Among other filters such as light filter, wave filter, air filter, ultra filter and filter paper, a novel adsorption filter from thermostable polyester nonwoven fabrics immobilized with functional super activated carbon by means of quinoline soluble, activateable isotropic pitch binder were developed in this study. The activated carbon precursor is available in the market branded as coconut shell based activated carbon(CCS-AC) produced by Dongyang Carbon Co. Ltd. BET-surface area of this precursor was 1,355 m2/g, after KOH-activation it increased over 2,970 m2/g and was named as super activated carbon. In the preliminary research, this precursor was impregnated with PdCl2(0.188 wt%) KMnO4(3 wt%) and redox-agent(CuCl2, 0.577 wt%) in order to promote TOF up to 100/h and Selectivity up 99% and patented as a functional AC for the ethylene adsorption. The enhancement of the isotropic pitch binder to the AC-immobilized adsorption filter was BET-surface area upgraded by 266 m2/g and promoted the Iodine- and MB-adsorption by 1.4 times, respectively and also micro pore wide ranges 〈 5a~30 a 〉.

Pure WC or WC with low Co concentration less than 0.5 wt.% is studied to fabricate high density WC/Co cemented carbide using vacuum sintering and post HIP process. Considering the high melting point of WC, it is difficult to consolidate it without the use of Co as binder. In this study, the effect of lower Co addition on the microstructure and mechanical properties evolution of WC/CO was investigated. By HIP process after vacuum sintering, hardness and density was sharply increased. The hardness values was using binderless WC.

The microstructure and hardness of (W,Ti)C cemented carbides with a different metallic binder composition of Ni and Co fabricated by powder technology were investigated. The densifications of the prepared materials were accomplished by using vacuum sintering at . Nearly full dense (W,Ti)C cemented carbides were obtained with a relative density of up to 99.7% with 30 wt.% Co and 99.9% with 30 wt.% Ni as a metallic binder. The average grain size of the (W,Ti)C-Co and the (W,Ti)C-Ni was decreased by increasing the metallic binder content. The hardness of the dense (W,Ti)C-15 wt%Co and (W,Ti)C-15 wt%Ni, was greater than that of the other related cemented carbides; in addition, the cobalt-based cemented carbides had greater hardness values than the nickel-based cemented carbides.

일반적으로 아스팔트 개질재의 경우 아스팔트 바인더의 고온 점성을 증가시킬 뿐만 아니라 믹싱 및 포설온도에서의 점도 또한 증가시켜 높은 생산온도 및 시공온도를 요구하게 된다. 이와 달리 Wax의 경우 아스팔트 바인더의 강성을 증가시키기도 하지만 일정 온도가 넘으면 물처럼 유동성을 확보해 믹싱 및 포설온도에서의 점도를 낮추어 작업성을 높이는 효과가 있다. 본 연구에서는 실내실험을 통해 PE Wax가 아스팔트 바인더에 첨가되었을 경우 그 특성을 분석하였다. 이를 위해 SBS, 폐타이어 고무분말 개질 아스팔트 바인더와 비교 분석하였다. 또한 Wax가 기존 개질재인 SBS, 폐타이어 고무분말과 함께 사용되었을 경우 그 효과를 분석하였다. 실험 결과, Wax type I은 내유동성 강화에 큰 효과가 있으며 작업성 개선에 약간의 효과가 있는 것으로 나타났다. Wax type II는 아스팔트 바인더의 작업성 개선에 크게 기여하고, 상온에서 부드러운 특성으로 균열에 대한 저항성을 증진시키는 것으로 나타났다.

There are several methods determining an appropriate performance grade of virgin binder, which is re(erred as design binder, in RAP contained bituminous mixture design process. However, difficulties have been experienced in utilizing the methods in the field application in Korea, because SHRP binder test, the key tests to determine a design binder, requires well-trained personnel, high price equipment, and time consuming process. Thus, the study investigated the relationship among the binder aging level, RAP contents, and rheologica1 properties of binder. The study results provide mix designer with a simple method in selecting an appropriate grade of virgin binder.

A new extra-fine grade Ni powder (XF Ni) has demonstrated increased sintering activity in Co-Fe-Ni binders for diamond tool applications. XF Ni has the advantage of significantly lower cost than XF Co. Up to 30% of XF Co was substituted with XF Ni while maintaining comparable apparent hardness and transverse rupture strength to pure Co binders. Ni substantially increased the diffusion of Fe. Diamond tool producers can take advantage of the improved sintering properties of XF Ni powder to substantially lower material costs.

Premixes treated with a binder, such as in the FLOMET process, exhibit better flow, reduced dusting and segregation and improved productivity and part consistency compared to conventional premixes. The binder treatment is highly suitable for high performance P/M applications which often require premixes containing very fine alloying additives and excellent die filling characteristics. With this process, various binders and lubricants can be utilized in order to make premixes with unique properties. In this paper, the characteristics and performances of bonded premixes are reported.

The amorphous alloy strip was pulverized to get a flake-shaped powder after annealing at for 90 min and subsequently ground to obtain finer flake-shaped powder by using a ball mill. The powder was mixed with polyimide-based binder of , and then the mixture was cold compacted to make a toroidal powder core. After crystallization treatment for 1 hour at , the powder was transformed from amorphous to nanocrystalline with the grain size of . Soft magnetic characteristics of the powder core was optimized at with the insulating binder of 3wt%. As a result, the powder core showed the outstanding magnetic properties in terms of core loss and permeability, which were originated from the optimization of the grain size and distribution of the insulating binder.

In this paper, we show some experimental results of binder-free WC sintered by Pulsed Electric Current Sintering (PECS) also known as Field Assisted Sintering Technology (FAST). These binder-free WC have extremely hardness and stiffness. However, these mechanical properties are dependent on the sintering condition, e.g., maximum temperature, applied pressure, etc. We show some relationship between mechanical properties and sintering condition to improve to sinter the binder-free WC.

Organic binders are usually pre-mixed with ceramic powders to enhance the formability during the shape forming process. These binders, however, must be eliminated before sintering in order to avoid pore formation and unusual grain growth during sintering. The present work was performed to investigate the effects of residual binder on grain growth behavior during sintering of piezoelectric ceramics. The microstructures of sintered samples were examined for various thermal processes and atmosphere at debinding. Addition of binder seems to promote abnormal grain growth especially in incompletely debinded regions and to make the grain shape change from corner-rounded to faceted.

In this experimental work, the development of a multicomponent binder system based on high density polyethylene (HDPE) and paraffin wax for Powder Injection Molding of Alumina parts was carried out. The optimum composition of the injection mixture was established through mixing torque measurements and a rheological study. The maximum powder loading was 58 vol%. The miscibility of organic components and the optimum injection temperature was evaluated by thermal characterization of binder and feedstock. The thermal debinding cycle was developed on the basis of thermogravimetrical analysis of the binder. After sintering the densities achieved were closed to 98% of the theoretical one.

The filling property of the binder treated iron based powder made of atomized iron powder was compared with that of the one made of reduced iron powder. The latter one showed a better filling property than the former one, although the original reduced powder showed a worse flow rate. Changing the particle size distribution of the original atomized powder from wide to narrow like the original reduced iron powder, improved the filling property of the binder treated powder. As a result, the particle size distribution of the original iron powder was found to strongly affect the filling property of the binder treated powder.

본 논문은 가열 재생아스팔트 흔합물의 성능을 향상시키기 위한 방법을 개발하기 위한 연구의 일부분이다. 새로이 개발된 혼합 방법은 회수 아스팔트 포장의 기존 바인더를 훨씬 많이 회생시켜 재생 혼합물에서 균일한 바인더의 정도를 갖게 한다. 본 연구의 목적은 새로이 개발된 혼합 방법으로 제조된 재생아스팔트 혼합물의 소성변형 저항 특성을 평가하는 것이다. 두 종류 골재(편마암 화강암), RAP의 두 가지 함량(15, 30%), LDPE의 두 가지 첨가량(0, 6%)를 이용하였으며, 혼합방법은 바인더의 불균등 상태를 개선하기 위한 두 가지 방법, 즉 일반적인 기존의 A 방법과 새롭게 개발한 F 방법을 이용하였다. 재생 혼합물 내의 바인더 산화 정도의 차를 조사하기 위하여 GPC분석을 실시하였고, 흔합 방법에 따른 소성변형 저항성을 평가하기 위하여 각 혼합 방법에 따라 제작한 재생 흔합물을 휠 트랙킹 시험과 변형강도를 측정하였다. 소성변형 저항 특성과 변형강도와의 상관관계는 기존의 A 방법보다 새롭게 개발된 F 방법이 더 높게 나타나, F 방법으로 제조된 혼합물의 품질이 보다 일관성 있는 소성변형 저항성을 나타내는 것을 알 수 있었다.

바인더의 노화로 인한 성능변화는 침입도 또는 점도시험을 실시하여 판정하여왔다. 기존의 시험방법으로 아스팔트 바인더의 점탄성 특성과 실제거동을 평가할 수 없기 때문에 새로운 분석방법이 요구되어 왔다. 본 연구에서는 기존시험 방법을 사용하여 침입도지수와 잔류침입도를 판정하였고, 양방향 반복회전 모드와 일방향 반복회전 모드 시험을 실시하여 단기 노화된 아스팔트 바인더의 유변학적 특성을 분석하였다. 시험결과 단기 노화된 아스팔트 바인더는 시험주기(frequency) 즉, 차량속도의 변화에 따라 서로 다른 복합계수와 위상각을 나타냈으며 단기 노화 전후의 크리프 컴플라이언스 및 전단점도 시험결과에도 영향을 미치는 것으로 나타나서 포장 설계시 이러한 특성이 고려되어야 한다.

아스팔트 바인더 Stiffness와 혼합물의 변형강도 및 동적크리프 특성과의 상관성 분석을 토대로 혼합물의 소성변형 저항성 (내변형성) 추정을 위한 Kim test의 적용성을 고찰하였다. 본 연구는 골재 2종류, AC 60-80 및 이를 개질한 총 8종류의 바인더로 총 16가지 혼합물을 제조하였다. DSR로 각 바인더의 G*/sineδ를 측정하였으며 Kim test의 변형강도와 동적크리프 시험의 최종변위(FD)와 동적안정도(DS)를 각 혼합물로부터 측정하였다. 바인더의 G*/sineδ와 소성변형 관련 3가지 특성(SD. FD, DS)과의 상관성 분석 결과 G*/sineδ와 SD와 상관성이 가장 높은 것으로 나타났다 (R2=0.88) 이는 혼합물에 내재해 있는 내변형성의 차이를 Kim test가 더 잘 구분해 낼 수 있음을 의미한다. 또한 DS와 SD의 회귀분석 결과, R2이 약 0.84 이상을 보여 변형강도는 동적크리프 시험의 동적안정도와 좋은 상관성을 가짐을 확인하였다. 따라서 본 연구를 통하여 아스팔트 혼합물의 내변형성 평가시 Kim test의 활용 가능성이 매우 높음을 확인하였다.