• Title/Summary/Keyword: properties of the powder

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A Study on Pore Properties of SUS316L Powder Porous Metal Fabricated by Electrostatic Powder Coating Process (정전분체코팅 공정으로 제조된 SUS316L 분말 다공체의 기공 특성에 관한 연구)

  • Lee, Min-Jeong;Yi, Yu-Jeong;Kim, Hyeon-Ju;Park, Manho;Kim, Byoung-Kee;Yun, Jung-Yeul
    • Journal of Powder Materials
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    • v.25 no.5
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    • pp.415-419
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    • 2018
  • Porous metals demonstrate not only excessively low densities, but also novel physical, thermal, mechanical, electrical, and acoustic properties. Thus, porous metals exhibit exceptional performance, which are useful for diesel particulate filters, heat exchangers, and noise absorbers. In this study, SUS316L foam with 90% porosity and $3,000{\mu}m$ pore size is successfully manufactured using the electrostatic powder coating (ESPC) process. The mean size of SUS316L powders is approximately $12.33{\mu}m$. The pore properties are evaluated using SEM and Archimedes. As the quantity of powder coating increases, pore size decreases from 2,881 to $1,356{\mu}m$. Moreover, the strut thickness and apparent density increase from 423.7 to $898.3{\mu}m$ and from 0.278 to $0.840g/cm^3$, respectively. It demonstrates that pore properties of SUS316L powder porous metal are controllable by template type and quantity of powder coating.

A Study on Hydration Properties of Recycled Cement Mortar using Admixture Materials (혼화재료를 혼입한 재생시멘트 모르터의 수화특성에 관한 연구)

  • Park, Cha-Won;Kang, Byeung-Hee
    • Journal of the Korea Institute of Building Construction
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    • v.4 no.4
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    • pp.79-86
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    • 2004
  • The purpose of this study was the development of a recycling process to recover the hydraulic properties of hydration products which account for a large proportion of cementitious powder from concrete waste. This process was performed to recycle cementitious powder as recycle cement. Therefore, after the theoretical consideration of the properties of recycle process of recycled aggregates and cementitious powder, we investigated the hydraulic properties of cementitious powder under various temperature conditions in hardened mortar which was modeled on concrete waste. And we analyzed properties of chemical reactions of recycled cement with admixture materials such as Fly-Ash, Blast Furnace Slag As a result of the experiment, the most effective method to recover hydraulic properties of the cementitious powder from concrete waste was condition of burning at 700℃ for 120 minute. And it is shown that the fluidity of mortar was decreased rapidly when the burning temperature of recycle cement was increased. However, the compressive strength and fluidity were improved significantly when admixture materials such as Fly-Ash or Blast Furnace Slag was added.

Effect of Relative Density on the Tensile Properties of Powder Injection Molded PH 17-4 Stainless Steel (분말사출성형된 17-4 PH STS 소결체의 밀도에 따른 인장 특성)

  • 성환진;하태권;안상호;장영원
    • Journal of Powder Materials
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    • v.9 no.4
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    • pp.211-217
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    • 2002
  • It is well known that the powder injection molding(PIM) process can overcome the shape limitations of traditional powder compaction, the costs of machining, the productivity limits of isostatic pressing and slip casting, and the defect and tolerance limitations of conventional casting. Increasing demands from industry for not only the dimensional accuracy nut mechanical strength in PIMed parts have had much effort focused on the investigation of mechanical properties of mechanical strength in PIMed parts have had much effort focused on the investigation of mechanical properties of sintered parts formed with high-strength metallic powders. The 17_4 PH $10\mu{m}$ were injection-molded into flat tensile specimens. Sintering of the compacts was carried out at the various temperatures ranging from 900 to $1350^{\circ}C$. Sintering behavior of the compacts and tensile properties of sintered specimens were investigated.

Quality Properties of Rice Cake Containing Bamboo Sprout Powder (죽순분말을 첨가한 절편(떡)의 특성)

  • Moon, Eun Woo;Park, Hun Jo;Na, Hwan Sik;Park, Jung Suk
    • Journal of the Korean Society of Food Culture
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    • v.30 no.5
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    • pp.650-655
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    • 2015
  • Bamboo sprout powder was added to rice cake in an effort to improve the quality and functional properties of dough. The contents of crude protein and carbohydrates increased as the amount of bamboo sprout powder increased, whereas moisture contents decreased. According to increasing contents of bamboo sprout powder, total amino acid contents significantly increased. Hunter's L value decreased as contents of bamboo sprout powder increased, whereas sucrose contents increased. Addition of bamboo sprout powder to rice cake increased dietary fiber contents. Sensory scores of rice cake containing 90 g of bamboo sprout powder were the highest of all rice cakes tested. According to the results, adding bamboo sprout powder could improve the quality and sensory characteristics of rice cake.

Improvements in the Physical Properties of Agglomerated Milk Protein Isolate/Skim Milk Powder Mixtures Via Fluidized Bed Agglomeration

  • Seo, Chan Won
    • Journal of Dairy Science and Biotechnology
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    • v.40 no.3
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    • pp.134-142
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    • 2022
  • Protein-enriched dairy powder is widely consumed to promote muscle synthesis. Recently, in Korea, elderly people have also begun consuming protein powder products to prevent muscle loss. However, these protein-enriched powders have poor flowability and hydration properties because of the fine particles of spray-dried milk protein powder. Therefore, in this study, the fluidized bed agglomeration process was used to solve these problems. The rheological and physical properties of milk protein isolate (MPI)/skim milk powder (SMP) mixtures were effectively improved via fluidized bed agglomeration. The particle size of the MPI/SMP mixtures significantly increased from 35.7-58 ㎛ to 118-136 ㎛, the flowability level improved from fair (21.4-26.3) to good (15.7-16.3), and the cohesiveness level changed from intermediate (1.27-1.36) to low (1.18-1.19) after fluidized bed agglomeration. In addition, the wetting time of the agglomerated MPI/SMP mixtures was effectively reduced to 4.67-58.3 s by fluidized bed agglomeration. These findings may be useful for manufacturing protein-enriched dairy powders with good instant properties.

Trend of Powder Technology for Ceramics (세라믹스 원료 분체기술의 동향)

  • Fukui, Takehisa
    • Ceramist
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    • v.9 no.6
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    • pp.42-48
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    • 2006
  • The structural ceramic, such as $A1_2O_3,\;ZrO_2\;and\;Si_3N_4$ have applied as several parts of precision machines, automotives and instruments for semiconductor. The mechanical properties depended on purity, morphology and microstructure of the ceramic and its fabrication process. High purity and fine starting powder for the structural ceramic was prepared mainly by wet process and powder processing such as milling, mixing, drying and granulating strongly influenced on the fabrication process. Powder processing included powder synthesis technology is essential for ceramic manufacture. Also, the advanced mechanical treat[neat in powder processing to create nano composite powder was developed to improve several properties of ceramic materials. Innovation of powder processing will lead to improve mechanical and functional properties of the ceramics.

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Tribological Properties of Raction-Bonded SiC-Graphite Composites (반응소결 SiC-graphite 복합체의 마찰마모특성)

  • 백용혁;신종윤;곽효섭;박용갑
    • Journal of the Korean Ceramic Society
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    • v.33 no.5
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    • pp.479-484
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    • 1996
  • The tribological properties of ceramics are very important in the application to engineering ceramic parts such as mechanical seal slurry valve disc and so on. In this study the effect of graphite addition on the mechanical and tribological properties of RBSC/graphite composites were investigated. The composites were prepared by adding graphite powder to the mixture of SiC powder metallic siliconcarbon black and alumina. Bending strength water absorption friction coefficient the amount of worn out material at a certain time and maximum surface roughness(Rmax) of the prepared composites were measured and crystalline phases were examined with XRD. The composite containing 5 vol% graphite powder showed improved bending strength due to high green density and decreased friction coefficient and wear resistance. The friction coefficient and the wear resistance of the composite were increased by adding graphite powder up to 10 vol% They decreased however as increasing the amount of graphite powder more that 10vol% There was no linear relationship between the tribological properties and bending strength of the composites.

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The Properties of Recycle Cement to Reuse Cementitious Powder from Neutralized Concrete Waste (중성화가 진행된 폐콘크리트계 미분말을 재활용한 재생시멘트의 물성)

  • Kang, Tae-Hun;Kim, Sung-Su;Jung, Min-Soo;Kang, Byung-He
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2003.11a
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    • pp.77-82
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    • 2003
  • The purpose of this study is development of technique to use cementitious powder as recycle cement produced from deteriorated Concrete waste which has a large quantity of calcium carbonate. Therefore, after having theoretical consideration based on the properties of high-heated concrete and concerning about neutralization of Concrete, we analysis chemical properties of ingredients of cementitious powder. After making origin cement paste, then processing the accelarated carbonation, we consider the properties of hydration and chemical properties of cementitious powder under various temperature conditions. As a result of the thermal analysis, the CaCo3 content of cementitious powder would affect decision of heat temperature to recover its hydrated ability because CaCo3 content is increased when neutralization is progressed. And as a result of XRD analysis, in case of origin powder of non-neutralized paste, CaO peak is found at 700℃. but, heat temperature to generate CaO would increase when the content of neutralized ingredients is increased. Finally, recycle cement heated at 700℃ shows the best compressive strength when the content of neutralized ingredients in recycle cement is less then 50%. However, it would be quite difficult to manage quality of recycle cement according to recycling points of various concrete waste.

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The Properties of Recycle Cement to Reuse Cementitious Powder from Neutralized Concrete Waste (중성화가 진행된 폐콘크리트계 미분말을 재활용한 재생시멘트의 물성)

  • 강태훈;김성수;정민수;강병희
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2003.05a
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    • pp.77-82
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    • 2003
  • The purpose of this study is development of technique to use cementitious powder as recycle cement produced from deteriorated Concrete waste which has a large quantity of calcium carbonate. Therefore, after having theoretical consideration based on the properties of hish-heated concrete and concerning about neutralization of Concrete, we analysis chemical properties of ingredients of cementitious powder After making origin cement paste, then processing the accelerated carbonation, we consider the properties of hydration and chemical properties of cementitious powder under various temperature conditions As a result of the thermal analysis, the CacO3 content of cementitious powder would affect decision of heat temperature to recover its hydrated ability because CacO3 content is increased when neutraliTation is preBlessed. And as a result of XRD analysis. in case of origin powder of non-neutralized paste, CaO peak is found at $700^{\circ}C$. but, heat temperature to generate CaO would increase when the content of neutralized ingredients is increased. Finally, recycle cement heated at $700^{\circ}C$ shows the best compressive strength when the content of neutralized ingredients in recycle cement is less then 50%. However, it would be quite difficult to manage quality of recycle cement according to recycling points of various concrete waste.

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Fabrication and Magnetic Properties of Nanostructured Fe-Co Alloy Powder (나노 구조 Fe-Co 합금분말의 제조 및 자성특성)

  • 이백희;안봉수;김대건;김영도
    • Journal of Powder Materials
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    • v.9 no.3
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    • pp.182-188
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    • 2002
  • Conventional Fe-Co alloys are important soft magnetic materials that have been widely used in industry. Compared to its polycrystalline counterpart, the nanostructured materials have showed superior magnetic properties, such as higher permeability and lower coercivity due to the single domain configuration. However, magnetic properties of nanostructured materials are affected in complicated manner by their microstructure such as grain size, internal strain and crystal structure. Thus, studies on synthesis of nanostructured materials with controlled microstructure are necessary for a significant improvement in magnetic properties. In the present work, starting with two powder mixtures of Fe and Co produced by mechanical alloying (MA) and hydrogen reduction process (HRP), differences in the preparation process and in the resulting microstructural characteristics will be described for the nano-sized Fe-Co alloy particles. Moreover, we discuss the effect of the microstructure such as crystal structure and grain size of Fe-Co alloys on the magnetic properties.