The Preparation of Phosphate Bonding Agent and its Application in Ceramic Coating

2013 ◽  
Vol 821-822 ◽  
pp. 1256-1260 ◽  
Author(s):  
Fu Te Lv ◽  
Li Ge Wang ◽  
En Ze Wang
Keyword(s):  
Particle Size ◽  
Metal Matrix ◽  
Ceramic Coating ◽  
Raw Materials ◽  
Curing Temperature ◽  
Bonding Agent ◽  
Molar Ratio ◽  
Main Body ◽  
Phosphate Bonding ◽  
Sic Particle

A kind of phosphate bonding agent was prepared with H3PO4 and Al(OH)3 as the main raw materials in this paper. Phosphate-metal matrix ceramic coating was prepared on the surface of Q235 steel by using the technology of ambient cure with phosphate bonding agent as main body and CuO and SiC as fillers. The influence of the addition of CuO on curing temperature was studied. Meanwhile, the influence of SiC particle size and content on the abrasion resistance of the coating was studied. The result showed that the amount of friction and wear of phosphate-metal matrix ceramic coating was 5.5mg, when the the molar ratio of P and Al was 3:1.3, SiC particle size was D50=18μm, and its particle content was 40%, 20%wt CuO was added.

Mechanical Properties and Wear Behaviour of Al2O3/SiCp Reinforced Aluminium-Based MMCs Produced by the Stir Casting Technique

2013 ◽  
Vol 22 (4) ◽  
pp. 096369351302200 ◽  
Author(s):  
Necat Altinkök
Keyword(s):  
Particle Size ◽  
Tensile Strength ◽  
Wear Resistance ◽  
Metal Matrix ◽  
Aluminium Matrix ◽  
Wear Behaviour ◽  
Matrix Composites ◽  
Particle Reinforcement ◽  
Hybrid Ceramic ◽  
Sic Particle

In this study, initially Al2O3/SiC powder mix was prepared by reacting of aqueous solution of aluminium sulphate, ammonium sulphate and water containing SiC particles at 1200°C. 10 wt% of this hybrid ceramic powder with different sized SiC particles was added to a liquid Al matrix alloy during mechanical stirring between solidus and liqudus under inert conditions. Then hybrid Metal Matrix Composites (MMCs) was produced. The effect of reinforced particle size on tensile strength, bending strength, hardness resistance and wear resistance properties of hybrid reinforced MMCs were investigated. The mechanical test results revealed that bending, tensile strength and hardness resistance of the composites increased with decrease in ductility, with decrease size of the reinforcing SiC particulates in the aluminium alloy metal matrix. The wear behaviour of the hybrid ceramic reinforced aluminium matrix composites was investigated using pin-on-disc test at room temperature under dry conditions. Wear tests showed that the wear resistance of MMCs increased with increasing reinforced Al2O3/SiC particle size. Comparing the fine particle size MMCs with the coarse particle size MMCs were easily pulled out whole from the matrix. Microstructural examination showed that as well as coarse SiC particle reinforcement, a fine alumina particle reinforcement phase was observed within the aluminium matrix (A332).

scholarly journals Effects of SiC Particle Size on Properties of Cu-SiC Metal Matrix Composites

2012 ◽  
Vol 121 (1) ◽  
pp. 251-253 ◽  
Author(s):  
G. Celebi Efe ◽  
I. Altinsoy ◽  
M. Ipek ◽  
S. Zeytin ◽  
C. Bindal
Keyword(s):  
Particle Size ◽  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Matrix Composites ◽  
Sic Particle

scholarly journals Preparation and Properties of Agricultural Residuals-Iron Concentrate Pellets

2017 ◽  
Vol 2017 ◽  
pp. 1-7
Author(s):  
Zhulin Liu ◽  
Xuegong Bi ◽  
Zeping Gao ◽  
Yayu Wang
Keyword(s):  
Particle Size ◽  
Compressive Strength ◽  
Blast Furnace ◽  
Iron Ore ◽  
Raw Materials ◽  
Experimental Results ◽  
Molar Ratio ◽  
Reduction Temperature ◽  
Iron Concentrate ◽  
Reduction Of Iron

In this paper, carbon-containing pellets were prepared by using crop-derived charcoal made from agricultural residuals and iron ore concentrates, and their pelletizing performance and properties were studied. Experimental results showed that the strengths of pellets were related to the particle size of concentrates and the content of moisture, bentonite, and crop-derived charcoal fines in the pelletizing mixture and the temperature of roasting and reduction. That the granularity of raw materials was fine and the bentonite content increased was beneficial to the improvement of pellet strengths. The suitable molar ratio of carbon to oxygen was 1.0 and the proper proportioning ratios of moisture and binder were 8.0% and 6.5%, respectively. The pellet strengths increased accordingly with increasing the reduction temperature, and when the temperature reached 1200°C, accompanied by the fast reduction of iron and the formation of crystal stock, the dropping strength of product pellets was 15 times and the compressive strength was 1650 N; this may be improved by grinding of the concentrate, leading to acceptable strength for the blast furnace.

The Research of by Blend and Flux Method SrFe12O19 Magnetic Particle Preparation and Magnetic Properties

2010 ◽  
Vol 160-162 ◽  
pp. 1513-1517
Author(s):  
Wei Guo ◽  
Hang Wu ◽  
Zhen Zhong Zheng ◽  
Qing Chang Chen ◽  
Qing Guo Chu
Keyword(s):  
Particle Size ◽  
Magnetic Properties ◽  
Magnetic Particles ◽  
Magnetic Particle ◽  
Sintering Temperature ◽  
Raw Materials ◽  
Molar Ratio ◽  
Flux Method ◽  
Sintering Time ◽  
Particle Preparation

According to the influence of sintering time, sintering temperature, different amount of flux and different molar ratio of Fe / Sr to the magnetic properties of prepared SrFe12O19 magnetic particles, the optimum SrFe12O19 conditions were concluded. They are: sintering time: 3 hours; sintering temperature: 1073.15 k; flux NaCl amount: 15% wt of the reaction raw materials; Fe / Sr molar ratio: 11.4; the sample magnetic properties: Ms = 63.39emu / g; Mr = 33.44emu / g; Hc = 5798Oe, Mr / Ms = 1 : 1.90 ≈ 1:2. The prepared SrFe12O19 should be single crystal particles and in the shape of flake, and the particle size should be generally about 80-90nm with uniform distribution.

Kinetics of low-temperature aluminothermic reduction of iron tantalate

2021 ◽  
Vol 6 ◽  
pp. 60-72
Author(s):  
R. I. Gulyaeva ◽  
◽  
A. M. Klyushnikov ◽  
S. A. Petrova ◽  
L. Yu. Udoeva ◽  
...  
Keyword(s):  
Particle Size ◽  
Low Temperature ◽  
Raw Materials ◽  
Aluminum Particle ◽  
Preexponential Factor ◽  
Molar Ratio ◽  
Scanning Calorimetry ◽  
Isothermal Exposure ◽  
Reduction Of Iron ◽  
Kinetics Of

The kinetics of low-temperature (900 – 1180 °C) reduction of iron tantalate (98.2 wt % FeTa2O6, 1.8 wt % Ta2O5, particle size < 0.1 mm) by excess aluminum (particle size < 0.14 mm) at the molar ratio Al:FeTa2O6 = 6 was studied. According to differential scanning calorimetry and X-ray powder diffraction, reduction is almost completed at 1180 °C, the metal products are TaFeAl, TaAl3, and Ta17Al12. Based on the results of thermokinetic calculations (Ozawa – Flynn – Wall and nonlinear regression methods), the formal mechanism of the process is represented by the Bna → CnC model, which includes two consecutive steps controlled by autocatalytically activated reactions. Kinetic parameters of the steps are: 1) Е1 = 429 kJ·mol–1, A1 = 1015.3 s–1; 2) Е2 = 176 kJ·mol–1, A2 = 103.9 s–1 (Ej is the activation energy, Aj is the preexponential factor). Prediction in the Bna → CnC model frames indicates the possibility of obtaining a reaction mixture containing ≥ 98 mol. % the final formal reduction product, with isothermal exposure in the temperature range of 1040 – 1120 °C during 1.5 – 5 minutes. The proposed model can be used to develop scientific foundations and substantiate technological modes for obtaining tantalum alloys from mineral and technogenic raw materials.

Microstructural characterization of laser-melted/roller-quenched dicalcium silicate

1988 ◽  
Vol 46 ◽  
pp. 582-583
Author(s):  
C. J. Chan ◽  
K. R. Venkatachari ◽  
W. M. Kriven ◽  
J. F. Young
Keyword(s):  
Particle Size ◽  
Raw Materials ◽  
Shape Change ◽  
Microstructural Characterization ◽  
Particle Size Effect ◽  
Dicalcium Silicate ◽  
Laser Melting ◽  
Uniform Size ◽  
Cell Shape Change ◽  
Wide Range

Dicalcium silicate (Ca2SiO4) is a major component of Portland cement. It has also been investigated as a potential transformation toughener alternative to zirconia. It has five polymorphs: α, α'H, α'L, β and γ. Of interest is the β-to-γ transformation on cooling at about 490°C. This transformation, accompanied by a 12% volume increase and a 4.6° unit cell shape change, is analogous to the tetragonal-to-monoclinic transformation in zirconia. Due to the processing methods used, previous studies into the particle size effect were limited by a wide range of particle size distribution. In an attempt to obtain a more uniform size, a fast quench rate involving a laser-melting/roller-quenching technique was investigated.The laser-melting/roller-quenching experiment used precompacted bars of stoichiometric γ-Ca2SiO4 powder, which were synthesized from AR grade CaCO3 and SiO2xH2O. The raw materials were mixed by conventional ceramic processing techniques, and sintered at 1450°C. The dusted γ-Ca2SiO4 powder was uniaxially pressed into 0.4 cm x 0.4 cm x 4 cm bars under 34 MPa and cold isostatically pressed under 172 MPa. The γ-Ca2SiO4 bars were melted by a 10 KW-CO2 laser.

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