• Title, Summary, Keyword: 소결

Search Result 3,673, Processing Time 0.035 seconds

Grain boundary structure and electrical characteristics of alkaline metallic cation-diffused $(SrCa)TiO_3$ ceramics (알칼리 금속 이온의 입계확산에 따른 $(SrCa)TiO_3$ 소결체의 입계구조 및 전기적 특성)

  • Heo, Hyeon;Cho, Nam-Hui
    • Journal of the Korea Institute of Military Science and Technology
    • /
    • v.2 no.1
    • /
    • pp.183-193
    • /
    • 1999
  • Semiconducting (Sr0.85Ca0.15)TiO3 ceramics were prepared by conventional powder synthesis techniques, and then alkaline metallic cations were diffused into the ceramic bodies. The threshold voltage of the ceramics increases with increasing diffusion time and the amount of diffused materials. The ceramics had boundary potential heights of 0.01 ~ 2.89 eV, while their boundary resistance ranged from 2.2 $M{\Omega}$ to 120.4 $M{\Omega}$. Such electrical characteristics of the boundaries were correlated with the boundary structure of the ceramics obtained by transmission electron microscopy.

  • PDF

Properties of Sr-Ferrites Prepared by Spark Plasma Sintering Process (스파크 플라즈마 소결법으로 제조된 Sr-페라이트의 특성)

  • Roh, J.S.;Oh, M.H.
    • Journal of the Korean Magnetics Society
    • /
    • v.13 no.1
    • /
    • pp.29-35
    • /
    • 2003
  • Anisotropic Sr-ferrites were prepared by the spark plasma sintering process (SPS). The Ferrite particles were oriented and densified during sintering process, and the anisotropic ferrites were manufactured at low sintering temperature and a remarkable short time processing by SPS method. It was showed that the anisotropy of ferrite particles at the specimen outer side was more higher than that at the specimen center, and it seems possible that the orientation of ferrite particles was related to DC current. Magnetic and physical properties of sintered Sr-ferrites are Br = 3.15 kG, iHc : 2.67 kOe, and density : 5.033 g/cm$^3$ when the samples were sintered for 8 minutes at 106$0^{\circ}C$.

Effects of Sintering Atmosphere on the Isothermal Phase Transformation in Yttria-stabilized Zirconia Ceramics (소결분위기가 이트리아 안정화 지르코니아 세라믹스의 미세구조 및 등온상전이에 미치는 효과)

  • Lee, J.K.;Kang, H.H.;Hwang, Y.;Kwak, H.S.;Lee, W.S.
    • Korean Journal of Materials Research
    • /
    • v.7 no.5
    • /
    • pp.411-416
    • /
    • 1997
  • 수소 및 산소분위기 하에서 2Y-TZP 및 3Y-PZP 세라믹스를 소결하여 각각 제조한 다음, 각 시편의 미세구조 및 25$0^{\circ}C$에서의 등온상전이 거동을 비교하여 고찰하였다. 그 결과 수소분위기에서 소결한 모든 시편의 표면에서는 Zr$_{4+}$ 이온의 환원에 의해 산화분위기에서 소결한 시편에 비하여 색이 검게 변하였으며, 장시간 소결시 시편 표면에 조대 입자의 생성 및 입계 이완이 관찰되었다. 이에따라 수소분위기 하에서 장시간 소결된 시편의 경우 냉각 시 상전이가 일어나 다량의 단사정상이 상온에서 존재하였다. 저온 aging동안 등온상전이 속도는 산소분위기에서 소결한 시편보다 수소분위기에서 소결한 시편에서 낮게 나타났으며, 이러한 경향은 $Y_{2}$O$_{3}$의 고용량이 크고, 입자크기가 적은 시편일수록 증가하였다. 또한 2Y-TZP 시편에서는 입자크기에 상관없이 대부분의 정방정상이 단사정상으로 빨리 등온상전이를 일으켰으나, 3Y-TZP 시편의 경우, 등온상전이는 입자크기가 증가함에 따라 상전이 속도도 증가하였다.

  • PDF

Densification of $Si_3N_4$ Cera,ocs by Two Step Gas Pressure Sintering (2단계 가스압 소결에 의한 질화규소의 치밀화)

  • 이상호
    • Journal of the Korean Ceramic Society
    • /
    • v.35 no.7
    • /
    • pp.659-664
    • /
    • 1998
  • Densification behavior of $Si_3N_4$ ceramics by two step gas pressure sintering was compared with pres-sureless sintering one step gas pressure sintering or hot isostatic pressing. While it was difficult to get the highly interlocked ${\beta}-Si_3N_4$ microstructure during the pressureless sintering due to decomposition above $1800^{\circ}C$ gas pressure sintering could solve this problem by increasing the densification temperature 2MPa of nitrogen pressure was enough to inhibit the decomposition up to $1890^{\circ}C$ and especially two step gas pres-sure sintering applying comparatively low pressure(2MPa) until the closed pore stage and then high pres-sure(10MPa) after pore closure could increase the hardness and the toughness.

  • PDF

Sintering agents with 2-dimensional layered structure and the enhancement of sinterability of cerium oxide using them (2차원 층상구조를 갖는 소결조제와 이를 활용한 세륨산화물 소결성 향상)

  • Park, Ji Young;Oh, Jae Myoung;Park, Hee Jung
    • Journal of the Korean Crystal Growth and Crystal Technology
    • /
    • v.29 no.1
    • /
    • pp.1-5
    • /
    • 2019
  • The physical properties of ceramic materials including oxides are greatly influenced by the material density. Therefore, various efforts have been made to increase the material density. One of the most popular strategies is to use sintering additives in sintering materials. The conventional sintering additive was a spherical powder having a three-dimensional structure. In this study, sintering additive with 2-dimensional (2D) layer structure was used to increase the sintering density of cerium oxide and its effect was confirmed. In this study, 1 nm-thick $TiO_x$ and $MnO_x$ nanosheets were used as sintering additives.

Densification Study of K+-beta-aluminas Prepared from Their Ultra-fine Milled Powder (초미세 분쇄 분말로 제조된 K+-beta-aluminas의 치밀화 연구)

  • Shin, Jae-Ho;Kim, Woo-Sung;Lim, Sung-Ki
    • Applied Chemistry for Engineering
    • /
    • v.16 no.5
    • /
    • pp.648-652
    • /
    • 2005
  • A super ionic conductor, $K^+$-beta-aluminas, which is known to be difficult to obtain in the form of dense sintered density under atmospheric pressure, was pulverized to 350 nm mean particle size using attrition mill. The sample were pressed into tablet form by uniaxial pressing. The specimen was sintered under atmospheric pressure in powder form. Sintering temperature range was $1400^{\circ}C$ to $1650^{\circ}C$ at $50^{\circ}C$ intervals. Additionally, zone sintering was carried out to control the growth grain at high temperature ($1600^{\circ}C$). The density of specimens that were sintered at $1600^{\circ}C$ and $1650^{\circ}C$, and sintered at $1600^{\circ}C$ by zone sintering were about 93% and 95%, respectively. In the case of the lengthened sintering time to 2 h, the density of specimen was reduced to lower than 90%, since the particles were grown to the duplex microstructure.

A Study on the Fabrication of Porous Sintered Materials for Glass Mold (유리 금형용 다공질 소결재의 제조에 관한 연구)

  • Jang Tae-Suk;Lim Tae-Whan
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.6 no.6
    • /
    • pp.468-472
    • /
    • 2005
  • In order to prevent adhering of molten glass on a mold wall, the wall is swabbed with lubricant oil before forming. However, the swabbing process can be removed from the entire processes of the glass forming if the mold wall is made of a porous sintered material. The purpose of the present study is to manufacture a sintered material(having a sintered density of $85{\~}90\%$)which is the most appropriate into. plane material for a glass mold. For the research, SUS310L-based coarse powder (${\~}150{\mu}m$) and SUS420J2-based fine powder ($40{\~}50{\mu}m$) were used for the compact materials, and effects of compaction pressure and sintering condition(atmosphere, temperature) were investigated. The results obtained were as fellows. (1) By means of solid phase sintering, a desired sintering density could not be achieved in any case when using a 310L-based powder having a large particle size. (2) When sintering green compacts(compaction pressure of $2ton/cm^2$) in a commercial vacuum furnace(at $1300^{\circ}C$ for 2 hours), the sintered compacts had densities of $6.2g/cm^3(79\%)$ for 310L + 0.03$\%$B, $6.6g/cm^3 (86\%)$ for 420J2, $7.3g/cm^3(95\%)$ for 420J2+(0.03)$\%$B, and $7.6g/cm^3(99\%)$ for 420j2+(0.06)$\%$B, respectively. As a result, it is regarded that sintered compacts having a desired porosity may be achieved by vacuum sintering the 420J2-based powder (low pressure compaction) and the 310L+0.03$\%$B-based powder (high pressure compaction).

  • PDF

Microwave hybrid sintering of NTC themistor (마이크로파 하이브리드 소결법에 의한 NTC 서미스터의 제조)

  • 최영락;안진용;안주삼;백동규;최승철
    • Journal of the Korean Crystal Growth and Crystal Technology
    • /
    • v.8 no.3
    • /
    • pp.508-512
    • /
    • 1998
  • The NTC thermistors were sintered by using microwave hybrid heating method at $1100^{\circ}C$~$1300^{\circ}C$ and those electrical properties were investigated. The obtained $B_{25^{\circ}C/85^{\circ}C}$ values from temperature dependence of electrical resisitivity were around 3100~3200 K which were almost the same values as conventionally sintered ones. Compared with conventional sintering process, this process could complete whole sintering process within 20 minutes. This the processing time and energy consumption could be reduced through this rapid heating by using microwave hybrid heating.t there were showed only two peaks, glycolide melting peak and lower molecular weight melting peak without lauryl alcohol. Conversion increased slowly with the reaction time up to 50 minutes, and then gave a sudden increase above that. The reaction time to disappear in glycolide melting peak during polymerization was shortened with the increase of lauryl alcohol content. Zero-shear viscosity of polyglycolic acid decreased with the increase of free acid content in glycolide.ssional energy and bending hysteresis increased. \circled3 Surface characteristics such as friction coefficient and thickness variation of highly shrinkage fabrics became relatively roughened state. \circled4 Since stiffened and roughened characteristics of highly shrinkage fabrics, drapabilities of them were significantly lowered. Additionally thermal insulation property of high shrinkage fabric was higher than that of low shrinkage fabric due to bulky and thickened feature. From the results, it is considered that the silk fabrics with high filling shrinkage have the good bulkiness and heat keeping properties and thus they have the suitable characteristics for high quality men's and women's formal garments.

  • PDF

Fabrication and characteristics of NTC thermistor for low temperature sintering (저온 소결용 NTC 서미스터의 제조 및 특성)

  • Koo, Bon Keup
    • Journal of the Korean Crystal Growth and Crystal Technology
    • /
    • v.28 no.1
    • /
    • pp.28-37
    • /
    • 2018
  • In order to study the NTC thermistor that can be fired at low temperature, the influence of the lead free glass frit and $RuO_2$ addition on the electrical properties of the NTC thermistor of $Mn_{1.85}Ni_{0.25}Co_{0.9}O_4$ basic composition was studied. The sintering characteristics of the specimen sintered at $1000^{\circ}C$ with 10 wt% frit added to the basic NTC composition were similar to those of the specimen sintered at $1200^{\circ}C$ without frit. However, as the amount of frit increased, the electrical resistivity and B constant were increased. In order to reduce the resistance, NTC thermistor was prepared by adding 0, 2, and 5 wt% of $RuO_2$ to the composition containing 10 wt% of frit and sintered at $1000{\sim}1200^{\circ}C$, and sintering and electrical properties were measured. The electrical resistivity and the B constant tended to decrease with increasing $RuO_2$ content. However, the resistivity was the lowest at sintering temperature of $1000^{\circ}C$ and the resistance increased with increasing sintering temperature after 5 wt% $RuO_2$ addition. The NTC thermistor sintered at $1000^{\circ}C$ with 10 wt% frit and 5 wt% $RuO_2$ in the composition of NTC showed similar electrical properties and sintering characteristics when sintered at $1200^{\circ}C$ without added frit.

Effect of Calcination Temperatures on Microwave Dielectric Properties of (${Zn}_{0.8}{Mg}_{0.2}$)${TiO}_{3}$ (하소온도에 따른(${Zn}_{0.8}{Mg}_{0.2}$)${TiO}_{3}$계의 마이크로파 유전특성)

  • 심우성;방재철
    • Proceedings of the KAIS Fall Conference
    • /
    • /
    • pp.91-94
    • /
    • 2003
  • 하소온도에 따른 (Zn/sub 0.8.Mg/sub 0.2/)TiO₃ 마이크로파 유전체 세라믹스의 소결거동과 마이크로파 유전특성의 변화를 연구하였다. 저온소결을 위하여 0.45 wt.%Bi₂O₃와 0.55wt.%V₂O/sub 5/를 첨가하였으며, 1000℃이하의 온도에서 소결하여 치밀한 소결체를 얻을 수 있었다. 800℃~1000℃의 범위의 여러 온도에서 하소를 하고 소결 전ㆍ후의 존재상과 미세구조의 분석을 통하여, 하소한 분말에 존재하는 미반응상 및 이차상이 최소화 될 때 높은 Q×f/sub o/값을 갖는 것을 알 수 있었다. 1000℃에서 하소한 후 900℃에서 소결했을 때, 주상이 Hexagonal이고 미세구조가 균일하였으며, 이때 Q×f/sub o/ = 42,000㎓, ε/sub r/ = 22를 나타냈다.

  • PDF