Preparation formula and method of porcelain glaze for high temperature sealing

一种高温封结用瓷釉的配制配方及方法

Abstract

The invention discloses a preparation formula and a method of porcelain glaze for high temperature sealing. The formula comprises the following components in proportion by weight: 47.4% of red lead powder, 25.6% of boric acid, 20.8% of silicon oxide, 2.3% of aluminum oxide, 2.3% of chromic oxide and 1.6% of barium carbonate. The preparation method of the porcelain glaze comprises the following steps: (1) fully and evenly mixing the raw materials according to the formula and filling the mixture into a graphite crucible; (2) after heating a high temperature well type electric furnace to 1350-1400 DEG C, putting the graphite crucible into the high temperature well type electric furnace, and sintering at the temperature range for 4-6 hours; (3) taking an sintered porcelain glaze molten mass out of the electric furnace, quickly pouring into cold water so that the molten mass is cooled suddenly and turns into an porcelain glaze clinker; and (4) after the porcelain glaze clinker is cooled and dried, adding porcelain balls with the diameter of 10mm-25mm and the total weight same as the weight of the porcelain glaze clinker, putting the porcelain glaze clinker and the porcelain balls into a ball milling drum, carrying out ball milling for more than 32 hours, and then passing a 100 mesh sieve to obtain the porcelain glaze powder. The porcelain glaze powder prepared as required is widelyapplied to the manufacturing of thermocouples and can meet the requirement of high temperature sealing.
本发明公开了一种高温封结用瓷釉的配制配方及方法,配方的各成分重量比为:红丹粉47.4%,硼酸25.6%,二氧化硅20.8%,三氧化二铝2.3%,三氧化二铬2.3%,碳酸钡1.6%;其配制方法包括以下步骤:(1)依上述配方,将原料充分混合均匀,装入石墨坩埚里;(2)将高温井式电炉加热至1350~1400℃后,把石墨坩埚放入,在此温度范围内烧结4~6小时;(3)将烧结好的瓷釉熔融体,从电炉中取出,迅速倒入冷水中,使其骤然冷却,变成瓷釉熔块;(4)瓷釉熔块冷却、干燥后,加入直径为10mm~25mm、总重量与瓷釉熔块重量相同的瓷球,一起放入球磨筒内,球磨32小时以上;然后过100目的筛子,即成瓷釉粉料。采用按要求配制的瓷釉粉已大量应用到热电偶制造中,都能满足其高温封结要求。

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