活塞環(huán)用Mo及Mo基復(fù)合涂層的摩擦磨損性能研究
發(fā)布時間：2019-02-23 20:47
【摘要】：活塞環(huán)與缸套構(gòu)成的摩擦副,是內(nèi)燃機(jī)中重要的機(jī)構(gòu)。同時也是內(nèi)燃機(jī)中運(yùn)行狀況最為苛刻的部件�？量痰墓ぷ鳝h(huán)境決定了活塞環(huán)涂層材料的特殊性,純陶瓷涂層易產(chǎn)生裂紋,而純金屬材料的耐磨性較差,金屬陶瓷復(fù)合涂層往往表現(xiàn)出優(yōu)異的耐磨性能。熱噴涂Mo及Mo基復(fù)合涂層由于其良好的力學(xué)性能與摩擦學(xué)性能被廣泛的應(yīng)用與活塞環(huán)涂層的制造。本文采用大氣等離子噴涂在45鋼表面制備了Mo及30Wt.%Al2O3-Mo復(fù)合涂層,研究了Mo及Al2O3-Mo復(fù)合涂層的微觀組織結(jié)構(gòu)和力學(xué)性能;并考察了涂層與GCr15球配對副對摩時在常溫至300°C時的干摩擦磨損性能;采用JSM-5610L型掃描電子顯微鏡分析了涂層的微觀形貌和磨痕形貌;探討了不同溫度、不同載荷下Mo及Al2O3-Mo復(fù)合涂層的磨損機(jī)理。結(jié)果表明:1、等離子噴涂制備Mo涂層的孔隙率為8.13%,低于Al2O3-Mo復(fù)合涂層(10.06%)。Al2O3-Mo復(fù)合涂層硬度為406.5±8HV,高于純Mo涂層,這歸因于Al2O3陶瓷顆粒的彌散增強(qiáng)作用。純Mo涂層與基體的結(jié)合強(qiáng)度42.2±3.2MPa,高于Al2O3-Mo復(fù)合涂層,Al2O3顆粒的加入一定程度上降低了Mo涂層的結(jié)合強(qiáng)度,兩種涂層的層內(nèi)結(jié)合強(qiáng)度均高于涂層與基體界面結(jié)合強(qiáng)度。2、與GCr15配對付對摩時,隨著環(huán)境溫度和載荷的升高,Mo涂層的摩擦系數(shù)與磨損率均逐漸升高。常溫時,在10N~40N載荷下,Mo涂層的摩擦系數(shù)為0.43~0.7,磨損率為0.59×10-5mm3/N?m~2.989×10-5mm3/N?m范圍內(nèi)。在常溫至300°C溫度范圍內(nèi),保持30N載荷不變時,隨著溫度的升高,摩擦系數(shù)和磨損率均逐漸增加;300°C對摩時,Mo涂層的摩擦系數(shù)和磨損率分別為1.14和11.2×10-5mm3/N?m,比常溫時分別增加了120%和418%。常溫下,Mo涂層的磨損機(jī)制以塑性變形、磨粒磨損為主,磨損類型為單一的機(jī)械類磨損。100°C~300°C溫度下,Mo涂層的主導(dǎo)磨損機(jī)制逐漸轉(zhuǎn)變?yōu)檎持p和氧化磨損,隨溫度的升高,涂層的粘著現(xiàn)象也越嚴(yán)重。3、與GCr15配對付對摩時,Al2O3-Mo復(fù)合涂層的摩擦學(xué)性能與純Mo涂層區(qū)別較大。Al2O3-Mo復(fù)合涂層的摩擦系數(shù)和磨損率隨加載載荷的升高而增加,而隨環(huán)境溫度的變化則呈先上高后降低的趨勢。在300°C,30N載荷下,Al2O3-Mo涂層的磨損率最大值達(dá)到8.01×10-5 mm3/N?m。當(dāng)環(huán)境溫度為常溫時,純Mo涂層耐磨性能優(yōu)于Al2O3-Mo復(fù)合涂層。但Al2O3-Mo復(fù)合涂層在100°C~300°C溫度區(qū)4、間的高溫摩擦學(xué)性能明顯優(yōu)于純Mo涂層。Al2O3的加入增加了涂層的硬度,提高了涂層的高溫抗變形能力,有效的降低了涂層與配對副之間的粘著現(xiàn)象,使得Al2O3-Mo復(fù)合涂層具有比純Mo涂層更好的高溫耐磨性能。
[Abstract]:The friction pair between piston ring and cylinder liner is an important mechanism in internal combustion engine. It is also the most demanding component in internal combustion engine. The harsh working environment determines the particularity of the coating material of piston ring. The pure ceramic coating is prone to crack while the wear resistance of pure metal material is poor. The cermet composite coating often shows excellent wear resistance. Thermal sprayed Mo and Mo based composite coatings have been widely used in the manufacture of piston ring coatings because of their good mechanical and tribological properties. In this paper, Mo and 30Wt.%Al2O3-Mo composite coatings were prepared on 45 steel by atmospheric plasma spraying. The microstructure and mechanical properties of Mo and Al2O3-Mo composite coatings were studied. The dry friction and wear properties of the coating and GCr15 ball pair were investigated at room temperature to 300 擄C, and the microstructure and wear trace of the coating were analyzed by JSM-5610L scanning electron microscope (SEM). The wear mechanism of Mo and Al2O3-Mo composite coatings at different temperatures and loads was discussed. The results show that: 1, the porosity of Mo coating prepared by plasma spraying is 8.13, which is lower than that of Al2O3-Mo composite coating (10.06%). The hardness of Al2O3-Mo composite coating is 406.5 鹵8HVC, which is higher than that of pure Mo coating. This is attributed to the dispersion enhancement of Al2O3 ceramic particles. The bonding strength between pure Mo coating and substrate was 42.2 鹵3.2MPa, which was higher than that of Al2O3-Mo composite coating. The bonding strength of Mo coating was decreased to some extent by adding Al2O3 particles. The in-layer bonding strength of the two coatings was higher than that of the interface between the coating and the substrate. 2. The friction coefficient and wear rate of the Mo coating increased with the increase of ambient temperature and load. At room temperature, the friction coefficient and wear rate of Mo coating are 0.430.7and 0.59 脳 10-5mm3/N?m~2.989 脳 10-5mm3/N?m under 10N~40N load. In the range of normal temperature to 300 擄C, the friction coefficient and wear rate increase with the increase of temperature when the load of 30N is kept constant. The friction coefficient and wear rate of the Mo coating are 1.14 and 11.2 脳 10 ~ (-5) mm / 3 / N ~ (-1), 120% and 418% higher than those at room temperature, respectively. At room temperature, the wear mechanism of Mo coating is plastic deformation and abrasive wear, and the wear type is single mechanical wear. At the temperature of 100 擄C ~ (300 擄C), the dominant wear mechanism of Mo coating is gradually changed into adhesive wear and oxidation wear, and with the increase of temperature, the main wear mechanism of Mo coating is changed into adhesive wear and oxidation wear. The more serious the adhesion phenomenon of the coating is. 3, the tribological properties of the Al2O3-Mo composite coating are different from that of the pure Mo coating when it is matched with GCr15. The friction coefficient and wear rate of the Al2O3-Mo composite coating increase with the increase of the loading load, and the friction coefficient and wear rate of the Al2O3-Mo composite coating increase with the increase of the loading load. However, with the change of ambient temperature, the temperature increased first and then decreased. The maximum wear rate of Al2O3-Mo coating was 8.01 脳 10 ~ (-5) mm3/N?m. under 300 擄C _ (30) N load. When ambient temperature is normal, the wear resistance of pure Mo coating is better than that of Al2O3-Mo composite coating. However, the high temperature tribological properties of Al2O3-Mo composite coatings in the temperature range of 100 擄C ~ 300 擄C are obviously superior to those of pure Mo coatings. The hardness of the coatings is increased with the addition of Al2O3, and the deformation resistance of the coatings at high temperature is improved. The adhesion between the coating and the pair is reduced effectively, and the Al2O3-Mo composite coating has better wear resistance at high temperature than the pure Mo coating.
【學(xué)位授予單位】：湖南科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TK403;TG174.4
本文編號：2429185
[Abstract]:The friction pair between piston ring and cylinder liner is an important mechanism in internal combustion engine. It is also the most demanding component in internal combustion engine. The harsh working environment determines the particularity of the coating material of piston ring. The pure ceramic coating is prone to crack while the wear resistance of pure metal material is poor. The cermet composite coating often shows excellent wear resistance. Thermal sprayed Mo and Mo based composite coatings have been widely used in the manufacture of piston ring coatings because of their good mechanical and tribological properties. In this paper, Mo and 30Wt.%Al2O3-Mo composite coatings were prepared on 45 steel by atmospheric plasma spraying. The microstructure and mechanical properties of Mo and Al2O3-Mo composite coatings were studied. The dry friction and wear properties of the coating and GCr15 ball pair were investigated at room temperature to 300 擄C, and the microstructure and wear trace of the coating were analyzed by JSM-5610L scanning electron microscope (SEM). The wear mechanism of Mo and Al2O3-Mo composite coatings at different temperatures and loads was discussed. The results show that: 1, the porosity of Mo coating prepared by plasma spraying is 8.13, which is lower than that of Al2O3-Mo composite coating (10.06%). The hardness of Al2O3-Mo composite coating is 406.5 鹵8HVC, which is higher than that of pure Mo coating. This is attributed to the dispersion enhancement of Al2O3 ceramic particles. The bonding strength between pure Mo coating and substrate was 42.2 鹵3.2MPa, which was higher than that of Al2O3-Mo composite coating. The bonding strength of Mo coating was decreased to some extent by adding Al2O3 particles. The in-layer bonding strength of the two coatings was higher than that of the interface between the coating and the substrate. 2. The friction coefficient and wear rate of the Mo coating increased with the increase of ambient temperature and load. At room temperature, the friction coefficient and wear rate of Mo coating are 0.430.7and 0.59 脳 10-5mm3/N?m~2.989 脳 10-5mm3/N?m under 10N~40N load. In the range of normal temperature to 300 擄C, the friction coefficient and wear rate increase with the increase of temperature when the load of 30N is kept constant. The friction coefficient and wear rate of the Mo coating are 1.14 and 11.2 脳 10 ~ (-5) mm / 3 / N ~ (-1), 120% and 418% higher than those at room temperature, respectively. At room temperature, the wear mechanism of Mo coating is plastic deformation and abrasive wear, and the wear type is single mechanical wear. At the temperature of 100 擄C ~ (300 擄C), the dominant wear mechanism of Mo coating is gradually changed into adhesive wear and oxidation wear, and with the increase of temperature, the main wear mechanism of Mo coating is changed into adhesive wear and oxidation wear. The more serious the adhesion phenomenon of the coating is. 3, the tribological properties of the Al2O3-Mo composite coating are different from that of the pure Mo coating when it is matched with GCr15. The friction coefficient and wear rate of the Al2O3-Mo composite coating increase with the increase of the loading load, and the friction coefficient and wear rate of the Al2O3-Mo composite coating increase with the increase of the loading load. However, with the change of ambient temperature, the temperature increased first and then decreased. The maximum wear rate of Al2O3-Mo coating was 8.01 脳 10 ~ (-5) mm3/N?m. under 300 擄C _ (30) N load. When ambient temperature is normal, the wear resistance of pure Mo coating is better than that of Al2O3-Mo composite coating. However, the high temperature tribological properties of Al2O3-Mo composite coatings in the temperature range of 100 擄C ~ 300 擄C are obviously superior to those of pure Mo coatings. The hardness of the coatings is increased with the addition of Al2O3, and the deformation resistance of the coatings at high temperature is improved. The adhesion between the coating and the pair is reduced effectively, and the Al2O3-Mo composite coating has better wear resistance at high temperature than the pure Mo coating.
【學(xué)位授予單位】：湖南科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TK403;TG174.4
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