汝瓷之科學驗證

Abstract

本研究對中國清涼寺汝瓷破片(083006-b-2)進行微結構、成分、光學性質的分析，根據鈣鋁矽氧化物三元相圖(主成分之間比例)與破片成分分析(主成分/助熔劑=92.33/8.27)設計出三種玻璃(CAS-F)進行釉藥之模擬，其中氧化矽與氧化鈣固定比例(86/14)，並對氧化鋁進行調整。以可見光反射光譜探討微結構對於持溫時間(5小時、50小時)及反應氣氛之影響。利用空氣、5%氫氮混合氣以及三種碳材(木屑、煤炭、中間相碳素微球)經由高溫氣化所提供之還原氣氛進行比較。三種配方(CAS-F)皆可在1275 oC下熔融，模擬的汝釉經由長時間熱處理後具有汝瓷特徵，包含鈣長石、玻璃相分解、氣泡等，並採用一氧化碳/二氧化碳氣氛， 1250 oC/5 h處理後，其中之一樣品可顯示近似汝瓷破片之反射光譜。

One piece of Ru-shard (083006-b-2) from Qingliangsi (清涼寺) at Henan province in China has been investigated on microstructure, composition, and optical properties. Three glaze compositions (CAS-F series) are selected based on the CAS/F ratio of 92.33/8.27 based on the glaze composition of Ru-shard. Parent melts (CAS) is selecting from the CaO-Al2O3-SiO2 (CAS) ternary diagram with a constant SiO2/CaO ratio of 86/14, and adjusted Al2O3 contents. Visible reflective spectrometry is used to investigate the effects of dwell time (5 hr or 50 hr) and reducing atmosphere on the microstructure. Air, 5%H2-N2, and gasses from gasification three kinds of carbon materials (wood-chips (WC), Indonesia subbituminous coal (IS), meso carbon micro beads (MCMB)) are also used for comparison. Melting points of CAS-F series are all below 1275 oC. The imitated Ru-glasses by strong reduction show the characteristics of typical Ru-glaze, such as anorthite grain in glass, dual phase by decomposition, bubbles after long heating treatment. Also, one glaze formulation appears the spectrum similar to that of Ru-shard if treated by a CO/CO2 reducing atmosphere at 1250 oC for 5 h.