CONSTRUCTION AND BUILDING MATERIALS
·
2022
·
IF 7.693
Kairong Jin,Wanli Bi,Yan Guan,Xiaoyang Chen,Xiangming Zhou,Dezhi Wang
Salt erosion is one of the main factors affecting the durability of cement and concrete. Magnesium oxysulfate (MOS) cement is regarded as a new type of binder with many good features such as lower carbon dioxide emission, excellent fire resistance, etc. However, the salt erosion resistance of MOS cement is rarely studied. This research investigated the performance of MOS cement, with granite powders (GPs) as mineral admixture , soaked in NaCl and Na 2 SO 4 solutions. X-ray diffraction (XRD) and simultaneous comprehensive thermal analyzer (TG-DSC) were used to detect the phase composition and hydration products of MOS cement. Scanning electron microscope (SEM) and mercury porosimeter (MIP) were used to analyze the pore structure and microstructure of MOS cement. The results showed that the value of the salt attack coefficient of MOS cement with 50 % by weight GPs reached 0.58 and 0.57 after immersion in NaCl and Na 2 SO 4 solutions for 230 days, respectively. The compressive strength of MOS cement with 30 % by weight GPs reached the maximum value of 74.1 MPa after standard curing for 28 days by optimizing the pore structure. Both needle-like and plate-like Na 2 SO 4 ·xH 2 O crystals were observed in the hydration products. Gypsum and Na 2 SO 4 ·xH 2 O grew in the pores and matrix, generated expansion stress and destroyed the matrix structure of MOS cement. During the soaking period, the decomposition of the 5·1·7 phase and MgSO 4 ·nH 2 O negatively affected the salt resistance of MOS cement. Physical and chemical erosion leads to a decrease in the value of the salt attack coefficient.
研究领域:
建筑材料学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2023
·
IF 7.4
Xing Cao,Weichen Yang,Shiwei Liu,Lin Fang,Runjie Liu,Rui Ma
To evaluate the feasibility and safety of municipal solid waste incineration fly ash (MSWIFA)-based geopolymer, its durability against water, 3% Na 2 SO 4 , 1% H 2 SO 4 and 3% H 2 SO 4 for 112 days was investigated. Results showed that H 2 SO 4 resistance of MSWIFA-based geopolymers was weaker than that of Na 2 SO 4 and deteriorated with increasing MSWIFA incorporation and H 2 SO 4 concentration. Under H 2 SO 4 erosion, CaCO 3 or C-A-S-H gels formed CaSO 4 ·2H 2 O, and this decalcification process caused cracks formation. Dealumination disrupted the electrostatic interaction of [AlO 4 ] - and Al-O coordination, reducing the solidification efficiency of Zn and Pb significantly. Conversely, Cu and Cr with Si-O coordination exhibited greater than 70% solidification efficiency.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2024
·
IF 11.2
Taixin Liang,Jiaxin Lu,Fei Xiao,Hua Guo,Chunzhi Li,Mukun He,Baosheng Liu,Zeinhom M. El-Bahy,Nawaa Ali H. Alshammari,Xin Liao,Salah M. El-Bahy,Zhongliang Xiao,Zhanhu Guo
Low erosion high-energy propellant is one of the research directions to extend the weapon's life and improve the weapon's capability. In this study, energetic propellants containing different corrosion inhibitors were designed and prepared. Close bomb tests and semi-confined bomb experiments were used to investigate the burning and erosion properties of the propellants. The mechanism of erosion-reducing of titanium dioxide (titania, TiO 2 ), talc, and octaphenylsilsesquioxane (OPS) on the propellant was comparatively analyzed. The results show that OPS has the lowest burning rate and the longest burning time, and a minimized loss of fire force, with the best effect of explosion heat reduction. The erosion reduction efficiency of OPS is twice that of TiO 2 and talc. The mechanism analysis shows that the decomposition and heat absorption of OPS can effectively reduce the thermal erosion effect and carbon erosion, and the gas produced can reduce the loss of chamber pressure and form a uniformly distributed nano-SiO 2 protective layer. This solid-state high-efficiency organosilicon erosion inhibitor is an important guide for designing high-energy low-erosion gun propellants.
研究领域:
材料科学
·
弹道学
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2022
·Vol. 14
·期 2
·322
·
IF 4.967
Hong Qi,Qingshan Shi,Yuhai Qian,Yueming Li,Jingjun Xu,Caihong Xu,Zheng Zhang,Xiaobao Xie
In this work, the atomic oxygen (AO) erosion-resistance effect and mechanism of the Perhydropolysilazane (PHPS) coating were investigated from the perspective of element distribution in the depth direction. The results revealed that the coating demonstrated good adhesion and intrinsic AO erosion-resistance, which was attributed to the composition gradient formed in the coating. Moreover, the oxygen ratio of the SiOx on top layer of the coating could be elevated during AO exposure, strengthening the Ar ion etching durability of the coating. According to these results, an AO erosion-resistance mechanism model of the PHPS-derived SiOx coating was finally obtained.Keywords:PHPS;silica coating;atomic oxygen;erosion-corrosion;resistance mechanism
研究领域:
材料科学
·
航天工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemistrySelect
·
2025
·Vol. 10
·期 5
·e202405511
·
IF 2
Lu Shen,Yingxuan Wang,Miaomiao Lu,Chengbo Ni,Pengfei Zhou,Liping Zhao
Graphical Silk fibroin modified CF (CF–SF) was acted as a reinforced additive to enhance the corrosion resistance and anti-erosion properties via improving the interfacial adhesion between CFs and resin matrix. The exceptional protective coating can extend the service life of the equipment in a severe marine environment. Carbon fibers (CFs), characterized by high tensile strength, elastic modulus, and excellent chemical resistance, serve as an appropriate filler for coating reinforcement. However, the inadequate fiber/matrix interfacial adhesion makes it difficult to prepare high performance CF-reinforced composites. Therefore, we synthesized a kind of silk fibroin modified CF (CF─SF) as a reinforced-additive for strengthening the corrosion resistance and anti-erosion properties via improving the interfacial adhesion between CFs and resin matrix. The impedance value of composite coating including 1 wt% CF—SF (CF—SF/EP) was 1.65 × 108 Ωˑcm 2 after immersion, which was two orders of magnitude greater than that of the pure EP coating. In addition, the erosion experiments results showed that the volume loss of EP/CF—SF coating was 132.6 mm 3 , which decreased by 36.4% and 17.4% compared with EP/CF and EP/CF─O, respectively. The average depth of the CF—SF/EP coating (0.27 mm) was the shallowest among the coatings. Ultimately, we examined the protective mechanism of the CF–SF/EP coating.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Guihong Han,Zhixiao Wang,Bingbing Liu,Yanfang Huang,Shengpeng Su
Existing refractory-life-extending technologies had concentrated on the preparation of homogeneous high-performance refractory materials in advance. In this paper, an in situ anti-erosion approach of conventional corundum-mullite refractory material was proposed for the incineration of hazardous spent high-salt organic liquor, in which the powdery additives were directly added into the spent liquor. The phase transformation, interfacial morphology evolution, and pore distribution of the corundum-mullite refractory with and without Cr 2 O 3 /ZrO 2 addition were compared, and the in situ anti-erosion mechanism was determined via the XRD , SEM, XPS , mercury intrusion porosimetry , and thermodynamic analyses. In conventional corrosion, molten Na 2 SO 4 , the primary phase of incinerating slag, directly entered the interior of the corundum-mullite refractory through pores on the interface. The Na 2 SO 4 strongly reacted with alumina and silica at 1000–1300 °C to produce liquid albite and nepheline. Upon the addition of Cr 2 O 3 into the spent liquor, the Cr 2 O 3 powder was suspended in the spent liquor and deposited at the refractory interface to form a protective (Al,Cr) 2 O 3 solid solution layer with Al 2 O 3 . The dense corrosion-resistant layer of (Al,Cr) 2 O 3 with a depth of 0–3 mm on the surface of the firebricks seldom reacted with molten Na 2 SO 4 . This protective layer can effectively slow down the penetration and erosion of incinerating slag. The environmental risks of Cr(VI) contamination associated with the Cr 2 O 3 addition in the incineration process were also evaluated in this work. Eventually, preliminary trial operation results showed that the service life of the corundum-mullite firebrick was prolonged after 5% Cr 2 O 3 addition into the spent liquor.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
Coatings
·
2023
·Vol. 13
·期 2
·252
·
IF 3.4
Yunzhang Li,Meng Zhou,Yi Zhang,Hanjing Zhu,Xianhua Zheng,Shengli Liang,Shunlong Tang,Baohong Tian,Yong Liu,Xu Li,Alex A. Volinsky,Chenglin Zheng
With the massive penetration of electronics into human life, higher demands are placed on electrical contacts. Among them, the lifetime of electrical contacts and safety are the most concerning. In this research, Al2O3-Cu/25Mo5Ta and 0.5Y2O3/Al2O3-Cu/25Mo5Ta composites were prepared by using ball milling and powder metallurgy methods. The two composites were subjected to 10,000 contact opening and closing electrical contact experiments and the arc duration and arc energy were analyzed. The results show that the addition of Y2O3has a slight effect on the mechanical properties of the Al2O3-Cu/25Mo5Ta composites but has a significant effect on the electrical contact performance. Y2O3can reduce the mass loss of the electrical contacts during the electrical contact process, which prolongs their service life. The addition of Y2O3decreased the average arc duration and arc energy of the electrical contact material by 21.53% and 18.02%, respectively, under the experimental conditions of DC 30 V, 10 A. TEM results showed that nanoscale YTaO4with excellent thermal stability was generated during the sintering process, which has a positive effect on the electrical contact performance of the composites.Keywords:copper matrix composites;electrical contact;arc erosion behavior;yttrium tantalate
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
FIBERS AND POLYMERS
·
2025
·
IF 2.3
Zhang Sheng,Wu Bingjie,Song Bo,Chen Tao,Li Qing,Wu Guangshun,Chen Lei
When a spacecraft works in low earth orbit, PBO fiber/epoxy resin composite as structural material not only has the poor interfacial properties, but also faces the attack of atomic oxygen (AO). To solve the two drawbacks, a PBO fiber hierarchical reinforcement has been fabricated without degrading the fiber by a mussel-inspired "two-step" method based on dopamine (DA) assistant co-deposition and chemical grafting technologies. The surface wettability, roughness (Ra) and reactivity of the obtained PBO@PDA-Si-GO are increased significantly in comparison with those of untreated one. The reinforcement offered simultaneously remarkable enhancement in interfacial shear strength (IFSS) and AO erosion resistance of the composites, which laid theoretical and experimental foundations for the realization of the structure/function integration design of advanced composites.
研究领域:
材料科学
·
航天工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PROSTHETIC DENTISTRY
·
2023
·
IF 4.6
Yaoxin Wang,Zijing Chang,Ning Ding,Zutai Zhang
Statement of problem Secondary caries is a major factor in the failure of dental restorations . However, studies on the fabrication of acid-resistant and antibacterial dentin to improve dentin bonding are sparse. Purpose The purpose of this in vitro study was to compare the effects of 2 types of fluoride-containing etchants on dentin bonding and explore the feasibility of formulating an altered dentin substrate to improve dentin bonding. Material and methods NaF-containing and SnF 2 -containing etchants were developed by adding sodium fluoride and stannous fluoride to a 35% phosphoric acid aqueous solution. Two groups (N1 and N2) containing NaF, 10 and 30 mg/mL respectively, and 2 groups (S1 and S2) containing SnF 2, 18.6 and 55.8 mg/mL respectively, were formulated. The etchant of the control group (C) was 35% phosphoric acid gel. Scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), Fourier transform infrared spectroscopy (FTIR), microhardness, antierosion, and antibacterial tests were performed on the treated dentin. Moreover, the microtensile bond strength (µTBS) of each group was tested, and the fracture mode was determined after testing. Statistical analysis was performed with the 2-way ANOVA test (α=.05). Results The exposed collagen fiber was observed in group C, and minerals were formed on the dentin in the experimental groups. SEM, FTIR, and the microhardness test indicated more remineralization in the SnF 2 -containing etchant groups. The µTBS of S1 (77.5 ±10.36 MPa) was the highest in all groups, and group C (38.5 ±9.01 MPa) was the lowest. Moreover, the antierosion and antibacterial properties of the S2 group were the best among all groups ( P <.05). Conclusions Compared with NaF-containing etchant, SnF 2 -containing etchant could improve the dentin substrate, increase remineralization, improve bonding strength, and enhance antibacterial ability, especially by increasing resistance to acid erosion.
研究领域:
牙科学
·
材料科学
·
生物医学工程
✓ 已验证
DOI
PubMed
高影响因子
PROPELLANTS EXPLOSIVES PYROTECHNICS
·
2017
·Vol. 42
·期 11
·1252-1260
·
IF 1.908
Na Sun,Zhenggang Xiao
A nanocomposite microsphere consisting of solid paraffin, nano-TiO 2 , nano-BN, zeolitic imidazolate framework-67 particles and polymethyl methacrylate was prepared and applied as a functional additive for high energy propellants (with about 23 wt % RDX) to reduce the barrel erosion and improve its combustion performance as well. High energy propellants modified with the nanocomposite were manufactured by a solvent extrusion technique. According to the scanning electron microscope and differential scanning calorimetry results, there exists a good compatibility between the nanocomposite and propellant matrix. The energy and combustion performance as well as erosion of the modified propellants were studied by a closed bomb test and an erosion tube device, respectively. Results showed that compared with the unmodified propellant, both the erosion and energy performance of modified high energy propellant gradually decreased with the increase of nanocomposites contents. When the content of nanocomposites was 5.1 %, the erosion mass of the modified propellant reduced to 37.0 % while the propellant force only decreased 5.7 %, indicating that the nanocomposite has enormous ability to improve gun erosion resistance while barely affect energy performance of propellant. Furthermore, the closed bomb burning curves of the samples showed that addition of nanocomposites to propellant matrix could prolong the combustion time, efficiently inhibit the initial generation rate of combustion gas, and further achieve the progressive burning of the propellants.
研究领域:
材料科学
·
燃烧学
·
推进剂工程
✓ 已验证
产品关联
DOI
高影响因子
Water
·
2023
·Vol. 15
·期 8
·1525
·
IF 3.4
Rui Ding,Ziyu Wang,Xiangyu Zhao,Peng Cao,Xin Chen,Wenjing Chen
Coastal erosion is increasing worldwide due to the increasing frequency of extreme natural phenomena and excessive human exploitation. In this study, a small model experiment was conducted to investigate the solidification effects of three enzyme sources—soybean urease, freshwaterBacillus pasteurella, and seawater domesticatedBacillus pasteurella—on coastal sediments and their impacts in a seawater environment. The solidifying effect of different enzyme sources was determined by measuring the mechanical properties and corrosion resistance of the cured specimen model. The influence of solidified seawater in a seawater environment was obtained by measuring the changes in the pH value, calcium ion concentration, and ammonia nitrogen content of solidified seawater. The results show that different enzyme sources have a certain strengthening effect on coastal sediments. The mechanical properties of coastal sediments can be enhanced by increasing the amount of enzyme solution or level of solidification and can effectively resist simulated flow erosion. Comparing the reinforcement effects of different enzyme sources, it can be seen. It was observed thatBacillus pasteurellaacclimated in seawater had better reinforcement effects thanBacillus pasteurellafresh water, andBacillus pasteurellafresh water had better reinforcement effects than soybean urease. In the seawater measurement tests, the solidification of coastal sediments using different enzyme sources led to a decrease in the seawater pH value, and the acidification of seawater dissolved the generated calcium carbonate, increased the concentration of calcium ions in seawater, and produced ammonia nitrogen as a byproduct in the seawater. It was observed that, compared with the other two enzyme source solutions, the seawater-domesticatedBacillus pasteurellacan better adapt to the high-salt environment of seawater, microbial metabolism is not inhibited, urea decomposition ability is improved, and calcium carbonate production is higher, which can effectively improve the engineering characteristics of coastal sediments and play a positive role in coastal protection and development.
研究领域:
海洋生物学
·
环境科学
·
土木工程
✓ 已验证
产品关联
DOI
高影响因子
TRIBOLOGY INTERNATIONAL
·
2023
·
IF 6.2
Yongzhi Jing,Yongchao Fang,Xiufang Cui,Zhuo Chen,Dianchao Liu,Anying Liu,Xinhe Wang,Qicheng Li,Guo Jin,Haoliang Tian
Lanthanum zirconate coatings (La 2 Zr 2 O 7 , LZ) have a high Poisson’s ratio and low fracture toughness , making it indescribable for long service life at high temperatures. Rare earth doped lanthanum zirconate (RE-LZ) is an effective way to improve its mechanical properties . In this study, the lanthanum zirconate ceramic coating modified by binary rare earth ((La 1/3 Gd 1/3 Y 1/3 ) 2 Zr 2 O 7 , LGYZ; and (La 1/3 Sm 1/3 Yb 1/3 ) 2 Zr 2 O 7 , LGYZ) and multi-principal rare earth modified ((La 1/5 Gd 1/5 Y 1/5 Sm 1/5 Yb 1/5 ) 2 Zr 2 O 7 , HEC-LZ) was studied, aiming to improve the intrinsic mechanical properties of lanthanum zirconate ceramic coating. By comparing the mechanical properties such as fracture toughness, bonding strength , microhardness dissipation parameter, and solid erosion properties of various types of coatings, the results show that compared with binary rare earth modified coatings such as LGYZ and LSYZ, the elastic modulus of the HEC-LZ ceramic coating is reduced by 4.7–6.3%, the microhardness dissipation parameter (MDP) is increased by 4.8–10.2%, and the fracture toughness is increased by 5.2–7.4%. The HEC-LZ ceramic coating showed favorable toughness and crack resistance. Regarding the erosion resistance of the coatings, the ability of RE-LZ coatings is significantly better than that of LZ coatings, and the erosion rate at 45° and 90° is reduced by 44.9–66.0% and 45.7–62.9%, respectively.
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
危险品化学品经营许可证（带存储）