JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2021
·
IF 5.302
Zuodong Liu,Yumeng Ji,Chunyan Xu,Yuqing Wang,Yang Liu,Qilong Shen,Guoqiang Yi,Yongsheng Yu,Bingchu Mei,Peng Liu,Qiangshan Jing
Raw SrF 2 powders were synthesized by the chemical precipitation method, and the mean particle size was 58.48 nm. Er:SrF 2 transparent ceramics were obtained by hot-pressed (HP) technique, and the effect of ErF 3 levels on the transparency, microstructure, luminescence spectroscopic and microhardness were studied. The ratio of emission intensities R (Red/Green) increased with the ErF 3 doping levels. The addition of ErF 3 was found effectively to reduce grain size and has a positive effect on improving the microhardness. The SrF 2 ceramic doped with 5 wt.% ErF 3 (2 mm thick) showed the best optical transparency, the transmittance at 500 nm and 1200 nm are 87.9 % and 89.5 %, respectively. The average grain size, Vickers hardness ( Hv ), and fracture toughness ( K IC ) for the SrF 2 ceramic were 21.1 ± 4.5 μm, 1.73 ± 0.04 GPa, and 0.52 ± 0.08 MPa·m 1/2 , respectively.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2024
·
IF 6.2
Shuxin You,Shilong Xing,Chuanhai Jiang
The synergistic mechanism of microparticles and nanoparticles on optimizing microstructures homogeneity and enhancing microhardness and corrosion resistance of mixed coatings was deeply researched by co-electrodepositing CeO 2 microparticles and CeO 2 nanoparticles into nickel matrix. Microparticles contribute to enhancing the microhardness of the coating, while nanoparticles promote the homogeneity of the microstructure, thereby improving the corrosion resistance of the coating. Therefore, by co-electrodepositing microparticles and nanoparticles into the nickel matrix, microparticles and nanoparticles in the nickel matrix generate a synergistic optimization effect, combining the advantages of microparticles and nanoparticles. Microparticles are mainly responsible for enhancing the microhardness of the coating, while nanoparticles are responsible for promoting the homogeneity of the microstructure in the coating, maintaining a homogeneous distribution of microhardness, and improving the corrosion resistance of the coating. Ultimately, the mixed coating achieves both high microhardness and excellent corrosion resistance, along with homogeneous microhardness distribution.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
TRIBOLOGY LETTERS
·
2019
·Vol. 67
·期 4
·1-11
·
IF 2.235
Ma Yanjun,Ye Yinping,Wan Hongqi,Chen Lei,Zhou Huidi,Chen Jianmin
A novel in-situ-synthesis strategy via one-pot thermal decomposition of a single-source precursor was developed to fabricate silver sulfide (Ag 2 S) nanoparticles with monodispersity and narrow size distribution in the polyamide-imide (PAI) nanocomposite coatings. The crystalline phases, size, morphologies, and growth mechanism of the in-situ-synthesized Ag 2 S nanoparticles were characterized by X-ray diffraction, ultrahigh-resolution field emission scanning electron microscopy, Fourier transform infrared spectroscopy, and thermogravimetric analysis. The enhancement effect of such in-situ-synthesized Ag 2 S nanoparticles on the microhardness and tribological behaviors of the PAI nanocomposite coatings were also investigated and compared with mechanically mixed Ag 2 S particles. Results show that the growth of Ag 2 S particles is greatly limited during the in-situ preparation process. The Ag 2 S nanoparticles with small size ranging from 100 to 130 nm are purely formed and exhibit monodispersibility in the PAI nanocomposite coatings. Besides, the appropriate Ag 2 S nanoparticles greatly promote the microhardness and antiwear performance of the PAI nanocomposite coatings, especially when their incorporation content reaches 5.0 wt%. The enhancement effects of these in-situ-synthesized Ag 2 S nanoparticles on microhardness and wear resistance of PAI nanocomposite coatings are superior to that of the mechanically mixed Ag 2 S particles. This is attributed to the improvement of cohesion strength and the load-carrying capacity of the PAI nanocomposite coatings enhanced by in-situ-synthesized Ag 2 S nanoparticles.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NON-CRYSTALLINE SOLIDS
·
2024
·
IF 3.2
Zijuan Du,Zhitao Shan,Ang Qiao,Haizheng Tao,Yuanzheng Yue
Aluminate glasses are known for their superior mechanical and optical properties. Here, we investigated the tantalum (Ta)-lanthanum (La) mixing effect on structural and mechanical properties of these glasses. Using the aerodynamic levitation and laser melting technique, we prepared a series of aluminate glasses with the molar composition 54Al 2 O 3 ·(46-x)La 2 O 3 ·xTa 2 O 5 , where x = 0.0, 9.2, 18.4, 23.0, 32.2, 36.8, and 46.0. The structural, thermal, and mechanical analyses revealed that substituting Ta for La strongly impacted the local Al environment in the glasses, thereby affecting their glass transition temperature and mechanical properties. The Vickers microhardness ( H V ) varied non-monotonically with the molar ratio R (defined as Ta/(Ta+La) = x /46), reaching a maximum H V value of 8.59 GPa at R = 0.8. This trend was explained in terms of both the average bond energy and the bond number density. Moreover, the crack initiation resistance of the studied glasses increased as R rose. This work aids in the design of oxide glasses with high crack resistance and hardness.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2019
·
IF 2.794
R. Wang,Z.M. Xie,Y.K. Wang,J.P. Song,Q.F. Fang,R. Liu,Y. Jiang,J.F. Yang,T. Zhang,X.P. Wang,C.S. Liu
In this paper, high density nanocrystalline W with uniform dispersion of nanosized oxide particles was fabricated via a dissolution-precipitation process by well controlled high-energy ball milling of the raw powder materials of Y 2 O 3 , Ti and W and the subsequent spark plasma sintering (SPS). XRD and TEM analysis revealed that the Y 2 O 3 and Ti were dissolved in W matrix during the high-energy ball milling and the Y 2 Ti 2 O 7 particles were precipitated in the SPS process, resulting in the refinement in both W grains and oxide particles. The average grain size of W is 67 nm. The average size of particles in grain interior and at grain boundaries is 8.5 nm and 16.4 nm, respectively. The Vickers microhardness of such a nanostructured W alloy is as high as 1441 Hv, which is 2–3 times that of the ever reported W alloys. Such a dissolution-precipitation process offers a general pathway for manufacturing nanocrystalline refractory metals with dispersion of nanoscale oxides in a controllable manner.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED ENGINEERING MATERIALS
·
2023
·Vol. 25
·期 19
·2300474
·
IF 3.6
Qiu Hong,Siyuan Wang,Shaohui Yin
This study fabricates certain Ni/diamond composite coatings using a coelectrodeposition method and then evaluates the effect of diamond content on the morphology, phase structure, microhardness, wear, and corrosion resistance of such coatings, while exploring their tribological and anticorrosion mechanisms. It is demonstrated that the addition of diamond can change the preferred orientation of Ni from (200) to (111), and its texture coefficient value can be boosted from 23.3% to 64.4% with the increase of diamond content. In the experiment, at a diamond content of 3 g L −1 , the deposited diamond particles are more and evenly dispersed across the composite, with the microhardness of nickel-based coatings reaching an optimum value of 613 HV. In addition, the coefficient of friction is reduced to a minimum value of 0.627, while the wear rate is kept at only 1.79 × 10 −5 mm 3 Nm −1 , indicating a high wear resistance. Electrochemical test results demonstrate that the Ni/diamond composite coatings produced at 3 g L −1 create the maximum charge transfer resistance (5429.3 Ω cm 2 ) and the minimum corrosion current density (2.19 μA cm −2 ), features that can deliver the best corrosion resistance.
研究领域:
材料科学
·
表面工程
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Odontology
·
2025
·
IF 2.4
Kim Soyeon,Larnani Sri,Son Ji Eun,Lappanakokiat Napas,Truong Van Mai,Jin Bo-Hyoung,Park Young-Seok
This study investigates the effects of different treatment sequences involving demineralization, brushing, and remineralization on the calcium and phosphorus (Ca/P) content, surface roughness, and microhardness of dentin specimens. Bovine dentin samples were subjected to the following five treatment conditions: control, demineralization, demineralization followed by remineralization, demineralization followed by brushing then remineralization, and demineralization followed by remineralization then brushing. X-ray fluorescence spectroscopy was then utilized to assess the elementary composition changes, while scanning electron microscopy provided microstructural analyses. Surface roughness and microhardness were also quantified to assess the physical changes in dentin. The control group retained significantly higher Ca/P content compared with all treated groups, indicating that demineralization, regardless of subsequent treatment, leads to a substantial loss of hydroxyapatite. Among the treated groups, those that underwent remineralization immediately after demineralization manifested higher Ca/P retention compared with those that included brushing before remineralization. Additionally, microhardness measurements indicated that post-demineralization brushing negatively affected dentin’s microhardness. The sequence of demineralization, brushing, and remineralization treatments significantly affects Ca/P retention in dentin, along with its surface roughness and microhardness. Pre-remineralization brushing diminished mineral recovery, whereas exposure to mineral-rich beverage immediately after demineralization resulted in greater mineral deposition.
研究领域:
牙科医学
·
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Jinsu Yu,Hsinshen Ho,Jiangyi Chen
As a transmission part, the service life of the shaft parts directly affects the machining efficiency and economic benefit, and requires higher surface hardness and wear resistance. In this study, the Ti/B 4 C/dr40 composite powder was cladded on the shaft part surface via laser cladding to improve the microhardness and wear resistance. The microstructure evolution and phase structure were analyzed to reveal the strengthening mechanism of Ti and B 4 C on dr40 coating. The Ti/B 4 C/dr40 composite coating with low defects and good interface metallurgical bonding quality between coating and substrate was prepared on the 45# steel shaft part. The results show that the main phase in the Ti/B 4 C/dr40 composite coating is TiC, TiB 2 , Cr 2 C 3 , (Ti, Cr) C, (Ti, Cr, Fe, Ni) (C, B). With the addition content of Ti increasing, the grain densifies, the sieve-reticular structure and small strip phase at grain boundary and intergranular area change as massive phase. Moreover, the microhardness improves up to 2.05 times than that of dr40 coating. The in-situ synthesis of carbides and borides are evenly distributed in the coating, which improves the deformation resistance of the coating. In addition, the precipitation and solid solution strengthening caused by reinforcement phase also enhanced matrix strength for supporting reinforcement phases, improving the coating wear resistance.
研究领域:
材料科学
·
机械工程
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
ENGINEERING FAILURE ANALYSIS
·
2022
·
IF 3.634
Anhua Ren,Min Kang,Xiuqing Fu
Ni/WC-MoS 2 composite coatings were fabricated in electrolytes with different MoS 2 doping levels using jet electrodeposition. We investigated the surface characteristics of Ni/WC-MoS 2 composite coatings, including the composition, surface morphology, microhardness and tribological behaviour. We also analysed the Ni/WC-MoS 2 composite coating wear mechanism during the wear process. The outcomes determined that Ni/WC-MoS 2 coatings had better surface quality, smaller grain size and larger coating thickness than Ni/WC coatings. The doping of MoS 2 promoted the deposition of WC in the coatings, which further enhanced the microhardness of the coatings. The Ni/WC-MoS 2 composite coatings doped at a MoS 2 concentration of 5 g/L exhibited a maximal microhardness of 730 HV 0.1 . Doping by MoS 2 effectively minimized the coefficients of friction ( CoFs ) of the composite coatings to 0.3. During the wear process, the repair effect of MoS 2 and formation of oxidised friction films transformed the adhesive wear into oxidative wear assisted by abrasive wear, which improved the abrasion resistance of the coatings and diminished the wear rate. The wear rate of the Ni/WC-5 g/L MoS 2 composite coating decreased by 47.34 % in comparison with that of coatings without MoS 2 doping, which was 7.44 × 10 4 μm 3 /N∙m. The findings indicate that doping MoS 2 can effectively enhance the surface wear resistance. This research provides a practical approach to prolong the service life of metal parts.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2022
·
IF 4.804
Lei Huang,Yafei Pan,Jiuxing Zhang,Yong Du,Yuhui Zhang
W-30Si refractory targets were widely used as gate materials in the field of semiconductor integrated circuits. This work aimed to study the microstructure, densification mechanism, and mechanical properties of W-30Si targets prepared by spark plasma sintering (SPS). The results manifested that the punch displacement and relative density rose as temperatures increased, and the sintering route processed at 1200 °C included four parts. A fully dense target can be obtained at 1200 °C, while part of Si would volatilize at 1220 °C. No significant variation was observed in grain sizes from 1000 to 1200 °C, thus it was believed that the consolidation predominated over this temperature range. The effective stress exponent ( n ) was generally regarded as a parameter closely related to the densification mechanism. At the initial stage of 1000 to 1200 °C and the late stage of 1000 °C ( n < 1), the particle rearrangement had a major influence on the densification. At the late stage of 1050 to 1200 °C (1 < n < 2), the grain boundary diffusion was a significant factor for consolidation, and the activation energy ( n = 1.5) was estimated to be 931.40 kJ/mol. Besides, the microhardness rose with increasing temperatures. The present study laid the groundwork for future research on the fabrication of W-30Si targets by SPS.
研究领域:
材料科学
·
机械工程
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2020
·Vol. 11
·期 1
·31
·
IF 4.324
Qianqian Shen,Yu Zhang,Xuesha Li,Li Xiang,Chaoyin Nie
In order not to sacrifice nitrided layer thickness and reduce brittle compound layer thickness, Ni-coated pretreatment was carried out with electrodeposition on a pure iron surface, followed by gas nitriding. The brittle compound layer thickness of duplex surface treated samples was reduced, and the nitrided layer thickness increased to 320 μm. The microhardness was 4 times harder, and the wear loss was reduced by 68% compared with the original material. The results indicate that Ni-coated pretreatment could effectively improve microhardness and wear resistance and realize the controlled microstructure of a brittle compound layer of pure iron without compromising nitrided layer thickness. Ni coating plays an important role in ammonia adsorption and decomposition, and in the transfer of active nitrogen atoms during nitriding.
研究领域:
材料科学
·
表面工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·Vol. 47
·期 5
·5918-5928
·
IF 3.83
Yu Zhao,Tianqi Zhang,Liaoyuan Chen,Tianbiao Yu,Jiayu Sun,Chuang Guan
In situ Ti(C, N), ring phase, and multi-phase enhanced Ni204-based alloy coating were prepared by adding various Ti/C/TiN ratios particles. The effects of the reinforcement phase on the microstructure, microhardness , tribological property, and microstructure characteristics at the interface between the coating and substrate were investigated. The results show that the coatings with a 5:1 mass fraction ratio of TiN/C exhibits the highest microhardness , which is 3.78 times higher than that of the original Ni204 coating. While, the coating with 21:7:2 mass fraction ratio of TiN/Ti/C exhibits the lowest friction coefficient , which is 4.44 times smaller than that of the original Ni204 coating. The addition of Ti and C particles promotes the precipitation of ring phase and carbides , reduces ceramic agglomeration, alleviates the floating of ceramic particles, and improves the bonding strength of reinforcement phases. Owing to the good mutual solubility among Fe, Ni, and, Cr elements, the diffusion happened at the interface between the coating and substrate.
研究领域:
材料科学
·
表面工程
·
金属学与金属工艺
·
机械工程
·
复合材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）