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Featured researches published by Jianrong Song.


Materials and Manufacturing Processes | 2008

Mechanism of Sintering YAG/ZrB2 Multiphase Ceramics with Spark Plasma Sintering

Jieguang Song; Junguo Li; Jianrong Song; Lianmeng Zhang

Although ZrB2 has some excellent performances, it is difficult to prepare the high relative-density ZrB2 ceramics, which limits the application of ZrB2 materials. To obtain higher relative-density ZrB2 ceramics for increasing the good oxidation resistance, YAG/ZrB2 multiphase ceramics is prepared with the spark plasma sintering, the sintering mechanism of preparing YAG/ZrB2 multiphase ceramic materials is investigated. Al2O3 reacts with Y2O3 to form YAG above 700°C during the sintering process. YAG is filled and melted the space of ZrB2 particles to bind the ZrB2 particles during reaction and sintering process, which increases the density of YAG/ZrB2 multiphase ceramic materials. The YAG/ZrB2 multiphase ceramic materials was successfully prepared under sintering temperature of 1700°C, holding temperature time for 4 min, and sintering pressure of 20 MPa; the density is 5.63 g/cm3, the relative density is 99.78%.


Journal of Reinforced Plastics and Composites | 2007

Synthesis and characterization of Al(OH)3-Y(OH)3-ZrB2 composite particles

Jieguang Song; Lianmeng Zhang; Junguo Li; Jianrong Song

In order to decrease the oxidization and improve the strength of ZrB2 at high temperature, the surface of ZrB2 was coated with Al(OH)3 and Y(OH)3 to synthesize Al(OH)3-Y(OH)3-ZrB2 composite particles. Through TEM, EPMA and SEM analysis, when pH was about 9, Al(OH)3-Y(OH)3-ZrB2 composite particles were successfully synthesized by co-precipitation methods. The coating layer was about 25 nm, which has compaction and conformability. Dispersibility of coated ZrB2 with Al(OH)3 and Y(OH)3 particles were very good. Synthesis of Al(OH)3-Y(OH)3-ZrB2 composite powder will lay the foundation for preparing high-performance YAG/ZrB2 and Al2O3-YAG/ZrB2 multiphase ceramic materials.


Materials and Manufacturing Processes | 2007

Influence of Ultrasonic on the Dispersibility of ZrB2 Particles

Jieguang Song; Lianmeng Zhang; Junguo Li; Jianrong Song

To obtain the better ZrB2/Al(OH)3–Y(OH)3 core-shell composite particles, ZrB2 particles must be adequately dispersed during the coating process. In this article, the dispersibility of ZrB2 particles in the ZrB2 suspension is investigated via the sedimentation method. Through test and analysis, the dispersibility is rapidly increased with prolonging the ultrasonic dispersion time before 10 minutes. After 30 minutes, the sedimentation grads using ultrasonic dispersion basically reach the sedimentation balance, but the grads using mechanical agitating dispersion does not basically change after 5 minutes. The ultrasonic dispersion is one of more effective ways between ultrasonic and mechanical agitating dispersion, the dispersion time for 10 minutes is chosen in the dispersibility of ZrB2 particles via ultrasonic dispersion.


Surface Review and Letters | 2007

THERMODYNAMIC AND KINETIC ANALYSES OF SYNTHESIZING ZrB2@Al(OH)3–Y(OH)3 CORE–SHELL COMPOSITE PARTICLES

Jieguang Song; Lianmeng Zhang; Junguo Li; Jianrong Song

ZrB2 has some excellent performances, but it is easily oxidized at high temperatures to impact the high-temperature strength, which restricts its applied range. To protect from the oxidization and improve the strength of ZrB2 at high temperature, the surface of ZrB2 particles is coated with the Al(OH)3–Y(OH)3 shell to synthesize ZrB2@Al(OH)3–Y(OH)3 core–shell composite particles. Through the thermodynamic and kinetic analyses of the heterogeneous nucleation and homogeneous nucleation, the concentration product of precursor ion (Y3+ or Al3+) and OH- (Qi) must be greater than the solubility product (Ksp), respectively; the conditions of Y3+ and Al3+ are reached to produce Al(OH)3–Y(OH)3 shell on the ZrB2 surface between the Y3+ line and the AlO2- line. Through TEM and XRD analyses, ZrB2@Al(OH)3–Y(OH)3 core–shell composite particles are successfully synthesized by the co-precipitation method, the shell layer quality is better at pH = 9, which established the foundation for preparing high-performance YAG/ZrB2 and Al2O3–YAG/ZrB2 multiphase ceramic materials.


Surface Review and Letters | 2007

INTRODUCTION OF COATING TECHNOLOGY OF SUPERFINE PARTICLE SURFACE

Jieguang Song; Lianmeng Zhang; Junguo Li; Jianrong Song

With the fast development of new materials investigation, attention is paid to. The performance of superfine powders, which must be modified on the surface to acquire some points. Coating technology of particles is one especial method of surface modification. In this paper, coating methods of particles are classified into solid state, liquid state, and gaseous state, main methods and mechanisms during current time are reviewed, respectively, and some research examples are listed. The choice of diversified coating technologies is decided synthetically based on powder materials, performance of the modified substance, and application of coated powders. In the future, the researches of the core-shell modification mechanism, coated particles with an ordered arrangement coating layer, a new surface active agent, the facilities of suiting surface modification, and the evaluation methodology of the surface coating effect are very exigent and necessary for the preparation and application of superfine powders.


Surface Review and Letters | 2007

INFLUENCE OF SYNTHESIS CONDITIONS ON Al(OH)3–Y(OH)3/ZrB2 COMPOSITE PARTICLES

Jieguang Song; Lianmeng Zhang; Junguo Li; Jianrong Song

Although Zirconium diboride (ZrB2) is a desirable combination with some good properties, it is easily oxidized in the high-temperature air to impact high-temperature properties, which dwindles the applied range. In order to decrease oxidization and improve the high-temperature properties of ZrB2, the surface of ZrB2 is coated with Al(OH)3–Y(OH)3 to synthesize Al(OH)3–Y(OH)3/ZrB2 composite particles. In this paper, the conditions of synthesizing Al(OH)3–Y(OH)3/ZrB2 composite particles by the co-precipitation method are investigated. Al(OH)3–Y(OH)3/ZrB2 composite particles are synthesized under different conditions, but the conditions of synthesizing Al(OH)3–Y(OH)3/ZrB2 composite particles with the better coating quality require pH = 9, the appropriate concentration (Al3+ = 0.017 mol/L, Y3+ = 0.01 mol/L) of composite solution, reaction time of 60 min, titration speed of 0.05 ml/s, using the dispersant in the ZrB2 suspension and the ultrasonic dispersion, respectively.


Journal of Dispersion Science and Technology | 2007

Effect of Conditions on the Dispersibility of ZrB2 Particles

Jieguang Song; Lianmeng Zhang; Junguo Li; Jianrong Song

ZrB2@A1(OH)3‐Y(OH)3 core‐shell composite particles are synthesized by co‐precipitation method for strengthening the antioxidation of ZrB2 at high temperature. To reach better A1(OH)3‐Y(OH)3 composite shell and higher coating ratio on the ZrB2 particles surfaces, ZrB2 particles must be adequately dispersed in the ZrB2 suspension during the coating process. The dispersibility of ZrB2 particles under different conditions is investigated by the sedimentation method. Through test and analysis, the optimum conditions of the dispersibility of ZrB2 particles in the ZrB2 suspension are sedimentating for 15 minutes, ultrasonic dispersion for 10 minutes, the lower ZrB2 concentration, pH=9, the dispersant content for the 2% volume of ZrB2 suspension, and using the polyelectrolyte dispersant, respectively.


Synthesis and Reactivity in Inorganic Metal-organic and Nano-metal Chemistry | 2006

Mechanism of Synthesizing Al(OH)3‐Y(OH)3‐ZrB2 Composite Particles

Jieguang Song; Lianmeng Zhang; Junguo Li; Jianrong Song

To decrease the oxidation and improve the strength of ZrB2 at high temperatures, the surface of ZrB2 is coated with Al(OH)3 and Y(OH)3, which results in the production of Al(OH)3‐Y(OH)3‐ZrB2 composite particles. The pH value through analysis of theory and calculation must be greater than 8.3 provided that Al(NO3)3 and Y(NO3)3 both reached the saturated concentration of heterogeneous nucleation or homogeneous nucleation to co‐precipitation of Y3+ and Al3+ precursors on the surface of ZrB2 particles. When pH is 9, Al(OH)3‐Y(OH)3‐ZrB2 composite particles are synthesized successfully and the best coating quality with Al(OH)3 and Y(OH)3 by co‐precipitation method, which established the foundation for preparing high‐performance YAG/ZrB2 and Al2O3‐YAG/ZrB2 multiphase ceramic materials.


Surface Review and Letters | 2007

EFFECT OF COATING CONTENT ON THE PROPERTIES OF A1(OH)3–Y(OH)3/ZrB2 COMPOSITE PARTICLES

Jieguang Song; Lianmeng Zhang; Junguo Li; Jianrong Song

Zirconium diboride is widely applied to high-temperature materials, but it is easily oxidized at high temperature. To increase the oxidation resistance of zirconium diboride at high temperature, the A1(OH)3–Y(OH)3 is coated on the ZrB2 surface to prepare A1(OH)3–Y(OH)3/ZrB2 composite particles. In this paper, the effect of coating content on the properties of A1(OH)3–Y(OH)3/ZrB2 composite particles is investigated. It is analyzed that the particle size and particle size distribution of A1(OH)3–Y(OH)3/ZrB2 composite particles is increased with the coating content. The dispersion of ZrB2 particles is largely increased with the coating content of 0%–20%; the dispersion of ZrB2 particles is similar when the coating content is from 20% to 30%. The oxidation resistance ratio of the ZrB2 particles with 30% coating content is the best than that of other conditions—it is about three times more than that of the original ZrB2 particles.


Surface Review and Letters | 2007

OXIDATION RESISTANCE MECHANISM OF ZrB2–Al2O3–Y2O3 COMPOSITE PARTICLES

Jieguang Song; Junguo Li; Jianrong Song; Lianmeng Zhang

Although ZrB2 has some excellent performances, it is easily oxidized in the high-temperature air, which is deadly shortcoming as high-temperature materials. To increase the high-temperature performances of ZrB2, Al2O3 and Y2O3 particles are coated on the ZrB2 surface to prepare ZrB2–Al2O3–Y2O3 composite particles. The oxidation resistance mechanism of ZrB2–Al2O3–Y2O3 composite particles is investigated by DTA-TG, TEM, and XRD. The surface of ZrB2 particle is coated with compact Al2O3 and Y2O3 particles, which establishes the foundation to attain good oxidation resistance. ZrB2 particle is mainly oxidized to increase the weight, from 600°C to 800°C. B2O3, obtained through the oxidization reaction, might coat on the surface of ZrB2 particle to retard the oxidization reaction, which further increases the oxidation resistance. The oxidation resistance of coated ZrB2 particle is far better than that of original ZrB2 particle.

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Jieguang Song

Wuhan University of Technology

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Junguo Li

Wuhan University of Technology

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Lianmeng Zhang

Wuhan University of Technology

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Qiang Shen

Wuhan University of Technology

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