Effect of Sintering Aids Sorts on Properties of Prepared Al2O3-Al Cermet

2018 ◽  
Vol 281 ◽  
pp. 297-302 ◽  
Author(s):  
Rui Hua Wang ◽  
Xiao Bo Bai ◽  
Xiao Dong Jiang ◽  
Deng Liang Yi ◽  
Fang Wang ◽  
...  
Keyword(s):  
Powder Metallurgy ◽  
Bonding Strength ◽  
Sintered Density ◽  
Surface Hardness ◽  
Ceramic Materials ◽  
Alumina Powder ◽  
Powder Metallurgy Method ◽  
Sintering Aids ◽  
Metal Ceramic ◽  
Better Than

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 adding different sintering aids via the powder metallurgy method to study the properties of Al-Al2O3 cermet. The conclusions are shown the adding sintering aids can significantly improve the sintered density of Al-Al2O3 cermet. The sintering aiding effect of adding MgO is better than that of SiO2 and Y2O3, and the hardness and the strength of the sample are higher than those of samples with SiO2 and Y2O3, and the densification degree of Al-Al2O3 metal ceramic material is the best, the relative density is 94.8%, the surface hardness is 824HV. The flatness of the surface of the sample adding MgO shows that the bonding strength between aluminum powder and alumina powder is high. The prepared Al-Al2O3 cermet adding different sintering aids have higher density and fewer pores in the microstructure the prepared Al-Al2O3 cermet adding sintering aids has a package structure.

Synthesis and Characterisation of Anodized Powder Metallurgy Mg-Ca Alloy

2018 ◽  
Vol 280 ◽  
pp. 221-225
Author(s):  
C.D. Zuraidawani ◽  
F.W. Norhadira ◽  
Mochd Nazree B. Derman
Keyword(s):  
Powder Metallurgy ◽  
Oxide Film ◽  
Vickers Hardness ◽  
Film Formation ◽  
Surface Hardness ◽  
Powder Metallurgy Method ◽  
Xrd Pattern ◽  
Surface Changes

The Mg-1wt.%Ca alloy was fabricated using powder metallurgy method. The anodizing process were done by using different voltage (5V, 15V, 25V) and concentration of KOH (0.1M, 0.5M, 1.0M). The surface changes on PM Mg/1wt.%Ca resulted by anodizing was analyzed using SEM-EDX and XRD pattern. Meanwhile, surface hardness was measured by micro-Vickers hardness machine. The experiment found different XRD pattern between all non-anodized and anodized samples. The study found that increasing the voltage will increase the hardness while increasing KOH concentration reduced the hardness. The relation of the hardness and oxide film formation can be analyzed using SEM-EDX and XRD pattern. The optimum value for voltage, KOH concentration and hardness are 25V, 0.1M and 27.2 HV. The XRD detect the changes in PM Mg/1wt.% Ca indicates the oxide film formation.

A Novel Ceramic Thermocouple Used in High-Temperature Measurement

2011 ◽  
Vol 197-198 ◽  
pp. 328-332
Author(s):  
Li Chao Feng ◽  
Ning Xie ◽  
Wen Zhu Shao ◽  
Yu Sheng Cui ◽  
Liang Zhen
Keyword(s):  
High Temperature ◽  
Powder Metallurgy ◽  
Temperature Measurement ◽  
Powder Metallurgy Method ◽  
Simple Relationship ◽  
Response Characteristics ◽  
Sic Ceramics ◽  
High Temperature Measurement ◽  
Holding Temperature ◽  
Better Than

MoSi2and SiC ceramics were prepared by traditional powder metallurgy method. A novel ceramic thermocouple (CTC) used in the high temperature and high corrosion environment was assembled by SiC as the cathode and MoSi2as the anode. The thermo-emf of CTC was tested from 25 °C to 1600 °C in air. The results show that there is a simple relationship between the thermo-emf of CTC and the temperature. By holding temperature for 70 h at 1500 °C, the deviation of thermo-emf is ±0.37%, and better than 0.75% which is the criteria of industry thermocouple. And also the response characteristics of CTC were analyzed.

Effect of Fabrication Method by Powder Metallurgy on Frangibility Green Bullet Cu-10%Sn as Eco-Friendly Bullet

2015 ◽  
Vol 1112 ◽  
pp. 533-537
Author(s):  
Khoiril Metrima Firmansyah ◽  
Albertus Septyantoko ◽  
Mochammad Ghulam Isaq Khan ◽  
Paiman Jhony ◽  
Rosena Mardliah ◽  
...  
Keyword(s):  
Powder Metallurgy ◽  
Base Material ◽  
Holding Time ◽  
Powder Metallurgy Method ◽  
Xrd Pattern ◽  
Powder Metallurgy Process ◽  
Dry Mixing ◽  
Metallurgy Process ◽  
New Phase ◽  
Better Than

The bullet is used for immobilize object. However it can harm the shooter because it can be ricochet. Thus it, we develop frangible bullet which can be broken when hit the hard target. Conventional bullets are made of lead base material which poison. Therefore frangible bullet does not use lead as base material, so it is classified as green bullet. Green bullet is made by powder metallurgy method. Powder metallurgy process are measuring copper and tin powder, dry mixing, and compacting 600 Mpa in pressure for 10 minutes in holding time, and sintering at 300, 500, 700°C for 0,5; 1; and 1,5 hours in holding time. Then, measure the sinter density and analyze the sample by XRD and SEM-EDX. Based on experiment, we found that the bullet Cu-10%wt which sintering 500 °C in temperature for 1 hour has the best frangibility. The highest theoretical density , compression strength, and hardness are 8.8 gr/cm3, 280.45 MPa, 60.67 HRF. The observer result by scanning electron microscope showed that the phase homogeneity at sintering temperature 500°C for 1 hour in holding times was better than the other variable. By observing phase formed, in XRD pattern show that identified new phase Cu10Sn3caused the material properties fragile.

Technical Features Evaluation of an Alumina Powder Prepared by Combustion Synthesis

2006 ◽  
Vol 514-516 ◽  
pp. 1546-1550
Author(s):  
A. Patrícia Tavares ◽  
Susana M.H. Olhero ◽  
José Maria F. Ferreira
Keyword(s):  
Flexural Strength ◽  
Combustion Synthesis ◽  
Vickers Hardness ◽  
Sintered Density ◽  
Sem Analysis ◽  
Alumina Powder ◽  
Processing Conditions ◽  
Sintering Aids ◽  
Rheological Measurements ◽  
Technical Features

This work aims at characterising an alumina powder obtained by combustion synthesis, and at evaluating the technical properties of sintered bodies. Particle size distribution and XRD were used to characterise the alumina powder; electrophoresis and rheological measurements were used to select the most suitable processing conditions. Sintered density, flexural strength, Vickers hardness and SEM analysis were used to characterise the bodies sintered at 1600°C. The experimental results showed that a density of 3.60 g/cm3 could be obtained in absence of sintering aids and that the sintered bodies exhibited a flexural strength of 220 MPa and a Vickers hardness of 1100.

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.

scholarly journals Development of Novel Lightweight Metastable Metal–(Metal + Ceramic) Composites Using a New Powder Metallurgy Approach

Materials ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3283 ◽  
Author(s):  
Khin Sandar Tun ◽  
Akshay Padnuru Sripathy ◽  
Sravya Tekumalla ◽  
Manoj Gupta
Keyword(s):  
Powder Metallurgy ◽  
Synthesis Method ◽  
Ceramic Composites ◽  
Advanced Materials ◽  
Synthesis Process ◽  
Powder Metallurgy Method ◽  
Scanning Calorimetry ◽  
Intermetallic Formation ◽  
Metal Metal ◽  
Metal Ceramic

In the current study, metal–(metal + ceramic) composites composed of biocompatible elements, magnesium (Mg), zinc (Zn), calcium (Ca) and manganese (Mn) were synthesized using a sinter-less powder metallurgy method. The composite has a composition of Mg49Zn49Ca1Mn1 (wt.%) in which the compositional ratio between Mg and Zn was chosen to be near eutectic Mg-Zn composition. The synthesis method was designed to avoid/minimize intermetallic formation by using processing temperatures lower than the Mg-Zn binary eutectic temperature (~ 340 °C). The synthesis process involved extrusion of green compacts at two different temperatures, 150 °C and 200 °C, without sintering. Extrusion was performed directly on the green compacts as well as on the compacts soaked at temperatures of 150 °C and 200 °C, respectively. Microstructure and mechanical properties of the materials synthesized under various processing conditions were investigated. Effect of extrusion temperature as well as soaking temperature on the materials’ properties were also evaluated in details and different properties showed an optimum under different conditions. All the synthesized materials showed no evidence of intermetallic formation which was confirmed by SEM/EDS, XRD, and Differential Scanning Calorimetry (DSC) techniques. The study establishes development of unconventional metal–(metal + ceramic) eco-friendly composites and provides important insight into realizing certain properties without using sintering step thus to minimize the energy consumption of the process. The study also highlights the use of magnesium turnings (recyclability) to develop advanced materials.

Densification Mechanism of Al2O3/Al Metallic Ceramics Prepared via Powder Metallurgy Method

2017 ◽  
Vol 726 ◽  
pp. 189-193
Author(s):  
Rui Hua Wang ◽  
Yao Qi Li ◽  
Si Yuan Yu ◽  
Xiu Qin Wang ◽  
Jie Guang Song ◽  
...  
Keyword(s):  
Raw Materials ◽  
Performance Testing ◽  
High Strength ◽  
Ceramic Materials ◽  
Raw Material ◽  
Alumina Powder ◽  
Powder Metallurgy Method ◽  
High Plasticity ◽  
Pressure Time ◽  
Process Pressure

Alumina ceramics with good mechanical and corrosion resistance, is one of the most widely used engineering ceramics. The aluminum has a high strength, high conductivity, high plasticity, etc. than aluminum ceramics used in more and more industries. In this paper, aluminum and alumina powder as raw material, mixing, forming, sintering and a series of processes for preparing the alumina/aluminum metallic ceramic materials, through performance testing and analysis can be found in the ratio of raw materials 50wt% Al, 50wt % Al2O3 relatively good moldability. After sintering, after measuring the density contrast is found better density in the pressing process pressure of 20MPa and holding pressure time for 20min. By comparing the sintering process, after the interface structure by scanning electron microscopy and found help improve density through the secondary sintering metallic ceramic materials.

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.

scholarly journals Structural and Electrical Properties of Copper-Nickel-Aluminum Alloys Obtained by Conventional Powder Metallurgy Method

2010 ◽  
Vol 660-661 ◽  
pp. 41-45 ◽  
Author(s):  
Waldemar Alfredo Monteiro ◽  
Juan Alfredo Guevara Carrió ◽  
C.R. Da Silveira ◽  
E. Vitor ◽  
S.J. Buso
Keyword(s):  
Powder Metallurgy ◽  
Aluminum Alloys ◽  
High Performance ◽  
Sintered Density ◽  
Microstructural Analysis ◽  
Powder Metallurgy Method ◽  
X Rays ◽  
Nickel Aluminum ◽  
Copper Nickel ◽  
Structural And Electrical Properties

This work looked for to search out systematically, in scale of laboratory, copper-nickel-aluminum alloys (Cu-Ni-Al) with conventional powder metallurgy processing, in view of the maintenance of the electric and mechanical properties with the intention of getting electric connectors of high performance or high mechanical damping. After cold uniaxial pressing (1000 kPa), sintering (780oC) and suitable homogenization treatments (500oC for different times) under vacuum (powder metallurgy), the obtained Cu-Ni-Al alloys were characterized by optical microscopy, electrical conductivity, Vickers hardness. X rays powder diffraction data were collected for the sintered samples in order to a structural and microstructural analysis. The comparative analysis is based on the sintered density, hardness, macrostructures and microstructures of the samples.

Sign in / Sign up

Export Citation Format

Share Document