈韌窩斷裂,而未深冷組的斷面韌窩較少,呈準(zhǔn)解理斷裂。 4.深冷處理后純鈦激光焊接焊區(qū)的擊穿電位(Eb)值為0.455V,△E值為1.365V,Rp值為282110Ω·cm2,均高于未深冷處理純鈦焊區(qū)(0.047V,0.629V,6654Ω.cm2)。深冷處理后焊區(qū)表面細(xì)菌粘附量少于未深冷處理組。 5.深冷處理后純鈦激光焊接焊區(qū)的磨損體積量小于未深冷組(P0.05),其磨損機制為磨粒磨損,而后者磨損機制主要為粘著磨損同時伴磨粒磨損。結(jié)論： 1.純鈦激光焊件的優(yōu)化深冷處理工藝為：液氮溫度(-196℃)下保溫24h。 2.模擬口腔環(huán)境下,與未深冷處理的焊接組對比,深冷處理提高純鈦焊件抗拉強度及延伸率。同時對焊區(qū)拉伸性能的提高也優(yōu)于母材。 3.深冷處理明顯提高純鈦激光焊接焊區(qū)的疲勞強度。 4.深冷處理顯著提高純鈦焊接焊區(qū)的耐腐蝕性能及抗菌性能。 5.深冷處理提高激光焊接焊區(qū)的摩擦磨損性能。
[Abstract]:Objective:
Laser welding is an important technique in prosthodontics, and its welding quality is related to the success or failure of prosthodontics. To improve the comprehensive performance of prosthodontics, it has been a long-term endeavor for prosthodontics to study the welding zone treatment technology. The mechanical properties were tested and analyzed to optimize the cryogenic treatment process. The effects of cryogenic treatment on corrosion resistance and biological properties were compared with those of untreated and heat treated groups.
Method:
The dental pure titanium was welded by Comlaser-4 laser welding machine made in Dentaurum, Germany. The weld length of the sample was 6 mm and the thickness was 0.5 mm. The oral physiological environment was simulated by in vitro cold and hot cycling and artificial saliva soaking.
1. Optimizing the cryogenic treatment process: The welded specimens were randomly divided into six groups. Four groups were kept in liquid nitrogen for 2 h, 12 h, 24 h and 48 h, one group was the traditional heat treatment group, the other group was the untreated control group. The tensile strength, elongation and microhardness of the six groups of specimens were tested and optimized. Cryogenic treatment group.
2. Mechanical properties evaluation: The specimens were divided into four groups (base metal group, cryogenic base metal group, laser welding group, cryogenic welding group). After 1000 cycles, the specimens were soaked in artificial saliva for 90 days. The mechanical properties were tested, and the microstructure and fracture morphology were observed and analyzed.
3. Fatigue performance evaluation: The fatigue strength of weldments after cryogenic treatment was tested by Instron E10000 electronic dynamic and static universal material testing machine. Two S-N curves were drawn and their fatigue characteristic values were calculated. The fatigue fracture was observed by scanning electron microscope.
4. Corrosion and antibacterial evaluation: Polarization curves of four groups of samples (base metal group, cryogenic base metal group, laser welding group, cryogenic welding group) were measured, their characteristic parameters were calculated, their electrochemical impedance spectra in artificial saliva were fitted, and their antibacterial properties were observed by scanning electron microscope.
5. Friction and wear performance evaluation: MMV-1 vertical universal friction and wear tester was used to measure the wear volume loss and observe the surface wear morphology.
Result:
The tensile strength and elongation of 1.24 h cryogenic treatment group were much higher than those of other groups, and the hardness of welded zone was not significantly reduced, and the mechanical properties were better.
2. In the simulated oral environment, the tensile strength and elongation of pure titanium base metal increased by 6.24% and 2.2% respectively after cryogenic treatment, while the tensile strength and elongation of pure titanium laser welding zone increased by 20.82% and 150% respectively. The fracture of base metal was ductile fracture, the fracture of weldment without cryogenic treatment was brittle fracture, and the fracture of cryogenic treatment weldment was fracture. Mixed quasi cleavage fracture. After cryogenic treatment, the grain size of parent material decreases obviously, and the microstructure of welding zone is more uniform.
3. In the same stress range, the fatigue cycle times of pure titanium weldments after cryogenic treatment were higher than those of the control group. The characteristic value of fatigue strength of cryogenic treatment group was 121.884 MPa, and the slope of S-N curve was 5.94, which was higher than that of non-cryogenic treatment group (97.000 MPa, 5.40). The fatigue strength of cryogenic treatment group was increased by 25.65% under the same stress. The secondary fracture is less obvious than that of the non-cryogenic group. The final fracture surface dimple size of the cryogenic group is larger, showing dimple fracture, while the fracture surface dimple of the non-cryogenic group is less, showing quasi-cleavage fracture.
4. After cryogenic treatment, the breakdown potential (Eb) value of pure titanium laser welded zone is 0.455V, Delta E value is 1.365V, Rp value is 282110 cm 2, which is higher than that of pure titanium welded zone without cryogenic treatment (0.047V, 0.629V, 6654 cm 2).
5. The wear volume of laser welding zone of pure titanium after cryogenic treatment is smaller than that of non-cryogenic treatment (P 0.05). The wear mechanism is abrasive wear, while the latter is mainly adhesive wear and abrasive wear.
1. the optimum cryogenic treatment process for pure titanium laser weldment is: liquid nitrogen temperature (-196 C) and heat preservation 24h..
2. In the simulated oral environment, compared with the welding group without cryogenic treatment, cryogenic treatment can improve the tensile strength and elongation of pure titanium weldments, and the tensile properties of the welding zone are also better than the base metal.
3. cryogenic treatment obviously improves the fatigue strength of pure titanium laser welded zone.
4. cryogenic treatment can significantly improve the corrosion resistance and antibacterial properties of pure titanium welding zone.
5. cryogenic treatment can improve the friction and wear properties of laser welding area.
【學(xué)位授予單位】：天津醫(yī)科大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：R783.6
本文編號：2249458
[Abstract]:Objective:
Laser welding is an important technique in prosthodontics, and its welding quality is related to the success or failure of prosthodontics. To improve the comprehensive performance of prosthodontics, it has been a long-term endeavor for prosthodontics to study the welding zone treatment technology. The mechanical properties were tested and analyzed to optimize the cryogenic treatment process. The effects of cryogenic treatment on corrosion resistance and biological properties were compared with those of untreated and heat treated groups.
Method:
The dental pure titanium was welded by Comlaser-4 laser welding machine made in Dentaurum, Germany. The weld length of the sample was 6 mm and the thickness was 0.5 mm. The oral physiological environment was simulated by in vitro cold and hot cycling and artificial saliva soaking.
1. Optimizing the cryogenic treatment process: The welded specimens were randomly divided into six groups. Four groups were kept in liquid nitrogen for 2 h, 12 h, 24 h and 48 h, one group was the traditional heat treatment group, the other group was the untreated control group. The tensile strength, elongation and microhardness of the six groups of specimens were tested and optimized. Cryogenic treatment group.
2. Mechanical properties evaluation: The specimens were divided into four groups (base metal group, cryogenic base metal group, laser welding group, cryogenic welding group). After 1000 cycles, the specimens were soaked in artificial saliva for 90 days. The mechanical properties were tested, and the microstructure and fracture morphology were observed and analyzed.
3. Fatigue performance evaluation: The fatigue strength of weldments after cryogenic treatment was tested by Instron E10000 electronic dynamic and static universal material testing machine. Two S-N curves were drawn and their fatigue characteristic values were calculated. The fatigue fracture was observed by scanning electron microscope.
4. Corrosion and antibacterial evaluation: Polarization curves of four groups of samples (base metal group, cryogenic base metal group, laser welding group, cryogenic welding group) were measured, their characteristic parameters were calculated, their electrochemical impedance spectra in artificial saliva were fitted, and their antibacterial properties were observed by scanning electron microscope.
5. Friction and wear performance evaluation: MMV-1 vertical universal friction and wear tester was used to measure the wear volume loss and observe the surface wear morphology.
Result:
The tensile strength and elongation of 1.24 h cryogenic treatment group were much higher than those of other groups, and the hardness of welded zone was not significantly reduced, and the mechanical properties were better.
2. In the simulated oral environment, the tensile strength and elongation of pure titanium base metal increased by 6.24% and 2.2% respectively after cryogenic treatment, while the tensile strength and elongation of pure titanium laser welding zone increased by 20.82% and 150% respectively. The fracture of base metal was ductile fracture, the fracture of weldment without cryogenic treatment was brittle fracture, and the fracture of cryogenic treatment weldment was fracture. Mixed quasi cleavage fracture. After cryogenic treatment, the grain size of parent material decreases obviously, and the microstructure of welding zone is more uniform.
3. In the same stress range, the fatigue cycle times of pure titanium weldments after cryogenic treatment were higher than those of the control group. The characteristic value of fatigue strength of cryogenic treatment group was 121.884 MPa, and the slope of S-N curve was 5.94, which was higher than that of non-cryogenic treatment group (97.000 MPa, 5.40). The fatigue strength of cryogenic treatment group was increased by 25.65% under the same stress. The secondary fracture is less obvious than that of the non-cryogenic group. The final fracture surface dimple size of the cryogenic group is larger, showing dimple fracture, while the fracture surface dimple of the non-cryogenic group is less, showing quasi-cleavage fracture.
4. After cryogenic treatment, the breakdown potential (Eb) value of pure titanium laser welded zone is 0.455V, Delta E value is 1.365V, Rp value is 282110 cm 2, which is higher than that of pure titanium welded zone without cryogenic treatment (0.047V, 0.629V, 6654 cm 2).
5. The wear volume of laser welding zone of pure titanium after cryogenic treatment is smaller than that of non-cryogenic treatment (P 0.05). The wear mechanism is abrasive wear, while the latter is mainly adhesive wear and abrasive wear.
1. the optimum cryogenic treatment process for pure titanium laser weldment is: liquid nitrogen temperature (-196 C) and heat preservation 24h..
2. In the simulated oral environment, compared with the welding group without cryogenic treatment, cryogenic treatment can improve the tensile strength and elongation of pure titanium weldments, and the tensile properties of the welding zone are also better than the base metal.
3. cryogenic treatment obviously improves the fatigue strength of pure titanium laser welded zone.
4. cryogenic treatment can significantly improve the corrosion resistance and antibacterial properties of pure titanium welding zone.
5. cryogenic treatment can improve the friction and wear properties of laser welding area.
【學(xué)位授予單位】：天津醫(yī)科大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：R783.6
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