All Issue

2024 Vol.34, Issue 3 Preview Page

Research Article

Characteristics of Pyrophyllite Powder Molding Material by High-Speed, High-Pressure Dynamic Compression Technology

고속고압 동적 압축 기술에 의한 연납석 분말 성형 재료 특성

Jeongdu Noh1
,
Sangyeon Ban2
,
Taeyoon Oh2
,
Jangbok Wi3
,
Seong-Seung Kang4*
노 정두1
,
반 상연2
,
오 태윤2
,
위 장복3
,
강 성승4*
1Researcher, Engineering Technology Institute of Chosun University
2Student, Department of Energy and Resources Engineering, Chosun University
3Senior Managing Director, Jeongjin E&C Co., Ltd.
4Professor, Department of Energy and Resources Engineering, Chosun University
1조선대학교 공학기술연구원 연구원
2조선대학교 첨단에너지공학과 학부생
3(주)정진이앤씨 전무이사
4조선대학교 에너지자원공학과 교수
*Corresponding Author
30 September 2024. pp. 403-413
PDF XML Citation
Abstract

This study aims to investigate the material properties of specimens made from pyrophyllite and pyrophyllite-aluminum mixed powders using high-speed, high-pressure dynamic compression technology. The aluminum powder exhibited a highly uniform particle size distribution ranging from 10 to 100 µm, whereas the pyrophyllite powder displayed four distinct particle size distributions: 0.1~1 µm, 1~10 µm, 80~100 µm, and 200~1,000 µm. Using high-speed, high-pressure dynamic compression technology with a drop time of approximately 0.34~0.4 seconds and a dynamic load of about 207 tonf, it was possible to fabricate pyrophyllite and pyrophyllite-aluminum mixed powder specimens with a volume of about 548 mm². The Shore hardness measurement results showed that specimen BG100 had an average of 43.7, BG90 had an average of 33.2, and BG85, BG80, BG75, and BG70 had an average of 31.0, indicating that the specimen with the least aluminum content exhibited the highest Shore hardness value. The thermogravimetric analysis revealed mass losses at two points: the first mass loss occurred at around 270°C with a loss of approximately 1.45%, and the second mass loss occurred at around 600°C, where BG70 and BG80 showed a mass loss of about 2.53%, and BG75, BG85, and BG90 showed a mass loss of about 3.43%. Scanning electron microscopy analysis indicated that the microstructure of the specimens was similar regardless of the mixing ratio, with three elements—O, Si, and Al—being detected in all specimens. The mapping analysis of BG90 revealed an oxygen weight ratio of 50.80%, silicon weight ratio of 37.36%, and aluminum weight ratio of 11.85%. In the case of BG85, the results were 43.09% oxygen, 43.50% silicon, and 13.41% aluminum; for BG80, the results were 44.83% oxygen, 40.30% silicon, and 14.87% aluminum; for BG75, the results were 44.71% oxygen, 35.49% silicon, and 19.80% aluminum; and for BG70, the results were 34.95% oxygen, 35.73% silicon, and 29.32% aluminum.

Keywords
high-speed
high-pressure dynamic compression
pyrophyllite
powder molding
Shore hardness
thermogravimetric analysis

본 연구는 고속고압 동적 압축 기술을 이용하여 연납석 및 연납석-알루미늄 혼합 분말 성형 시편을 제작하고, 그 시편에 대한 재료 특성을 살펴보는데 있다. 알루미늄 분말의 입도는 10~100 µm 내로 매우 균일하게 분포하는 반면, 연납석 분말은 0.1~1 µm, 1~10 µm, 80~100 µm, 200~1,000 µm 등 크게 4가지 입도분포를 보였다. 낙하 시간은 약 0.34~0.4초, 동적하중 약 207 tonf의 고속고압 동적 압축 기술을 이용하여 체적이 약 548 mm2인 연납석 및 연납석-알루미늄 혼합 분말 시편 제작이 가능하였다. 쇼어 경도 측정 결과, 시편 BG100은 평균 43.70, BG90은 평균 33.20, BG85, BG80, BG75, BG70 등은 평균 31.00으로, 알루미늄이 가장 적게 함유된 시편의 쇼어 경도 값이 가장 높게 나타났다. 열중량 분석 결과, 2지점에서 질량 손실이 발생하였으며, 1차 질량 손실은 약 270°C에서 약 1.45% 발생하였고, 2차 질량 손실은 약 600°C에서 BG70과 80은 약 2.53%, BG75, 85, 90은 약 3.43% 질량 손실이 발생함을 보였다. 주사전자현미경 분석 결과, 배합비에 따라 시편의 미세구조는 비슷하게 나타났으며, 시편 모두에서 O, Si, Al 등 3개의 원소가 검출되었다. BG90의 맵분석 결과 산소 중량비는 50.80%, 규소 중량비는 37.36%, 알루미늄 중량비는 11.85%로 분석되었다. BG85의 경우 산소 43.09%, 규소 43.50%, 알루미늄 13.41%, BG80의 경우 산소 44.83%, 규소 40.30%, 알루미늄 14.87%로 나타났다. BG75의 경우 산소 44.71%, 규소 35.49%, 알루미늄 19.80%, BG70은 산소 34.95%, 규소 35.73%, 알루미늄 29.32%로 나타났다.

키워드
고속고압 동적 압축
연납석
분말 성형
쇼어 경도
열중량 분석
References
1

Altindag, R., Guney, A., 2006, ISRM suggested method for determining the Shore hardness value for rock, International Journal of Rock Mechanics and Mining Sciences, 43(1), 19-22.

10.1016/j.ijrmms.2005.04.004
2

Babu, S.S., Love, L., Dehoff, R., Peter, W., Watkins, T.R., Pannala, S., 2015, Additive manufacturing of materials: Opportunities and challenges, MRS Bulletin, 40, 1154-1161.

10.1557/mrs.2015.234
3

Ergun, Y.A., 2019, Mechanical properties of epoxy composite materials produced with different ceramic powders, Journal of Materials Science and Chemical Engineering, 7(12), 1-8.

10.4236/msce.2019.712001
4

Ha, T.K., Sung, H.J., Ahn, S., Chang, Y.W., 2003, Powder injection molding technology, Transactions of Materials Processing, 12(6), 521-528 (in Korean with English abstract).

10.5228/KSPP.2003.12.6.521
5

Han, J.S., 2021, Metal/ceramic powder injection molding technology, Journal of the KSME, 61(12), 40-45 (in Korean).

6

Han, O.S., Han, I.S., 2014, Explosion hazards of aluminum powders with the variation of mean diameter, Journal of the Korean Institute of Gas, 18(4), 21-26 (in Korean with English abstract).

10.7842/kigas.2014.18.4.21
7

Kang, J., Park, S.H., Park, K., 2024, Enhanced mechanical properties of PUMA/SiO2 ceramic composites via digital light processing, Polymers, 16(2), 193.

10.3390/polym16020193
8

Kim, J.Y., Park, J.J., 1997, Prediction of relative density by hardness in compressed sintered-metal powder, Journal of the Korean Society of Technology of Plasticity, 6(6), 508-516 (in Korean with English abstract).

9

Ko, Y.B., Kim, J.S., Hwang, C.J., 2006, Development of dental scaler tip and powder injection mold, Proceedings of the Korean Powder Metallurgy Institute Conference, Changwan, 36-37 (in Korean).

10

KSRM (Korean Society for Rock Mechanics and Rock Engineering), 2010, Rock standard test method, 1-123 (in Korean).

11

Liao, Y., Rubbi, F., Mao, B., Li, B., Delzendehrooy, F., Merajul Haque, M., 2024, A novel solid-state metal additive manufacturing process - Laser-induced Supersonic Impact Printing (LISIP): Exploration of process capability, Additive Manufacturing, 93, 104356.

10.1016/j.addma.2024.104356
12

Moon, I.H., Lee, W.J., 1987, Molding technology of powder, The Korean Institute of Metals and Materials, Powder Metallurgy Institute, 75-90 (in Korean).

Information
  • Publisher :Korean Society of Engineering Geology
  • Publisher(Ko) :대한지질공학회
  • Journal Title :The Journal of Engineering Geology
  • Journal Title(Ko) :지질공학
  • Volume : 34
  • No :3
  • Pages :403-413
  • Received Date : 2024-09-09
  • Revised Date : 2024-09-20
  • Accepted Date : 2024-09-25
  • DOI :https://doi.org/10.9720/kseg.2024.3.403
Journal Informaiton The Journal of Engineering Geology The Journal of Engineering Geology
Online Submission
  • NRF
  • KOFST
  • KISTI Current Status
  • KISTI Cited-by
  • crosscheck
  • orcid
  • open access
  • ccl
Journal Informaiton Journal Informaiton - close