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Change of optical properties and microstructure of an Ag-Pd-In alloy according to Ag content

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Á¶¼ö¿¬ ( Cho Su-Yoen ) - ºÎ»ê´ëÇб³ Ä¡ÀÇÇÐÀü¹®´ëÇпø Ä¡°úÀç·áÇб³½Ç
Á¶¹ÌÇâ ( Cho Mi-Hyang ) - ¿ø±¤º¸°Ç´ëÇб³ Ä¡±â°ø°ú

Abstract

º» ¿¬±¸¿¡¼­´Â Ag-Pd-In°è Çձݿ¡¼­ Ag, Pd, InÀÇ Á¶¼º¿¡ µû¸¥ »ö»óÀÇ º¯È­¸¦ ±Ô¸íÇÏ°íÀÚ Pd¿Í InÀ» Áß·®ºñ·Î 1:1·Î ÇÏ°í, AgÀÇ ÇÔ·®À» 0-100 wt.%·Î º¯È­½ÃÄÑ ½ÃÆíÀ» Á¦Á¶ÇÏ¿© ºÐ±¤±¤µµ°è·Î ±¤ÇÐÀû Ư¼ºÀ» ÃøÁ¤ÇÏ°í Á¶¼º¿¡ µû¸¥ ±¤ÇÐÀû Ư¼ºÀÇ º¯È­ ¹× ÀÌ¿Í °ü·ÃµÈ ¹Ì¼¼±¸Á¶ÀÇ º¯È­¸¦ Á¶»çÇÏ¿´´Ù. Áß·®ºñ·Î 1:1ÀÇ Pd-In Çձݿ¡¼­ AgÀÇ Ã·°¡·®ÀÌ 40 wt.% ÀÌ»óÀÏ °æ¿ì 100 % Au ½ÃÆí°úÀÇ »öÂ÷°¡ Á¡Á¡ Ä¿Áö´Â °ÍÀ¸·Î ³ªÅ¸³µ´Ù(p<0.001). ¸íµµÁö¼öÀÎ L*Àº ½ÃÆíÀÇ AgÀÇ ÇÔ·®ÀÌ ³ô¾ÆÁú¼ö·Ï Áõ°¡ÇÏ¿´´Ù(p<0.001). a*¿Í b*´Â Ag°¡ 20 wt.% ±îÁö ÷°¡µÈ °æ¿ì Áõ°¡ÇÏ¿´À¸³ª AgÀÇ ÇÔ·®ÀÌ ´õ ¸¹¾ÆÁü¿¡ µû¶ó Á¡Á¡ °¨¼ÒÇÏ¿´´Ù(p<0.001). Ag°¡ ÇÔÀ¯µÇÁö ¾ÊÀº ½ÃÆíÀº ÁÖÁ¶»óÅ¿¡¼­ ´ÜÀÏ»ó À̾úÀ¸³ª, AgÀÇ ÇÔ·®ÀÌ 20 wt.% ÀÌ»óÀÎ °æ¿ì, »óºÐ¸®°¡ ÀϾ ±âÁö¿Í µ§µå¶óÀÌÆ® ȤÀº ÀÔÀÚÇü ±¸Á¶¸¦ ÀÌ·ç´Â 2»óÀÌ È®ÀεǾú´Ù. µ§µå¶óÀÌÆ® ȤÀº ÀÔÀÚÇü ±¸Á¶´Â InPd»óÀ̾úÀ¸¸ç, ±âÁö´Â Ag-rich»óÀ¸·Î ÀÌ·ç¾îÁ® ÀÖ¾ú´Ù. À̷κÎÅÍ Ag ÇÔ·®ÀÌ 20-70 wt.%ÀÎ ½ÃÆíÀº L*°ªÀÌ ³ô°í a*¿Í b*°ªÀÌ ³·Àº Ag ±âÁö¿Í, L*°ªÀÌ ³·°í a*¿Í b*°ªÀÌ ³ôÀº InPd µ§µå¶óÀÌÆ® ±¸Á¶°¡ ÇÕÃÄÁø 2»ó ±¸Á¶À̸ç, AgÀÇ ÇÔ·®ÀÌ Áõ°¡ÇÒ¼ö·Ï µ§µå¶óÀÌÆ® ±¸Á¶¿¡ ´ëÇÑ ±âÁöÀÇ ºñÀ²ÀÌ ³ô¾ÆÁö¸é¼­ ¿¬ÇÑ ³ë¶õ»ö¿¡¼­ Àº¹é»öÀ¸·Î »ö»óÀÌ ¹Ù²î¾ú´Ù.

In this study, change of optical properties and microstructure of an Ag-Pd-In alloy according to Ag content was investigated. For this purpose, specimen alloys were prepared by adding 0-100 wt.% of Ag to the 50Pd-50In (wt.%) alloy. When the content of Ag was more than 40 wt.%, the color difference with pure gold specimen was increased(p<0.001). L* value increased as the Ag content of the specimen increased, but a* and b* value increased until the addition of 20 wt.% Ag, and then decreased with increasing Ag content(p<0.001). Ag-free specimen was single phase in the as-cast state, but when the content of Ag was more than 20 wt.%, the phase separation occurred and two phases of matrix and dendrite or granular structure were confirmed. The dendrite or granular structure was composed of the InPd phase, and the matrix was composed of the Ag-rich phase. From these results, it can be concluded that the specimens with Ag content of 20-70 wt.% have the Ag-rich matrix which has a high L* value and low a* and b* value, and have the dendrite structure which has a low L* value and high a* and b* value. As the content of Ag increased, the color changed from light yellow to silver white due to the increase in the ratio of the matrix to the dendrite or granular structure.

Å°¿öµå

Ag-Pd-In°è ÇÕ±Ý; ±¤ÇÐÀû Ư¼º; ¹Ì¼¼±¸Á¶; µ§µå¶óÀÌÆ®
Ag-Pd-In alloy; optical properties; microstructure; dendrite

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