Silicon carbide crucible use method 1

First, 坩埚 put into the furnace, Zui is waiting for its own red transparent, first put a small amount of metal scrap at the bottom of the sputum, and then put the metal ingot (the metal ingot must be placed on the edge of the furnace before baking), so as not to be cold The ingots are placed directly into the crucible, causing the crucible to burst and burst. It is also necessary to ensure that these materials have sufficient expansion space when heated in the crucible, otherwise the crucible is easily squeezed.

Second, the baked metal ingots must be slowly placed vertically into the crucible. If placed sideways, the thermal expansion of the ingot can easily break the crucible. Care must be taken when feeding the crucible. Zui is good to use the clamp to carefully put the ingot and heavier material into the crucible. Never use a dumping method, the edges and corners of the ingot may be cracked.

Third, in the process of use, when the metal water in the crucible is too small, do not feed too much at one time, so that it is easy to make the metal water in the crucible cool and solidify. Then, when the temperature rises again, the metal expands and breaks.

Use of additives

1. The additive must be added in strict accordance with the specified amount, and the excess additive will shorten the life of the crucible.

2. The additive should never be placed in an open or solid metal. It should be added to the middle of the molten metal after the metal is completely dissolved, and slowly and evenly stirred to avoid direct contact of the additive with the steroid.

3. When adding a sheet or block additive, use a bell jar to immerse it in the metal solution.

Factory direct sales of gold and steel smelting aluminum silicon carbide graphite crucible (central with mouth) DZ1000 preheating

1. The enamel ceramic products have a certain number of pores in the wall, which is easy to absorb moisture. Therefore, before using the mash for the first time, it must be preheated to ensure that no moisture remains in the wall: It is baked at the temperature of the furnace for more than 24 hours. During this time, it is rotated several times to uniformly heat it, and the moisture in the wall is removed (or the appropriate amount of wood is placed in the crucible for about 3 hours to reach Preheating effect). In order to avoid the temperature rise too fast, causing the thermal expansion, the bottom, delamination or burst.

Note: moisture generally evaporates at 75100 degrees, so the temperature must be slow at this temperature; after 2 hours, preheat to 150-200 degrees and keep warm for one hour, then rise 150 degrees per hour. Since the ruthenium wall will undergo rapid oxidation in the temperature range of 315-650 degrees, oxidation will not only shorten the life of the crucible, but also affect the performance of the crucible due to the decrease in thermal conductivity, so it is not necessary to stay in this temperature interval for too long. .

2. After 预* preheating, it is usually used continuously without reheating unless it is exposed to a humid environment again.

3. After preheating, the operator needs to quickly heat up to 850-950 degrees without adding material, and keep it for half an hour, then drop to the normal use temperature, and then feed. (heating it so that its temperature is higher than the normal operating temperature will prolong the service life of the crucible.) Usually heating the crucible to 815-930 degrees will help the enamel protection of the crucible. If possible, this high temperature heating can be weekly. Have a 坩埚