11· The process control agent used It has been reported in the literature that the powder yield is around 9–10% as the Al powder welds with the walls of the ball mill as well as with the balls.
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61· The various process parameters such as milling time, ball size, ball to powder ratio, and process control agent (PCA) strongly influence the final properties of mechanically alloyed powders [5].
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91· Using a mechanical alloying process, the effect of parameters—process control agent (PCA) type and amount, and milling speed and time—on solid-solution onset and GPS of a model HEA (AlCoCrFe) is systematically investigated.
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In addition, this process includes repeated cold welding, fracturing and rewelding of powder particles in a high-energy ball mill, resulting in the formation of alloy phases. Cold welding and fracturing are the main events occurred during this process.
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51· Ruiz-Esparza-Rodríguez et al. [32] reported the effects of Al content and process control agents on the phase stability and synthesis of mechanically alloyed AlxCoCrFeMnNi. Different milling types resulted in the changes of particle size …
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201371· Process variables in mechanical milling process such as milling time, milling speed, ball-to powder weight ratio and process control agent have effects on the final structure and morphology of the powders [5].
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The processing parameters, such as milling duration, ball-to-powder mass ratio (BPR), milling media size and material, among others, are varied to control the properties of the product.
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The invention provides a preparation method of a control agent in a ball milling process, which comprises the following steps of (1) classifying standby agents according to self characteristics; (2) dissolving paste or block reagents by using the same amount of ball-milling solvent, mixing the classified reagents with ball-milled materials respectively, and testing the volume after the …
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1115· The effect of ethanol as a process control agent (PCA) on the mechanical alloying (MA) of Fe-20 at. % Al powders is presented. MA was performed at room temperature in an oscillation ball mill and its dynamic was studied by changing the milling frequency and time. We characterized the milled powders using X-ray diffraction (XRD), Möss spectroscopy, …
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325· Powder mixtures with the composition of Nb-20Ti-15Si-5Cr-3Hf-3Al (at.%) were mechanically milled in a planetary ball mill. Normal hexane (5 mass%), methyl alcohol (5 mass%) and different amount of stearic acid (0.625, 1.25, 2.5 and 5 mass%) were used respectively as the process control agent (PCA). The effects of the type and amount of PCAs on the mechanical …
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Abstract: The paper presents an overview of the current methodology and practice in modeling and control of the grinding process in industrial ball mills. Basic kinetic and energy models of …
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81· Effects of interfacial interactions between metal and process control agents during ball milling on the microstructure of the milled Fe-based nanocrystalline alloy powder
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911· In the ball milling process, some process control agents (PCAs), such as solvent, surfactant, dispersant, and coupling agent, are usually added to reduce the occurrence of cold welding and wall-sticking to stabilize broken-down particles and carry out in situ surface modification at the same time (Ref 23).
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71· The ball milling process requires the use of a Process Control Agent (PCA) to prevent excessive agglomeration and to control the milling process [17, 18]. Organic PCAs such as stearic acid and ethylene-bis-stearamide (EBS) are commonly used in research and industry, with a concentration of PCA between 2 and 3 wt% found to be effective [14, 19].
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201451· process control agents (PC As). An appropriate PCA is, however, chosen semi-empirically for any MC process such as ball-milling. In this study, …
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531· The study explores synthesis and reactivity of new reactive materials prepared by ball milling. High-energy ball milling became a ubiquitous mechano-chemical tool to …
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920· Effects of Process Control Agent Amount, Milling Time, and Annealing Heat Treatment on the Microstructure of AlCrCuFeNi High-Entropy Alloy Synthesized through Mechanical Alloying
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Effects of interfacial interactions between metal and process control agents during ball milling on the microstructure of the milled Fe-based nanocrystalline alloy powder Satoshi Motozuka, Hisashi
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2017925· A process control agent (PCA) has a significant effect on the milling process, and it influences the interface reaction and mechanical properties of the material being milled [19, 20].
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11· Abstract Despite widespread use of liquid process control agents (PCA) during material processing via high-energy ball milling, their effect on the properties of the milled powders has not been quantified or understood.
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Fe–Si–B–P–Cu nanocrystalline alloy were treated with ball-mill using a lubricant as a process control agent (PCA). The resulting alloy powder is a strong …
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201541· Abstract Nano-sized TiC ceramic powders were fabricated by very high speed planetary ball milling, especially using coarse (micron-sized) starting powders with the help of process control agents, and their refinement behavior was investigated as a function of the milling time and ball size.
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11· Despite widespread use of liquid process control agents (PCA) during material processing via high-energy ball milling, their effect on the properties of the milled powders has not been quantified or understood.
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5 · However, this technique has disadvantages such as the lack of control during the solidification process, which can lead to the formation of heterogeneous microstructures. …
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1115· The results showed that the vapor pressure, the polar nature of the different process control agents used, and type of milling (dry/wet) generating changes in the particle size distribution, microstructure, and crystalline structure since the use of PCA modifies the balance between the cold-welding and fracture processes.
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819· Fe–Si–B–P–Cu nanocrystalline alloy were treated with ball-mill using a lubricant as a process control agent (PCA). The resulting alloy powder is a strong candidate material for soft magnetic composites. Two ball milling methods (continuous and interval) were employed to control the interactions between the PCA and the alloy surface, and their effect on the …
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Powder mixtures with the composition of Nb-20Ti-15Si-5Cr-3Hf-3Al (at.%) were mechanically milled in a planetary ball mill. Normal hexane (5 mass%), methyl alcohol (5 mass%) and different amount of stearic acid (0.625, 1.25, 2.5 and 5 mass%) were used respectively as the process control agent (PCA). The effects of the type and amount of PCAs on the mechanical alloying …
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531· The study explores synthesis and reactivity of new reactive materials prepared by ball milling. High-energy ball milling became a ubiquitous mechano-chemical tool to manufacture diverse powders, from pharmaceuticals or foods to alloys to new solid rocket propellants. It enabled a dramatic expansion of the range of chemical compositions obtainable; …
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The invention provides a preparation method of ball milling process control agents. The preparation method comprises the following steps that 1, sodium stearate is added into deionized water to be stirred, then, the solution passes through a filter screen being 100 meshes to 120 meshes, and base solution is obtained; and 2, alkyl naphthalene sulfonate, alkylphenol …
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We demonstarte the effect of varying Al-Zr chemistry on the morphology, microstructure, intermetallic reactions and ignition temperature of powders prepared using arrested reactive ball milling in hexane. Upon slow heating in Ar, 3Al:Zr, Al:Zr, and Al:3Zr (at.%) produces 19 ± 2.6 kJ/mol 22.0 ± 1.6 kJ/mol, and 14.0 ± 2.6 kJ/mol of heat respectively. When rapidly heated in …
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