Effect of Molding Pressure on Densification of Al2O3/Al Cermet Materials

2017 ◽  
Vol 893 ◽  
pp. 100-104
Author(s):  
Rui Hua Wang ◽  
Xiu Qin Wang ◽  
Shuang Dong ◽  
Ning Niu ◽  
Du Juan Chang ◽  
...  
Keyword(s):  
Powder Metallurgy ◽  
High Performance ◽  
Sintering Temperature ◽  
Molding Pressure ◽  
Powder Metallurgy Method ◽  
Sample Density ◽  
Metal Materials ◽  
Engineering Materials ◽  
Cermet Materials

Cermet materials is a important new engineering materials with the advantages of ceramics and metal materials. The Al2O3/Al cermet materials is prepared via the powder metallurgy method, the effect of sintering technology on properties of Al2O3/Al cermet materials is researched in this paper, which lay the base for preparing the high performance cermet materials. The results are shown through the study, the denstity of cermet is increased with an increasing moliding pressure, the sample density is 2.084g/cm3 as the pressure for 40MPa and the sintering temperature at 600¡æ, the density is higher, that is to say it is highest performance, the distribution of aluminum and alumina is most uniform. When the sintering temperature is higher, howerver, the molding pressure is lower, the lower density of the sample is shown, the aluminum is easier to overflow the surface of the sample.

Effect of Molding Processing on Properties of Al2O3-Al Cermet Prepared via Powder Metallurgy Method

2018 ◽  
Vol 281 ◽  
pp. 303-308
Author(s):  
Rui Hua Wang ◽  
Xiao Bo Bai ◽  
Xiao Dong Jiang ◽  
Deng Liang Yi ◽  
Fang Wang ◽  
...  
Keyword(s):  
Powder Metallurgy ◽  
Sintering Temperature ◽  
Ceramic Materials ◽  
Molding Pressure ◽  
Initial Increase ◽  
Powder Metallurgy Method ◽  
Molding Process ◽  
Cermet Material ◽  
Pressure Time ◽  
Sample Density

Cermet while maintaining the excellent properties of ceramic materials, but also have the advantages of a metal material, is an important new engineering materials. In this paper, Al-Al2O3 cermet is prepared using different molding process via the powder metallurgy method to study the properties of Al-Al2O3 cermet. The conclusions are shown the density of the initial and late increase is not obvious with the cermet body forming pressure increases, but the increase in density of 20-30MPa is more obvious. The density of the cermet material increases with prolonging holding pressure time is shown, the initial increase speed is faster, and the later growth rate becomes weaker. In the different molding pressure, the pressure is 40MPa and 15min, sintering temperature is 700°C and 1h, the sample density is 2.084g/cm3, the highest density, the best performance, aluminum and alumina distribution is the most uniform.

Preparation and Characterization of Al-Al2O3 Metal Ceramics via Powder Metallurgy Methods

2016 ◽  
Vol 697 ◽  
pp. 350-353
Author(s):  
Da Ming Du ◽  
Rui Hua Wang ◽  
Jie Guang Song ◽  
Si Yuan Yu ◽  
Yao Qi Li ◽  
...  
Keyword(s):  
Electrical Resistivity ◽  
Powder Metallurgy ◽  
Relative Density ◽  
High Performance ◽  
Sintering Temperature ◽  
Al Content ◽  
Cermet Materials ◽  
Powder Metallurgy Methods ◽  
Opposite Tendency

Metal ceramics are a important new engineering materials with the advantages of ceramics and metal materials. The Al-Al2O3 metal ceramics were prepared via the powder metallurgy methods and characterized in this paper, which lay the base for preparing the high performance cermet materials. Through the results and analysis, the conclusions are shown that the relative density is increased with a increasing forming pressure, the electrical resistivity is decreased with a increasing forming pressure. The relative density is increased with a increasing sintering temperature under 700°C, the relative density decreases with a increasing sintering temperature above 700°C, the electrical resistivity is shown the opposite tendency. Through the optimizing the technological parameter, such as the sintering temperature at 700°C, the forming pressure under 20MPa, the Al content for 75wt%, Al-Al2O3 metal ceramics are successfully prepared with the high relative density and the low electrical resistivity, the relative density is 97.52%, and the electrical resistivity is 101.34Ω·m

Preparation and Characterization of Al2O3-Al Cermet with Coated Microstructure Using Powder Metallurgy Method

2018 ◽  
Vol 279 ◽  
pp. 119-123 ◽  
Author(s):  
Rui Hua Wang ◽  
Ai Xia Chen ◽  
Da Ming Du ◽  
Fang Wang ◽  
Cai Wen Li ◽  
...  
Keyword(s):  
Powder Metallurgy ◽  
Ceramic Materials ◽  
Holding Time ◽  
Molding Pressure ◽  
Initial Increase ◽  
Powder Metallurgy Method ◽  
Molding Process ◽  
Pressure Time ◽  
Sample Density ◽  
Sintering Method

Cermet includes the excellent properties of ceramic materials and the advantages of metal materials, so it is an important new engineering material. In this paper, Al2O3-Al cermet is prepared using different molding process via the powder metallurgy method to study the properties of Al2O3-Al cermet. The conclusion are shown the increasing density of Al2O3-Al cermet is not obvious with increasing the forming pressure of cermet body during the initial and late processing, but the increasing density is more obvious under the forming pressure for 20-30MPa. The density of cermet materials are increased with prolonging holding pressure time, the initial increase speed is faster, and the later growth rate becomes weaker. When the molding pressure is 30MPa, the holding time is 10min, the sintering temperature is 900°C, the holding time is 1h, the prepared Al2O3-Al cermet adding sintering aids has a coated microstructure, which indicates that the large number of particles is migrated on the grain boundary. The sample density is 2.26g/cm3, the density is highest, the distribution of Al2O3 and Al phase is the most uniform. The buried sintering method is more suitable for the preparation of Al2O3-Al cermet composites than the nudity sintering method.

Effect of Ultra High Molecular Weight Polyethylene (UHMWPE) as Binder and Sintering Temperature in Kaolin Geopolymer Ceramics on Flexural Strength

2016 ◽  
Vol 857 ◽  
pp. 412-415
Author(s):  
Romisuhani Ahmad ◽  
Mohd Mustafa Al Bakri Abdullah ◽  
Kamarudin Hussin ◽  
Andrei Victor Sandu ◽  
Mohammed Binhussain ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Powder Metallurgy ◽  
Flexural Strength ◽  
High Molecular Weight ◽  
Sintering Temperature ◽  
Powder Metallurgy Method ◽  
Liquid Ratio ◽  
Naoh Solution ◽  
Alkaline Activator ◽  
Ultra High Molecular Weight

This paper present the flexural strength of kaolin geopolymer ceramics with addition of ultra-high molecular weight polyethylene (UHMWPE) as a binder. The effect of varying UHMWPE loading and different sintering temperature on kaolin geopolymer ceramics were evaluated. Kaolin and alkaline activator were mixed with the solid-to-liquid ratio of 1.0. Alkaline activator was formed by mixing the 8 M NaOH solution with sodium silicate at a ratio of 0.24. Addition of UHMWPE to the kaolin geopolymer ceramics are fabricated with UHMWPE loadings of 2, 4, 6 and 8 (wt. %) by using powder metallurgy method. The samples were heated at different temperature started from 900 °C until 1200 °C and the strength were tested. It was found that the flexural strength for the kaolin geopolymer ceramics with addition of UHMWPE were higher and generally increased with the increasing of UHMWPE loading. Similar trend was observed for the effect of sintering temperature. The result revealed that the optimum flexural strength was obtained at UHMWPE loading of 8 wt. % and the samples heated at 1200 °C achieved the highest flexural strength (49.15 MPa).

Effect of Manufacturing Methods on Structure and Properties of the Gradient Tool Materials with the Non-Alloy Steel Matrix Reinforced with the HS6-5-2 Type High-Speed Steel

2007 ◽  
Vol 539-543 ◽  
pp. 2749-2754 ◽  
Author(s):  
A. Kloc ◽  
Leszek Adam Dobrzański ◽  
G. Matula ◽  
José M. Torralba
Keyword(s):  
Powder Metallurgy ◽  
Alloy Steel ◽  
High Speed ◽  
Sintering Temperature ◽  
High Speed Steel ◽  
Powder Metallurgy Method ◽  
Steel Matrix ◽  
Pressing Method ◽  
Isostatic Pressing ◽  
Test Pieces

Investigations carried out referred to obtaining material based on the high-speed steel and non-alloy steel. The conventional powder metallurgy method was used for manufacturing these materials, consisting in compacting the powder in the closed die and sintering it next, the isostatic pressing method, and the modern pressureless forming powder metallurgy. Forming methods were developed during the investigations for high-speed and non-alloy steel powders, making it possible to obtain materials with three layers in their structure. Investigations included determining the sintering conditions, and especially the temperature and treatment cycle, as well as examining the selected mechanical properties. It was found out, basing on the comparison of structures and properties of test pieces made with the pressureless forming method, as well as with the isostatic pressing and pressing in the closed die, with further sintering, that in structures of all examined test pieces in the sintered state fine carbides occurred distributed homogeneously in the high-speed steel layer. It was noticed, that increase of the sintering temperature, regardless of the manufacturing method, results in the uncontrolled growth and coagulation of the primary carbides and melting up to forming of eutectics in layers consisting of the high-speed steel. It was found out basing on the microhardness tests that hardness of test pieces both those pressureless formed, compacted in the closed die, and isostatically cold pressed and sintered grows along with the sintering temperature. It was also noted that the sintering temperature range is bigger in case of the pressureless formed materials.

Thermoelectric Properties of Bismuth Telluride Based Materials Prepared by Powder Metallurgy Processing

2007 ◽  
Vol 336-338 ◽  
pp. 864-867
Author(s):  
Wei Ren ◽  
Xue Quan Liu ◽  
Xiao Lin Wang ◽  
Hong Yi Jiang
Keyword(s):  
Powder Metallurgy ◽  
Mechanical Strength ◽  
Thermoelectric Properties ◽  
Bismuth Telluride ◽  
Thermoelectric Materials ◽  
High Performance ◽  
Sintering Temperature ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
P Type

Polycrystalline samples of Bi2Te3 based alloys were prepared by powder metallurgy processing including a melting-grinding and a sintering procedure of compacted pellets. Two sintering procedures as hot-pressing and spark plasma sintering (SPS) were employed. The thermoelectric properties and mechanical strength were measured in all case. Thermoelectric properties for p-type (Bi0.25Sb0.75)2Te3 and n-type Bi2(Te0.2Se0.8)3 changed with sintering temperature in both sintering methods. Mechanical strength and relative density increase with sintering temperature in two sintering procedures. The results firmly suggest that both sintering procedures are promising to obtain high performance thermoelectric materials.

scholarly journals Microstructural, Tribology and Corrosion Properties of Optimized Fe3O4-SiC Reinforced Aluminum Matrix Hybrid Nano Filler Composite Fabricated through Powder Metallurgy Method

Materials ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4090
Author(s):  
Negin Ashrafi ◽  
M. A. Azmah Hanim ◽  
Masoud Sarraf ◽  
S. Sulaiman ◽  
Tang Sai Hong
Keyword(s):  
Corrosion Resistance ◽  
Powder Metallurgy ◽  
High Performance ◽  
Aluminum Matrix ◽  
Positive Outcome ◽  
Aluminum Matrix Composite ◽  
Powder Metallurgy Method ◽  
Corrosion Properties ◽  
Weight Percentage ◽  
Hybrid Reinforcement

Hybrid reinforcement’s novel composite (Al-Fe3O4-SiC) via powder metallurgy method was successfully fabricated. In this study, the aim was to define the influence of SiC-Fe3O4 nanoparticles on microstructure, mechanical, tribology, and corrosion properties of the composite. Various researchers confirmed that aluminum matrix composite (AMC) is an excellent multifunctional lightweight material with remarkable properties. However, to improve the wear resistance in high-performance tribological application, hardening and developing corrosion resistance was needed; thus, an optimized hybrid reinforcement of particulates (SiC-Fe3O4) into an aluminum matrix was explored. Based on obtained results, the density and hardness were 2.69 g/cm3, 91 HV for Al-30Fe3O4-20SiC, after the sintering process. Coefficient of friction (COF) was decreased after adding Fe3O4 and SiC hybrid composite in tribology behaviors, and the lowest COF was 0.412 for Al-30Fe3O4-20SiC. The corrosion protection efficiency increased from 88.07%, 90.91%, and 99.83% for Al-30Fe3O4, Al-15Fe3O4-30SiC, and Al-30Fe3O4-20SiC samples, respectively. Hence, the addition of this reinforcement (Al-Fe3O4-SiC) to the composite shows a positive outcome toward corrosion resistance (lower corrosion rate), in order to increase the durability and life span of material during operation. The accomplished results indicated that, by increasing the weight percentage of SiC-Fe3O4, it had improved the mechanical properties, tribology, and corrosion resistance in aluminum matrix. After comparing all samples, we then selected Al-30Fe3O4-20SiC as an optimized composite.

scholarly journals Preparation and Characterization of Tungsten Carbide WC/Cobalt Composites by Powder Metallurgy Method

2019 ◽  
Vol 9 (2) ◽  
pp. 2165-2168
Keyword(s):  
Powder Metallurgy ◽  
Tungsten Carbide ◽  
Sintering Temperature ◽  
High Hardness ◽  
Cobalt Content ◽  
Good Choice ◽  
Powder Metallurgy Method ◽  
X Ray Diffraction ◽  
Analytical Technique

The Tungsten carbide (WC) based composites are good choice to replace the traditional conventional materials for obtaining high hardness and wear resistance. This work investigates the influence of cobalt content on the characterization of Tungsten carbide. The composite specimens are prepared by using powder metallurgy technique. The effect of cobalt material on the performance of Tungsten carbide hardness, fracture toughness is estimated by conducting suitable experiments. While performing experiments, a powder mixture of 89% WC, 11% of Co was manufactured with powder metallurgy, under appropriate milling conditions and Sintering temperature to ensure uniform microstructure. From the present work the optimum sintering temperature of Tungsten carbide mixed nano cobalt composite is identified. The crystalanity of the resulting materials is identified from a rapid analytical technique, X -ray Diffraction.

Fabrication of W-12wt%Cu Composites by Powder Metallurgy Method: Activated Sintering

2011 ◽  
Vol 409 ◽  
pp. 209-214
Author(s):  
Javad Samei ◽  
Daniel E. Green ◽  
Vesselin Stoilov
Keyword(s):  
Powder Metallurgy ◽  
Solid State ◽  
Liquid Phase ◽  
Hot Pressing ◽  
Sintering Temperature ◽  
Powder Metallurgy Method ◽  
High Quality ◽  
Activated Sintering ◽  
Sintering Time ◽  
Processing Techniques

One of the most challenging areas in engineering of composite materials is the fabrication of high quality microstructures. This issue is complicated for tungsten composites due to its high melting temperature and this leads to limitations in terms of possible processing techniques. This research investigates the fabrication of W-12%wtCu composites based on powder metallurgy techniques. Due to the very large difference between the melting point of tungsten and copper, there is no common sintering temperature range for them. In this work, 0.5%Wt nickel was added as an activator to decrease the sintering temperature of tungsten using an activated sintering effect. The effects of pressure, sintering time and temperature in solid state and liquid phase conditions were also investigated. While solid state hot pressing did not result in appropriate microstructures, the liquid phase hot pressing provided high quality samples with a relative density of 98.0%.

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