Effect of ice-quenching on the change in hardness of a Pd-Au-Zn alloy during porcelain firing simulation
Source abstract
Abstract
This study examined the effect of ice-quenching after degassing on the change in hardness of a Pd-Au-Zn alloy during porcelain firing simulations. By ice-quenching after degassing, the specimens were softened due to homogenization without the need for an additional softening heat treatment. The lowered hardness by ice-quenching after degassing was recovered greatly from the first stage of porcelain firing process by controlling the cooling rate. The increase in hardness during cooling after porcelain firing was attributed to the precipitation of the f.c.t. PdZn phase containing Au, which caused severe lattice strain in the interphase boundary between the precipitates and matrix of the f.c.c. structure. The final hardness was slightly higher in the ice-quenched specimen than in the specimen cooled at stage 0 (the most effective cooling rate for alloy hardening) after degassing. This was attributed to the more active grain interior precipitation during cooling in the ice-quenched specimen after degassing.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Advanced materials and composites · Electrical and Thermal Properties of Materials · Dental materials and restorations
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Dental Materials, Institute of Translational Dental Science and BK21 PLUS Project, School of Dentistry, Pusan National University
References (19)
Show source-provided references
1. 1) Yamamoto M. Metal-ceramics: principles and methods of Makoto Yamamoto. Chicago: Quintessence Publishing; 1985. p.15-25.
2. 2) Wang JN, Liu WB. A Pd-free high gold dental alloy for porcelain bonding. Gold Bull 2006; 39: 114-120.10.1007/BF03215538 ↗
3. 3) Suleiman SH, Vult von Steyern P. Fracture strength of porcelain fused to metal crowns made of cast, milled or laser sintered cobalt-chromium. Acta Odontol Scand 2013; 71: 1280-1289.10.3109/00016357.2012.757650 ↗
4. 4) Chew CL, Norman RD, Stewart GP. Mechanical properties of metal-ceramic alloys at high temperature. Dent Mater 1990; 6: 223-227.10.1016/S0109-5641(05)80002-8 ↗
5. 5) O’Brien WJ. Dental materials and their selection. 3rd ed. Chicago: Quintessence Publishing; 2002. p. 204.
6. 6) Prakash P, D’Souza D, Kumar M, Viswambaran M. Effect of firing cycle and surface finishing on the sag resistance of long span metal ceramic framework using base metal alloys-an in vitro study. Med J Armed Forces India 2012; 68: 145-150.10.1016/S0377-1237(12)60016-1 ↗
7. 7) Jeon BW, Kim SM, Kim HI, Kwon YH, Seol HJ. Hardening effect of pre- and post-firing heat treatment for a firing simulated Au-Pd-In metal-ceramic alloy. Gold Bull 2014; 47: 255-261.10.1007/s13404-014-0149-6 ↗
8. 8) Fischer J, Fleetwood PW. Improving the processing of high-gold metal-ceramic frameworks by a pre-firing heat treatment. Dent Mater 2000; 16: 109-113.10.1016/S0109-5641(99)00086-X ↗
9. 9) German RM. Hardening reactions in a high-gold content ceramo-metal alloy. J Dent Res 1980; 59: 1960-1965.10.1177/00220345800590110601 ↗
10. 10) Hisatsune K, Hasaka M, Sosrosoedirdjo BI, Udoh K. Agehardening behaviour in a palladium-based dental porcelain fused alloy. Mater Charact 1990; 25: 177-184.10.1016/1044-5803(90)90008-8 ↗
11. 11) Kim SM, Kim HI, Kwon YH, Seol HJ. Change in hardness of an as-cast and softening heat-treated low-gold-content alloy for bonding porcelain by simulated porcelain firing and its mechanism. Gold Bull 2015; 48: 39-46.10.1007/s13404-015-0158-0 ↗
12. 12) Yu YJ, Seol HJ, Cho MH, Kim HI, Kwon YH. Hardening by cooling rate control and post-firing heat treatment in Pd-Ag Sn alloy for bonding porcelain. Dent Mater J 2016; 35: 309-315.10.4012/dmj.2015-189 ↗
13. 13) Vermilyea SG, Cai Z, Brantley WA, Mitchell JC. Metallurgical structure and microhardness of four new palladium-based alloys. J Prosthodont 1996; 5: 288-294.10.1111/j.1532-849X.1996.tb00513.x ↗
14. 14) Kim YH, Mitsuo N, Masaaki N, Toshikazu A, Toru K, Hisao F. Mechanism of unique hardening of dental Ag-Pd-Au-Cu alloys in relation with constitutional phases. J Alloys and Compd 2012; 519: 15-24.10.1016/j.jallcom.2011.10.099 ↗
15. 15) Guo WH, Brantley WA, Clark WA, Monaghan P, Mills MJ. Transmission electron microscopic investigation of a Pd-AgIn-Sn dental alloy. Biomaterials 2003; 24: 1705-1712.10.1016/S0142-9612(02)00564-1 ↗
16. 16) Pan LG, Wang JN. Age-hardening behavior of a low-gold dental alloy. J Mater Sci Mater Med 2007; 18: 171-177.10.1007/s10856-006-0677-6 ↗
17. 17) Massalski TB. Binary alloy phase diagrams. Materials Park: ASM International; 1990. p. 3068-3070.
18. 18) Villars P, Calvert LD. Pearson’s handbook of crystallographic data for intermetallic phases. Metals Park: American Society for Metals; 1985. p. 3026.
19. 19) Cullity BD. Elements of X-ray Diffraction. 2nd ed. Massachusetts: Addison-Wesley publishing; 1978. p. 506-507.