【摘要】：目的:將氧化鑭(La_2O_3)和納米二氧化硅(SiO_2)添加到氧化鋯陶瓷粉體中,來探索二者的最佳添加比例,以使氧化鋯陶瓷的斷裂韌性、抗彎強(qiáng)度、維氏硬度及體積密度最佳,并通過掃描電鏡觀察試件斷裂面的顯微形態(tài),以探索材料致密度的變化。方法:將La_2O_3和納米SiO_2按照質(zhì)量比分別為0、0,0.5wt%、0,1wt%、0,0、0.5wt%,0、1wt%,0.5wt%、0.5wt%,0.5wt%、1wt%,1wt%、0.5wt%,1wt%、1wt%添加到氧化鋯陶瓷粉體中,依次為A組、B_1組、B_2組、C_1組、C_2組、D_1組、D_2組、D_3組、D_4組,其中對照組為A組,實驗組為B_1、B_2、C_1、C_2、D_1、D_2、D_3和D_4組。將混合后的粉體球磨混勻,脫水干燥,冷等靜壓成型,采用兩段式燒結(jié)工藝進(jìn)行無壓固相燒結(jié),得到斷裂韌性試件,規(guī)格為25 mm×2.5 mm×5 mm,同時得到抗彎強(qiáng)度和硬度試件,規(guī)格為35 mm×3 mm×4 mm,在磨拋機(jī)上研磨上下表面,在丙酮和無水乙醇中分別超聲清洗,烘干、備用,進(jìn)行斷裂韌性、抗彎強(qiáng)度、維氏硬度及體積密度測試,用掃描電鏡隨機(jī)觀察斷裂韌性試件斷裂面的顯微形態(tài)進(jìn)而確定其致密度。結(jié)果:除D_3和D_4組外,其余組的斷裂韌性、抗彎強(qiáng)度、維氏硬度及體積密度均有顯著差異(P0.05);比較B組和C組,發(fā)現(xiàn)在改善氧化鋯陶瓷性能方面,La_2O_3優(yōu)于納米SiO_2;且C_2組優(yōu)于C_1組,B_1組優(yōu)于B_2組;D_2組最佳。掃描電鏡觀察顯示D_2組晶粒均勻緊密排列,完全致密;D_3、D_4組致密度低于A組,其余組優(yōu)于A組低于D_2組。結(jié)論:在改善氧化鋯陶瓷性能方面,La_2O_3和納米SiO_2起協(xié)同作用,且La_2O_3優(yōu)于納米SiO_2,且當(dāng)La_2O_3的添加量為0.5wt%,納米SiO_2的添加量為1wt%時,氧化鋯陶瓷的機(jī)械性能最佳。
[Abstract]:Objective: to explore the optimum addition ratio of lanthanum oxide (La_2O_3) and nano-silica (SiO_2) to zirconia ceramic powder in order to make the fracture toughness and bending strength of zirconia ceramics. Vickers hardness and volume density were the best. The micromorphology of fracture surface was observed by scanning electron microscope in order to explore the change of the density of the material. Methods: the mass ratios of La_2O_3 and nano-SiO_2 were 0,0,0.5wt%, 0,1wt%, 0,0,0.5wt%, 0,1wt%, 0.5wt%, 0.5wt%, 0.5wt%, 0.5wt%, 1WT%, 0.5wt%, 1wt%, 1WT%, 0.5wt%, 1WT%, respectively, and the mass ratio was 0,0,0.5wt%, 0.5wt%, 0wt%, 0.5wt%, 0.5wt%, 1WT%, 0.5wt%, 0.5wt%, 1wt%, respectively. 1 wt% was added to zirconia ceramic powder, followed by group A, group B, group C, group D, group 2, group D, group A, group B, group B, C, D, D and D groups. The mixed powder was ball-milled, dehydrated and dried, and formed by cold isostatic pressing. The fracture toughness specimens were obtained by two-stage sintering process without pressing and solid phase sintering. The bending strength and hardness samples were obtained at the same time with the specification of 25 mm 脳 2.5 mm 脳 5 mm,. The specification is 35 mm 脳 3 mm 脳 4 mm, for grinding the upper and lower surfaces on the polishing machine, ultrasonic cleaning, drying, and standby in acetone and absolute ethanol, respectively. Fracture toughness, bending strength, Vickers hardness and volume density are tested. The micromorphology of fracture toughness specimen was observed by scanning electron microscope (SEM) and the density of fracture toughness specimen was determined. Results: there were significant differences in fracture toughness, bending strength, Vickers hardness and volume density between the other groups except D + 3 and D + 4 (P0.05). Compared with group B and C, it was found that La_2O_3 was superior to nano-SiO_2; in improving the properties of Zirconia ceramics, C _ (2) was superior to C _ (?) 1, B _ (?) 1 was better than B _ (?) 2, and D _ (?) 2 was the best. Scanning electron microscopy (SEM) showed that the grain density of group D _ (3), D _ (4) was lower than that of group A, and that of other groups was better than that of group A, and that of group D ~ (2) was better than that of group A (P < 0.05). Conclusion: in improving the properties of zirconia ceramics, La_2O_3 and nano-SiO_2 have synergistic effect, and La_2O_3 is superior to nano-SiO_2, and when the addition of La_2O_3 is 0.5 wt%, The mechanical properties of zirconia ceramics were the best when the addition of nano-SiO_2 was 1 wt%.
【學(xué)位授予單位】：佳木斯大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：R783.1

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