Glaze Formula: Cost-Effective Flux System
Glaze Formula: Cost-Effective Flux System
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釉料配方：经济高效的助焊剂系统
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发表时间：
2016
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通讯作者：
L. Bourgy
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文献类型：
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作者：
L. Bourgy
Imerys Ceramics的白色助焊剂是一种含有锂的钠钾长石混合物。存款中天然存在的锂使白色焊剂比传统的混合晶石更易熔。为了达到高纯度，Imerys Ceramics决定对其白色助焊剂进行处理，以消除任何不合适元素的痕迹。这种智能的无化学品工艺，使白色助焊剂非常干净，适用于白色和高品质的陶瓷配方。白色助焊剂具有良好的碱平衡（Li 2 O、K2 O、Na 2 O），可提供卓越的熔融性。此外，由于其烧结温度低，它还提供：·低烧釉的高效率·具有良好表面外观的高质量釉料-低含量杂质可防止釉料缺陷·更经济的配方-重新配制后，Imerys Ceramics的白色助焊剂可以取代昂贵的助焊剂，如性能相似的霞石正长岩·环保配方-与大多数锂晶石不同，白色助焊剂氟含量低。白色焊剂的发色团氧化物的典型含量为0.19质量%（TiO 2和Fe 2 O3，表1）。1）。在烧制过程中产生的白度使白色助焊剂与发色团含量较低的超级超钠长石处于同一水平（图1）。与钠长石相比，锂基长石的熔融性特征在于早期收缩（图2）。这个早期的烧结点允许釉料开始软化并与釉料的其他成分反应。这种反应性将导致更快的玻璃相形成，同时消化其他组分。该玻璃相的粘度是主要的控制参数，以便获得锂基长石的全部益处。然而，较早的熔点也意味着气体从陶瓷体逸出的时间更短。因此，必须调整釉料配方，以允许玻璃相形成以开始不同组分的消化，同时允许来自坯体的气体不被捕获在玻璃相中。釉料配方：经济高效的助熔剂系统
Imerys Ceramics’ White Flux is a mixed sodium and potassium feldspar containing lithium. The natural presence of lithium in the deposit makes White Flux more fusible than traditional mixed feldspars. To reach a high level of purity, Imerys Ceramics decided to process its White Flux to eliminate any traces of unsuitable elements. This smart chemical-free process, makes White Flux very clean, suitable for white and high-quality ceramic formulas. White Flux presents a good balance of alkali (Li2O, K2O, Na2O) allowing an exceptional fusibility profile. In addition, thanks to its low sintering temperature, it offers: • high efficiency in low firing glazes • high-quality glazes with good surface aspect – low level of impurities prevents defects in glazes • more economical formulas – after reformulation, Imerys Ceramics’ White Flux can replace expensive fluxes like nepheline syenite with similar performance • environmentally friendly formulas – unlike most lithium feldspars, White Flux has a low level of fluorine. The typical content of chromophore oxides of the White Flux is 0,19 mass-% (TiO2 and Fe2O3, Tab. 1). The whiteness developed during the firing puts White Flux at the same level as the Super Extra Sodium Feldspar, which has a lower chromophore content (Fig. 1). The fusibility of the lithium-based feldspar is characterised by an early shrinkage compared to sodium feldspars (Fig. 2). This early sintering point allows the glaze to start softening and reacting with other components of the glaze. This reactivity will lead to a quicker glass phase formation with the digestion of other components. The viscosity of this glass phase is the main control parameter in order to obtain the full benefit of the lithium-based feldspar. Nevertheless, an early melting point also means less time for the gases to escape from the ceramic body. Therefore, the glaze formula has to be adjusted to allow the glass phase formation to start the digestion of different components and at the same time, to allow gases from the body not to be trapped in the glass phase. Glaze Formula: Cost-Effective Flux System