JP2020070225A - Black tenmoku tea bowl burnished in rayleigh-scattered light (blue) and spectral spectrum (iridescent) of white light, and manufacturing method of same - Google Patents

Abstract

To provide a black tenmoku glaze and a method for producing a tea bowl using the glaze characterized by Rayleigh scattered light (blue) and spectral spectrum (iridescent) of white light.SOLUTION: In order to lower a melting temperature range of the glaze to 700-850°C, an equilibrium phase of a solid-liquid two layers of alkali feldspar sodium/potassium solid solution is used, and fine particles of kurohama (magnetite) used for black glaze are further crushed into colloidal ultrafine particles and used in combination with a red pattern of iron ore. Further, a heat treatment step for growing twin crystal of sodium oxide in the form of a crystal group in a reduction gradual cooling step is incorporated in the known production method of a black tenmoku tea bowl, which is produced by the reaction between the low-temperature treatment activated quicklime produced in an oxidation calcination process at 700-900°C and the sodium feldspar in the liquid phase. Produced in this way are a black tenmoku glaze and a glazed tea bowl burnished in the Rayleigh blue scattered light and in the iridescent spectral spectrum.SELECTED DRAWING: Figure 4

Description

黒色釉薬では、カリ長石を主に調合されていてナトリウム長石はあまり使われていない。着色鉄石は紅柄（酸化第二鉄）の微粒子で、貫入防止にカオリン質粘土、燒結硬化に珪酸質陶石、陶石の溶融温度の引き下げに土灰を主に非結晶質の石灰石が配合されていて還元燒成（１２４０〜１２５０℃）で造られている。釉薬の長石、珪石等のガラス化釉層の反射光に耀く黒天目茶碗は、完成の域に技術開発は達している。  In the black glaze, potassium feldspar is mainly mixed, and sodium feldspar is not used much. Colored iron ore is fine particles of red pattern (ferric oxide), kaolin clay is used to prevent intrusion, siliceous porcelain stone for sinter hardening, and clay ash, mainly amorphous limestone, is used to lower the melting temperature of porcelain stone. It is made by reduction firing (1240-1250 ° C). The technical development has reached the completion area of the Black Tenmoku tea bowl, which is tinged by the reflected light of the vitrified glaze layer of glazing feldspar and silica stone.

黒天目茶碗の見込みに掛ける本発明の釉薬（図１Ｂ）を素燒の胎土に薄目に掛けて酸化・還元燒成を図２の工程に準じて行い本発明の光彩を放つ黒色茶碗を得た（図４Ｂ）。  Applying the glaze of the present invention (Fig. 1B), which is expected to be a black tea bowl, to the placenta of unglazed rice to thinly oxidize and reduce it to obtain a brilliant black tea bowl of the present invention. (FIG. 4B).

茶碗の外側（表層）には公知の黒天目釉薬（図１Ａ）を掛け茶碗の見込には本発明の釉薬（図１Ｂ）を掛けて酸化・還元燒成（図３）の製造工程を実施してレイリー散乱青色光彩および白色光の分光虹色に耀く黒天目茶碗を造ることができた（図４Ｂ）。  A known black glazed glaze (FIG. 1A) is applied to the outer side (surface layer) of the tea bowl, and the glaze of the present invention (FIG. 1B) is applied to the expectation of the tea bowl to carry out the production process of oxidation / reduction firing (FIG. 3). As a result, it was possible to create a black Tenme bowl that was tinged with the Rayleigh scattered blue light and the spectral iridescence of white light (Fig. 4B).

本発明品茶碗の見込釉薬Ｂの調合割合を示す図。The figure which shows the compounding ratio of the glaze B of the bowl of this invention product. 本発明の酸化・還元燒成工程でおこる化学反応説明図。Explanatory drawing of the chemical reaction that occurs in the oxidation / reduction firing process of the present invention. 本発明の燒上げ還元燒成（１２４０〜１２５０℃）工程で泡立った釉薬の泡痕および胎土と釉薬層界面に沈積したコロイド状の超微粒が放つレイリー散乱光（青色）の写真３Ａ−本発明茶碗の表面；３Ｂ−同品の見込の胎土と釉薬の界面図。Photograph 3A of the Rayleigh scattered light (blue) emitted by the foam traces of the glaze that foamed during the step of reducing and firing the glaze (1240 to 1250 ° C.) of the present invention and the colloidal ultrafine particles deposited at the interface between the body and the glaze layer (the present invention) Surface of tea bowl; 3B-interface diagram of expected placenta of the same product and glaze. 本発明の製造徐冷却工程で結晶化した酸化ナトリウムの双晶写真図４Ａ；本発明の製造工程で作陶した白色分光の虹色に耀く黒天目茶碗の内側見込写真図４Ｂ。Twin crystal photograph of sodium oxide crystallized in the production slow cooling step of the present invention FIG. 4A; Inner prospective photograph of the black-spectrum teacup tinged with the rainbow-colored white spectrum produced in the production step of the present invention.

Claims (8)

黒天目釉薬に調合するアルカリ長石はＯｒ^※３６±２０ Ａｂ^※６４±２０の溶融開始温度８００℃以下のものを配合する。（注：Ｏｒ＝カリ長石 Ａｂ＝ナトリウム長石）The alkali feldspar to be added to the Kuromame glaze is Or ^* 36 ± 20 Ab ^* 64 ± 20 with a melting start temperature of 800 ° C or less. (Note: Or = potassium feldspar Ab = sodium feldspar) 石灰石には天然に産する鼠石の様な非結晶の反応性の高いものを配合する。（例：葛生・赤坂石灰石）  Limestone is mixed with non-crystalline highly reactive substances such as naturally occurring rat stone. (Example: Kuzuu and Akasaka limestone) 含鉄鉱石には紅柄（微粒子）と熱分解してコロイド状の超微粒子（１２００℃還元燒成工程で可視光線波長の１／４〜１／６）になる四三酸化鉄少量を併用添加する。  To iron-bearing ores, a small amount of red iron oxide (fine particles) and a small amount of iron trioxide that is thermally decomposed to become colloidal ultrafine particles (1/4 to 1/6 of the visible light wavelength in the 1200 ° C reduction reduction process) are added together. .. カオリン系粘土でない水打粘土（ＳｉＯ_２ ６０％、Ａｌ_２Ｏ_３ １７％）等を貫入剥離防止、釉薬の流下を防ぐ効果等を期待し少量添加する。A small amount of water-cast clay (SiO ₂ 60%, Al ₂ O ₃ 17%) or the like that is not kaolin-based clay is added in anticipation of the effects of preventing penetration and peeling, and preventing glaze from flowing down. 酸化鉄の懸濁分散と燒締め硬化作用を有す珪酸質陶石を少量添加調合する。  Add and mix a small amount of siliceous porcelain stone that has the effect of suspending and dispersing iron oxide and tightening and hardening. 生石灰の液相ナトリウム長石との反応（７００〜１０００℃）で酸化ナトリウムと灰長石が生成する酸化燒成工程（図２反応▲１▼）。  Oxidation and sintering step in which sodium oxide and anorthite are produced by the reaction of quicklime with liquid phase sodium feldspar (700 to 1000 ° C) (Fig. 2, reaction (1)). 含鉄鉱石の微粒子黒浜（四三酸化鉄）をコロイド状の超微粒子に熱分解で砕粒化（図２反応▲２▼）して茶碗胎土と釉薬界面にレイリー散乱青色光を反射する酸化鉄を沈積する製造工程（図３製造工程▲１▼）。  Fine particles of iron-bearing ores Kurohama (ferric tetroxide) is pulverized into colloidal ultrafine particles by thermal decomposition (reaction (2) in Fig. 2) and iron oxide that reflects Rayleigh scattered blue light is deposited on the interface between the tea bowl and the glaze. Manufacturing process (FIG. 3 manufacturing process (1)). 還元徐冷却工程で酸化ナトリウムの双晶結晶群（写真４Ａ）が出現する製造工程（図３製造工程▲３▼）。  A manufacturing process in which a twin crystal group of sodium oxide (Photo 4A) appears in the reduction gradual cooling process (FIG. 3, manufacturing process (3)).