The Experts below are selected from a list of 333 Experts worldwide ranked by ideXlab platform

Wang Yongguang - One of the best experts on this subject based on the ideXlab platform.

  • improving tribocorrosion performance of Chemically Bonded Ceramic phosphate coating reinforced by go zno
    Ceramics International, 2021
    Co-Authors: Liu Yaxuan, Guo Yongxin, Zhao Yongwu, Aradhyula Thirumala Vasu, Tang Hao, Wang Yongguang
    Abstract:

    Abstract To enhance the tribocorrosion properties of Chemically Bonded phosphate Ceramic coating (CBPCC), GO-ZnO was prepared and added into CBPCC. And the tribocorrosion behaviour of CBPCC was investigated. Results show that, with the introduction of GO-ZnO, the open circuit potential of CBPCC shifts in a positive direction and corrosion current density decreases. In addition, the total material loss, the total mechanical wear loss and the total electrochemical corrosion loss of CBPCC all decrease with the increase of GO-ZnO. The wear track of CBPCC after tribocorrosion without GO-ZnO is rough and porous, while the wear track becomes smooth and dense with the incorporation of GO-ZnO. The material in wear track is anchored by GO-ZnO due to the strong bond between GO-ZnO and CBPCC, which decreases the wear loss. Because of the extra force from the tribocorrosion experiment, the material anchored by GO-ZnO forms to a dense structure which prevents electrolyte diffusion into CBPCC. Moreover, GO-ZnO can block the electrolyte diffusion pathway and make it more tortuous. The resistance to the electrolyte diffusion decreases the corrosion current density and the increased wear loss due to electrochemical corrosion.

  • mechanical behaviour of graded Chemically Bonded Ceramic coating
    Surface Engineering, 2021
    Co-Authors: Guo Yongxin, Liu Yaxuan, Wang Yongguang, Zhao Yongwu
    Abstract:

    To investigate the mechanical behaviour of graded Chemically Bonded Ceramic coating, four types of Ceramic coatings were prepared in this study, and a graded coating was designed using the four coa...

  • influence of go al2o3 hybrid material on the tribological behavior of Chemically Bonded Ceramic coating
    Ceramics International, 2020
    Co-Authors: Guo Yongxin, Liu Yaxuan, Zhao Yongwu, Aradhyula Thirumala Vasu, Wang Yongguang
    Abstract:

    Abstract GO-Al2O3 hybrid material was prepared to enhance the bond strength between GO and Chemically Bonded Ceramic coating (CBCC). TEM and FTIR results indicate that nano Al2O3 is successfully grafted to the surface of GO via chemical bonds. Besides, the tribological behavior of CBCC with GO-Al2O3 hybrid material was investigated. The results show that the friction coefficient and wear rate of CBCC decrease with the introduction of GO-Al2O3 hybrid material. In addition, the formation of debris becomes difficult as the cohesive strength of CBCC increases with the introduction of GO-Al2O3 hybrid material, which can improve the wear resistance of CBCC. Furthermore, because less debris on the worn surface makes bigger real contact surface against the counter ball than that of CBCC without GO-Al2O3 hybrid material, the contact stress obviously decreases, contributing to high wear resistance.

  • tribological behavior of graphene reinforced Chemically Bonded Ceramic coatings
    Ceramics International, 2020
    Co-Authors: Xu Rongli, Guo Yongxin, Liu Yaxuan, Zhao Yongwu, Thirumala Vasu Aradhyula, Wang Yongguang
    Abstract:

    Abstract To investigate tribological behavior of graphene reinforced Chemically Bonded Ceramic coatings at different temperatures, tribological tests at room temperature, 200 °C and 500 °C were carried out. Results show that the fracture toughness and the hardness of the coating are improved with the introduction of graphene. Besides, the friction coefficient of the coating decreases with the addition of graphene at the room temperature and 200 °C. The coating without graphene achieves the similar friction coefficient at all temperatures. However, the coating with graphene achieves the lowest friction coefficient at 200 °C, and achieves the highest at 500 °C. In addition, the wear rate of the coating decreases with the increase of graphene. Besides, the wear rate at 200 °C is almost similar with that at room temperature. In contrast, the wear rate at 500 °C is much larger than those at room temperature and 200 °C. The mechanisms for graphene to decrease the friction coefficient and improve the wear resistance of Chemically Bonded Ceramic coatings at evaluated temperatures are clarified.

Zhu Ding - One of the best experts on this subject based on the ideXlab platform.

  • properties of a magnesium phosphate cement based fire retardant coating containing glass fiber or glass fiber powder
    Construction and Building Materials, 2018
    Co-Authors: Yuan Fang, Peng Cui, Zhu Ding, Jixiang Zhu
    Abstract:

    Abstract Magnesium phosphate cement (MPC) is a type of Chemically-Bonded Ceramic and has excellent resistance to high temperatures. In this study, the properties of the MPC as a fire-retardant coating were evaluated to expand the application of the MPC. The MPC coating was prepared by blending with glass fiber (GF) or glass fiber powder (GFP) as a mineral admixture (the content was 0%, 2%, 4%, and 6%). The physical and mechanical performances of the MPC pastes were tested and their fire retardancy was investigated in detail. The results showed that the spread fluidity values of the GFP-blended MPC pastes were higher than 200 mm and the initial setting time exceeded 60 min. The bonding strength values of all MPC specimens were greater than 0.6 MPa. The tests results showed that the MPC coating had excellent fire retardancy. During a fire, the free water in the MPC paste and the Chemically-Bonded water in the hydrate product (struvite of potassium) of the MPC dissipated a large amount of heat, which effectively retarded the spread of the fire. At the same time, the glass fiber and glass fiber powder played an important role in preventing cracks in the MPC coating during the fire retardancy test. With the aid of micro-analyses, such as thermo-gravimetric and differential thermal analysis (TG-DTA), X-ray diffractometer analysis (XRD), and optical micrograph observations, the causes for the excellent fire retardancy of the MPC coating were determined.

  • cementing mechanism of potassium phosphate based magnesium phosphate cement
    Ceramics International, 2012
    Co-Authors: Zhu Ding, Feng Xing, Biqin Dong, Ningxu Han
    Abstract:

    Magnesium phosphate cements (MPCs) are materials that belong to Chemically Bonded Ceramic materials. They have a wide range of potential applications, due to their superior performance. In this paper, the reaction products and cementing mechanism of magnesium phosphate Bonded cement based on the dead burned magnesia and the mono-potassium phosphate (MPP) are investigated. Fine powder and grains of dead burned magnesia were used to prepare pure cement paste and bonding cluster samples, respectively. The cement reaction products and their micro-morphology in the both different samples are examined. The microstructure of specimens is analyzed by SEM, TEM, XDR, and optical microscopy. Struvite of potassium (MgKPO4·6H2O) is observed in the reaction products. According to the analysis, it is found that struvite exists in both crystalline and amorphous form. There is also residual magnesia in the hardened cement paste. By means of microscopy observation, it can be seen that reaction products form around the unreacted magnesia and can develop into a continuum structure, which further produces the hardened paste. Struvite can grow up to form the more perfect crystal in a long term curing age, if large enough space is available during the hydration process.

Yingru Fan - One of the best experts on this subject based on the ideXlab platform.

  • mechanical properties of basalt fiber reinforced magnesium phosphate cement composites
    Construction and Building Materials, 2018
    Co-Authors: Jihui Qin, Jueshi Qian, Chao You, Xiaobing Dai, Yanfei Yue, Yingru Fan
    Abstract:

    Abstract Magnesium phosphate cements (MPCs) have found a wide range of applications due to their superior properties. However, as a Chemically Bonded Ceramic material, MPCs show highly brittle behavior. Fiber inclusion is a simple and effective way to improve their ductility and toughness. In this study, short discrete basalt fibers with different fiber contents by mixture volume (i.e. 0–1.5%) and lengths (i.e. 6 mm–30 mm) were added into MPC matrix. Properties of basalt fiber reinforced MPC composites (BFRMPCs) including workability, compressive, splitting tensile, flexural and post-peak residual strengths, and toughness were assessed. The fracture surfaces of BFRMPC samples were also investigated by using scanning electron microscopy (SEM). The results revealed that the addition of basalt fibers into MPC mixture led to a significant decrease in workability and a slight decrease in bulk density. The beneficial effect of basalt fibers on compressive strength began to weaken after 1% of fiber volume, while splitting tensile strength, flexural strength, and fracture toughness significantly increased with the increase of fiber volume. Moreover, the load-deflection behavior was highly related to the fiber content and testing age. In addition, the effect of basalt fiber lengths on the properties of MPC mixtures was insignificant. The results also suggested that basalt fiber reinforced MPCs showed better mechanical properties than glass fiber reinforced MPCs.

Ningxu Han - One of the best experts on this subject based on the ideXlab platform.

  • cementing mechanism of potassium phosphate based magnesium phosphate cement
    Ceramics International, 2012
    Co-Authors: Zhu Ding, Feng Xing, Biqin Dong, Ningxu Han
    Abstract:

    Magnesium phosphate cements (MPCs) are materials that belong to Chemically Bonded Ceramic materials. They have a wide range of potential applications, due to their superior performance. In this paper, the reaction products and cementing mechanism of magnesium phosphate Bonded cement based on the dead burned magnesia and the mono-potassium phosphate (MPP) are investigated. Fine powder and grains of dead burned magnesia were used to prepare pure cement paste and bonding cluster samples, respectively. The cement reaction products and their micro-morphology in the both different samples are examined. The microstructure of specimens is analyzed by SEM, TEM, XDR, and optical microscopy. Struvite of potassium (MgKPO4·6H2O) is observed in the reaction products. According to the analysis, it is found that struvite exists in both crystalline and amorphous form. There is also residual magnesia in the hardened cement paste. By means of microscopy observation, it can be seen that reaction products form around the unreacted magnesia and can develop into a continuum structure, which further produces the hardened paste. Struvite can grow up to form the more perfect crystal in a long term curing age, if large enough space is available during the hydration process.

Liu Yaxuan - One of the best experts on this subject based on the ideXlab platform.

  • improving tribocorrosion performance of Chemically Bonded Ceramic phosphate coating reinforced by go zno
    Ceramics International, 2021
    Co-Authors: Liu Yaxuan, Guo Yongxin, Zhao Yongwu, Aradhyula Thirumala Vasu, Tang Hao, Wang Yongguang
    Abstract:

    Abstract To enhance the tribocorrosion properties of Chemically Bonded phosphate Ceramic coating (CBPCC), GO-ZnO was prepared and added into CBPCC. And the tribocorrosion behaviour of CBPCC was investigated. Results show that, with the introduction of GO-ZnO, the open circuit potential of CBPCC shifts in a positive direction and corrosion current density decreases. In addition, the total material loss, the total mechanical wear loss and the total electrochemical corrosion loss of CBPCC all decrease with the increase of GO-ZnO. The wear track of CBPCC after tribocorrosion without GO-ZnO is rough and porous, while the wear track becomes smooth and dense with the incorporation of GO-ZnO. The material in wear track is anchored by GO-ZnO due to the strong bond between GO-ZnO and CBPCC, which decreases the wear loss. Because of the extra force from the tribocorrosion experiment, the material anchored by GO-ZnO forms to a dense structure which prevents electrolyte diffusion into CBPCC. Moreover, GO-ZnO can block the electrolyte diffusion pathway and make it more tortuous. The resistance to the electrolyte diffusion decreases the corrosion current density and the increased wear loss due to electrochemical corrosion.

  • mechanical behaviour of graded Chemically Bonded Ceramic coating
    Surface Engineering, 2021
    Co-Authors: Guo Yongxin, Liu Yaxuan, Wang Yongguang, Zhao Yongwu
    Abstract:

    To investigate the mechanical behaviour of graded Chemically Bonded Ceramic coating, four types of Ceramic coatings were prepared in this study, and a graded coating was designed using the four coa...

  • influence of go al2o3 hybrid material on the tribological behavior of Chemically Bonded Ceramic coating
    Ceramics International, 2020
    Co-Authors: Guo Yongxin, Liu Yaxuan, Zhao Yongwu, Aradhyula Thirumala Vasu, Wang Yongguang
    Abstract:

    Abstract GO-Al2O3 hybrid material was prepared to enhance the bond strength between GO and Chemically Bonded Ceramic coating (CBCC). TEM and FTIR results indicate that nano Al2O3 is successfully grafted to the surface of GO via chemical bonds. Besides, the tribological behavior of CBCC with GO-Al2O3 hybrid material was investigated. The results show that the friction coefficient and wear rate of CBCC decrease with the introduction of GO-Al2O3 hybrid material. In addition, the formation of debris becomes difficult as the cohesive strength of CBCC increases with the introduction of GO-Al2O3 hybrid material, which can improve the wear resistance of CBCC. Furthermore, because less debris on the worn surface makes bigger real contact surface against the counter ball than that of CBCC without GO-Al2O3 hybrid material, the contact stress obviously decreases, contributing to high wear resistance.

  • tribological behavior of graphene reinforced Chemically Bonded Ceramic coatings
    Ceramics International, 2020
    Co-Authors: Xu Rongli, Guo Yongxin, Liu Yaxuan, Zhao Yongwu, Thirumala Vasu Aradhyula, Wang Yongguang
    Abstract:

    Abstract To investigate tribological behavior of graphene reinforced Chemically Bonded Ceramic coatings at different temperatures, tribological tests at room temperature, 200 °C and 500 °C were carried out. Results show that the fracture toughness and the hardness of the coating are improved with the introduction of graphene. Besides, the friction coefficient of the coating decreases with the addition of graphene at the room temperature and 200 °C. The coating without graphene achieves the similar friction coefficient at all temperatures. However, the coating with graphene achieves the lowest friction coefficient at 200 °C, and achieves the highest at 500 °C. In addition, the wear rate of the coating decreases with the increase of graphene. Besides, the wear rate at 200 °C is almost similar with that at room temperature. In contrast, the wear rate at 500 °C is much larger than those at room temperature and 200 °C. The mechanisms for graphene to decrease the friction coefficient and improve the wear resistance of Chemically Bonded Ceramic coatings at evaluated temperatures are clarified.