Synthesis of Materials from Powders by Sintering

Stuijts, A. L.

doi:10.1146/annurev.ms.03.080173.002051

Cited by 12 publications

(9 citation statements)

References 66 publications

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“…For these parameters of sintering, the coefficient of friction assumed the values of 0.50, 0.45, 0.43 and 0.37 for composites containing 2 vol%, 4 vol%, 6 vol% and 8 vol% of TiB 2 , respectively. By contrast, the specific wear rate was 429*10 -6 [mm 3 /Nm], 341*10 -6 [mm 3 /Nm], 314*10 -6 [mm 3 /Nm] and 299*10 -6 [mm 3 /Nm] for composites containing 2 vol%, 4 vol%, 6 vol% and 8 vol% of TiB 2 , respectively. The results of tribological studies made on the composites fabricated by two different methods of sintering were consistent with the achievements of, among others, Tjong et al [48,57].…”

Section: Resultsmentioning

confidence: 99%

“…Density was determined by weighing in air and water using Archimedes method. Uncertainty of measurements was 0.02 g/cm 3 . Young's modulus of the composites were measured basing on the velocity of the ultrasonic waves transition through the sample using ultrasonic flaw detector Panametrics Epoch III.…”

Section: Testing Methodsmentioning

confidence: 99%

“…Besides, parsimony in the use of materials, energy, time and automation of the process make the method very economical and prospective. Therefore, in recent years, the interest in modern sintering methods in the production processes has increased [1][2][3][4].…”

Section: IVmentioning

confidence: 99%

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Consolidation of AISI316L Austenitic Steel — TiB2 Composites by SPS and HP-HT Technology

Sulima¹

2015

Sintering Techniques of Materials

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Section: Resultsmentioning

confidence: 99%

Section: Testing Methodsmentioning

confidence: 99%

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Consolidation of AISI316L Austenitic Steel — TiB2 Composites by SPS and HP-HT Technology

Sulima¹

2015

Sintering Techniques of Materials

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“…The values of tl and t2 in the case of the LiF-doped aluminum magnesium spinel are affected not only by the nature of the liquid phase but also by the extent of its accumulation along the grain boundaries [7]. Figure 2 shows the dependence of log p on B for the AMS I and AMS I-5 at 1300~ and a rate of movement of 0.02 mm/min of the traverse of the Instron machine.…”

Section: O=~(p) T=const Dt/d-c =Const (Regime No 3)mentioning

confidence: 99%

Compaction and recrystallization kinetics of aluminum magnesium spinel doped with lithium fluoride

Udalova¹,

Kurova²,

Kashkai³

et al. 1981

Refractories

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It is well known that the addition of LiF helps to compact oxides by acting as a liquid phase which reacts with the solid substance [i, 2] or as a mineralizing additive which accelerates the synthesis of aluminum magnesium spinel [3].The present article reports some results from a study of the effect of LiF on the degree and the rate of the compaction and recrystallization of aluminum magnesium spinel grains at temperatures of 20-1400~and pressures of 40-120 MPa.The aluminum magnesium spinel was obtained by recrystallizing magnesium and aluminum sulfates followed by solid phase synthesis at 1300~We used aluminum magnesium spinels with a concentration of 97.8%* (AMS I) or 99.1% (AMS II) of the main material. These spinels were doped with 0.15-0.75% LiF using two chemical methods.The AMS powder was previously impregnated with a LiF solution (method i) or with solutions of LiOH plus HF (method 2).The LiF solution was prepared by mixing solutions of a 9% HF and 7% LiOH until the pH was 5.8.The suspensions of the doped spinel were evaporated at 200~ and the powders calcined at 700~ for 2 h. All the AMS specimens were doped with LiF using the first method except for the AMS I-4 specimens which were doped by the second method.The compaction kinetics of the aluminum magnesium spinel were determined using a dynamic method [2] in accordance with three regimes where the density of the briquette was a function of the following pressing parameters: O=~(P) t=const, dt/d-c =const (regime No. 3),where t is the temperature, ~ ~, time, min; dt/dT, heating rate of 10~ p, pressure, equal to 40 MPa for regime 1 and I00 MPa for regime 2; dl/dT, rate of movement of the traverse of the Instron machine, where d~/dT is 0.02 mm/min.The density of the briquette after pressing was determined by hydrostatic weighing in toluene to an accuracy of _+0.001 g/cm 3. A value of 3.578 g/cm 3 was taken as the theoretical density of the 32iS [4].The concentration of Li in the doped powders was determined using flame photometry in an SP-900 spectrophotometer, and the concentration of F by a photocolorimetric method based on the decolorization of a comnound of zirconium and eriochromcyanine.The microstructure of the hot-pressed specimens was studied using an ~M-6 electron microscope using the carbon replica method from fresh chips in a plane parallel to the direction of the pressing force and passing through the center of the specimen.The grain size was determined using a "secant" method [5]. Tables 1-3 show the results of chemical analyses of the powders of the untreated spinels and of the powders after doping with LiF.The tables also give the compaction parameters when the pressing parameters are varied.With an increase in the pressing temperature from 20 to 700~ the density of the specimens of the experimental powders changes within 0.40-0.50, remaining equal to the density *Here and elsewhere mass fractions are given.

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“…The use of powder metallurgy for the manufacture of metal matrix composites allows obtaining a diffusive bond between the matrix and the reinforcing phase. It also creates a vast range of possibilities as regards the choice of the type, form and size of the reinforcing phase and enables making products which, while having the same chemical composition, are characterized by different densities [1][2][3]. Many technologies including free sintering [4,5], self-propagating high-temperature synthesis (SHS) [6,7], Hot Isostatic Pressing (HIP) [8,9] and Spark Plasma Sintering (SPS/FAST) [10] have been used to make steel matrix composites.…”

Section: Introductionmentioning

confidence: 99%

Influence of ZrB2 on Microstructure and Properties of Steel Matrix Composites Prepared by Spark Plasma Sintering

et al. 2020

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In this study, four composites with different ZrB2 content were made by the Spark Plasma Sintering (SPS/FAST) technique. The sintering process was carried out at 1373 K for 5 min under an argon atmosphere. The effect of ZrB2 reinforcing phase content on the density, microstructure, and mechanical and tribological properties of composites was investigated. The results were compared with experimental data obtained for 316L austenitic stainless steel without the reinforcing phase. The results showed that the ZrB2 content significantly affected the tested properties. With the increasing content of the ZrB2 reinforcing phase, there was an increase in the Young’s modulus and hardness and an improvement in the abrasive wear resistance of sintered composites. In all composites, new fine precipitates were formed and distributed in the steel matrix and along the grain boundaries. Microstructural analysis (Scanning Electron Microscopy (SEM), Wavelength Dispersive Spectroscopy (WDS)) has revealed that the fine precipitates chromium contained chromium as well as boron.

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Synthesis of Materials from Powders by Sintering

Cited by 12 publications

References 66 publications

Consolidation of AISI316L Austenitic Steel — TiB2 Composites by SPS and HP-HT Technology

Consolidation of AISI316L Austenitic Steel — TiB2 Composites by SPS and HP-HT Technology

Compaction and recrystallization kinetics of aluminum magnesium spinel doped with lithium fluoride

Influence of ZrB2 on Microstructure and Properties of Steel Matrix Composites Prepared by Spark Plasma Sintering

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