Overview of Mullite Crucible

Mullite crucibles are made from a high-performance ceramic material composed primarily of alumina (Al₂O₃) and silica (SiO₂). Known for their excellent thermal stability and mechanical strength, mullite crucibles are widely used in high-temperature applications such as melting metals, glass, and ceramics. They offer superior resistance to thermal shock and chemical attack, making them indispensable in both laboratory and industrial settings.

Features of Mullite Crucible

Thermal Shock Resistance: Exceptional ability to withstand rapid temperature changes without cracking.
High Mechanical Strength: Strong and durable, even at elevated temperatures.
Chemical Stability: Resistant to most chemicals, ensuring minimal contamination during processes.
Temperature Range: Can operate effectively at temperatures up to 1650°C.
Low Thermal Expansion: Minimal expansion or contraction with temperature changes, ensuring dimensional stability.
Non-Reactive: Does not react with the materials being processed, preserving sample purity.
Versatility: Suitable for a wide range of applications including metallurgy, glass manufacturing, and laboratory experiments.

(High Temperature Resistance Corundum Mullite Ceramic Crucible for Gold Melting)

Specifications of High Temperature Resistance Corundum Mullite Ceramic Crucible for Gold Melting

High-temperature resistance corundum mullite ceramic crucibles are designed for melting gold and other precious metals. These crucibles combine corundum (aluminum oxide) and mullite (aluminum silicate) to achieve exceptional performance. The material ratio typically includes 70% corundum and 30% mullite. This blend ensures high mechanical strength and thermal stability. The maximum working temperature reaches 1800°C. This makes the crucible suitable for prolonged use in gold melting processes. Gold melts at around 1064°C. The crucible’s temperature tolerance provides a safety margin for varying furnace conditions.

Thermal shock resistance is a key feature. The crucible withstands rapid temperature changes without cracking. It can transition from 1000°C to room temperature repeatedly. This is critical for applications requiring frequent heating and cooling cycles. The low thermal expansion coefficient minimizes stress during temperature shifts.

Chemical stability ensures minimal interaction with molten metals. The crucible resists corrosion from acids, alkalis, and molten gold. This prevents contamination of the melted material. Purity is maintained even after multiple uses. The dense structure reduces porosity. This limits metal seepage into the crucible walls.

Standard dimensions vary to accommodate different melting volumes. Inner diameters range from 50mm to 200mm. Heights range from 70mm to 250mm. Wall thickness is typically 8-12mm. This balances heat retention and structural integrity. Capacities span 100ml to 2000ml. Maximum gold weight capacity ranges from 1kg to 20kg. Custom sizes are available for specialized needs.

Durability is superior to traditional graphite or clay crucibles. The material resists erosion from high-velocity molten metal flows. Service life is extended even under frequent use. Smooth inner surfaces simplify cleaning. Residual metal removal requires minimal effort.

Applications include jewelry making, laboratory testing, and industrial refining. The crucible works with electric resistance furnaces, induction furnaces, and gas-fired setups. Compatibility with multiple heating methods adds versatility. Handling precautions include avoiding mechanical impact during heating. Thermal gradients must be controlled during initial heating to prevent stress fractures. Proper preheating protocols ensure optimal performance.

(High Temperature Resistance Corundum Mullite Ceramic Crucible for Gold Melting)

Applications of High Temperature Resistance Corundum Mullite Ceramic Crucible for Gold Melting

High-temperature resistance corundum mullite ceramic crucibles are widely used for melting gold in industries like jewelry making, metallurgy, and laboratory research. These crucibles handle extreme heat well, making them ideal for processes requiring repeated heating and cooling. Their main material is a mix of corundum and mullite, which gives them high strength and stability under intense temperatures. This combination prevents cracks or damage even during rapid temperature changes, a common issue in gold melting.

Gold melts at 1064°C, but furnaces often reach higher temperatures to ensure full liquefaction. Standard crucibles might fail under these conditions, but corundum mullite crucibles stay durable. Their low thermal expansion rate reduces stress from heating cycles. This extends their lifespan compared to graphite or clay alternatives.

Chemical resistance is another key feature. Gold melting involves fluxes and additives that can corrode weaker materials. Corundum mullite resists acids, alkalis, and molten metals, keeping the gold pure. This is critical for producing high-quality results in jewelry or industrial refining.

These crucibles work in electric, gas, and induction furnaces. Their versatility suits small-scale artisans and large factories. Users save money over time because the crucibles rarely need replacing. Their smooth interior surface also minimizes gold sticking, reducing waste.

Handling is straightforward. The crucibles withstand mechanical shocks during loading and unloading. Care is still needed to avoid sudden impacts when hot. Preheating before first use improves performance. Regular inspections for wear help maintain efficiency.

Custom sizes and shapes are available for specialized setups. This adaptability makes them useful in gold recycling, alloy production, and research labs testing new melting techniques. Consistent results matter in these fields, and reliable crucibles play a big role.

Proper maintenance ensures long-term use. Cleaning after each melt removes residue that might affect future batches. Storing in a dry place prevents moisture damage. Following these steps keeps the crucibles in top condition for repeated gold melting tasks.

Company Introduction

Welcome to Teen-Hot,a leading global supplier of high-quality crucibles designed for various industrial applications. We offer an extensive range of crucibles, including graphite, ceramic, and metal varieties, tailored to meet the needs of foundries, laboratories, and manufacturers. Our products are renowned for their durability, thermal resistance, and precision engineering, ensuring optimal performance in melting and heat treatment processes. With advanced manufacturing facilities and a commitment to excellence, we provide reliable, cost-effective solutions worldwide. Partner with us for your crucible needs and experience superior quality, expert support, and timely delivery.

If you have any questions, please feel free to contact us(nanotrun@yahoo.com).

Payment Methods

T/T, Western Union, Paypal, Credit Card etc.

Shipment Methods

By air, by sea, by express, as customers request.

5 FAQs of High Temperature Resistance Corundum Mullite Ceramic Crucible for Gold Melting

What is the maximum temperature this crucible can handle?
The crucible withstands temperatures up to 1800°C. It combines corundum and mullite for enhanced thermal stability. This mix ensures minimal cracking or deformation under extreme heat. Regular use near the limit may shorten its lifespan.

Why pick corundum mullite over other materials?
Corundum mullite resists thermal shock better than pure alumina or silicon carbide. It maintains strength during rapid heating or cooling. The material also resists chemical corrosion from molten metals. This reduces contamination risks during gold melting.

How long does the crucible last?
Lifespan depends on operating conditions. Frequent use at maximum temperature may cause wear within weeks. Proper preheating and avoiding sudden temperature changes extend durability. Inspect for cracks or thinning before each use.

Is it safe for melting pure gold?
Yes. The crucible’s high-purity composition prevents reactions with gold. No additives or binders leach into the melt. This ensures the gold remains uncontaminated. Clean the crucible thoroughly after each use to avoid residue buildup.

Any special handling steps needed?
Preheat the crucible slowly to 500°C before full use. This removes moisture and prevents thermal stress. Avoid placing cold metals directly into a hot crucible. Let it cool naturally after melting. Store in a dry environment to prevent cracking from humidity.

(High Temperature Resistance Corundum Mullite Ceramic Crucible for Gold Melting)