Graphite Crucible

Graphite crucibles play a vital role in various industries, including
metallurgy, foundries, jewelry manufacturing, and more. These crucibles are
essential for melting, casting, and refining metals at high temperatures. 
Classification of Graphite Crucibles: Crucibles can be categorized into three
groups: graphite crucibles, clay crucibles, and metal crucibles. YIDA as a
lesding  Leading Supplier in China, specializes in manufacturing two types of
graphite crucibles: machined graphite crucibles and graphite clay crucibles.
Due to variations in performance, applications, and environmental conditions,
the raw materials, production methods, technologies, and product specifications
also differ. Natural crystalline graphite serves as the primary raw material
for graphite crucibles, allowing them to retain the physical and chemical
properties of natural graphite. These crucibles exhibit excellent thermal
conductivity and high-temperature resistance. They have a low coefficient of
thermal expansion during high-temperature applications and possess anti-strain
properties in sudden cold and hot environments. Moreover, graphite crucibles
demonstrate remarkable chemical stability in acidic and alkaline environments,
showcasing strong corrosion resistance. With a wide range of sizes available,
graphite crucibles are not limited by production scale, quantity, or smelting
materials. They can be manufactured in any size and quantity while ensuring the
purity of the smelting materials. As a result of their superior properties,
graphite crucibles find extensive use in metallurgy, foundry, machinery,
chemical, and other industrial sectors for smelting alloy tool steels, non-
ferrous metals, and their alloys. They offer significant technical and economic
benefits.
Machined graphite crucibles
Machined graphite crucibles, also known as high-purity graphite crucibles, are
primarily machined using high-purity and high-density graphite materials, such
as molded graphite material and isostatic graphite material. These crucibles
are tailored to customers' specifications. Depending on the materials being
melted, machined graphite crucibles can be further classified into steel
melting crucibles, copper melting crucibles, gold melting crucibles, and
analysis crucibles. Additionally, we can produce graphite arcs for various
applications.
Gold Refining Crucibles: Crucibles used for melting gold require raw materials
with high purity and density. They should have a bulk density higher than
1.85g/cm3 and a total ash content of less than 50ppm. Gold melting crucibles
are typically machined from high-purity, high-density, fine-grained graphite.
The raw materials for these crucibles include molded graphite and isostatic
graphite.
Uranium Salt Refining Graphite Crucibles: These crucibles are large-sized
graphite crucibles, commonly available in sizes such as Ф400mm × 700mm and
Ф500mm × 800mm. The manufacturing process involves selecting high-quality,
low-ash petroleum coke and then crushing, milling, blending, kneading,
extrusion molding (or shaping), roasting, multiple impregnation, and
graphitization purification. The primary raw material for these crucibles is
isostatic graphite material.
Graphite clay crucibles
Graphite clay crucibles, also known as SiC graphite crucibles, consist mainly
of silicon carbide (SiC) and graphite. They are primarily used for melting
copper, aluminum, and other common metals. These crucibles have a relatively
low cost and offer a large molten metal capacity. The main molding method for
these crucibles is pressure forming.
Important guidelines for crucible usage:
Store the crucibles in a dry place to prevent exposure to rain. Before use,
slowly bake them up to 500 degrees Celsius.
The crucible should be filled based on its capacity, avoiding excessive
pressure that could lead to metal cracking due to thermal expansion.
When removing the molten metal, it is best to use a spoon and minimize the use
of calipers or other tools. If tools are necessary, they should match the shape
of the crucible to avoid generating excessive localized stress that could
shorten the crucible's lifespan.
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