Crucible for High-Temperature Melting

Product Specifications

Technical details and manufacturing context for Crucible

Definition

A crucible is a fundamental component within industrial systems, serving as a specialized container that withstands extreme temperatures to melt, calcine, or chemically process raw materials such as metals, alloys, ceramics, or chemicals. It functions as the primary vessel where high-temperature reactions or phase changes occur, enabling processes like smelting, refining, casting, or synthesis. Crucibles are critical for maintaining material purity, controlling thermal conditions, and facilitating efficient heat transfer from external sources to the contained substances. In basic metal manufacturing, crucibles are used in foundries and laboratories for melting and alloying. They are available in various materials, including graphite, ceramics (e.g., alumina, silicon carbide), quartz, and platinum, each offering distinct thermal and chemical properties. Key parameters to consider when selecting a crucible include capacity (typically 0.5–50 L), maximum operating temperature (1200–1800 °C), thermal shock resistance (≥10 cycles per ISO 28764), density (1.8–3.2 g/cm³ per ASTM C20), porosity (≤20% per ASTM C20), wall thickness (5–30 mm), dimensional tolerance (±1.5 mm per ISO 2768-m), weight (2–100 kg), material grade (e.g., 99.7% Al₂O₃ per GB/T 5593), and maximum working pressure (0.1–0.5 MPa). These values are typical reference ranges and must be verified for the specific model and application with the manufacturer or supplier. The crucible's design ensures uniform heating and structural integrity under thermal expansion and mechanical loads. Proper selection and maintenance are essential to prevent contamination, cracking, or failure. Always consult the manufacturer for detailed specifications and compliance with relevant standards.

Working Principle

The crucible operates by containing materials within its cavity while being subjected to external heating (e.g., from furnaces, induction coils, or flames). Its construction from refractory materials allows it to endure thermal stress without degrading, melting, or contaminating the contents. Heat is transferred through the crucible walls to the materials inside, raising their temperature to achieve melting, chemical reactions, or phase transitions. The crucible's shape and material properties ensure uniform heating, minimal heat loss, and structural integrity under thermal expansion and mechanical loads.

Common Materials

Graphite, Ceramic (e.g., alumina, silicon carbide), Quartz, Platinum

Technical Parameters

Parameter	Typical range	Notes & selection driver
Capacity	0.5–50 L	Typical range for industrial melting applications
Maximum Operating Temperature	1200–1800 °C	Depends on material; above limit causes deformation or failure
Thermal Shock Resistance	≥10 cycles	Number of cycles without crackingISO 28764
Density	1.8–3.2 g/cm³	Higher density improves strength and corrosion resistanceASTM C20
Porosity	≤20 %	Lower porosity reduces slag penetrationASTM C20
Wall Thickness	5–30 mm	Affects thermal conductivity and mechanical strength
Tolerance on Dimensions	±1.5 mm	Ensures fit in furnaceISO 2768-m
Weight	2–100 kg	Varies with size and material
Material Grade	99.7 % Al₂O₃	High purity alumina for high temperature stabilityGB/T 5593
Maximum Working Pressure	0.1–0.5 MPa	For pressure-assisted melting processes

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Crucible Body
The main container that holds materials, designed to resist high temperatures and thermal shock.

Material: Refractory material (e.g., graphite, ceramic)
Lid Optional Part
Covers the crucible to reduce heat loss, prevent contamination, or control atmosphere during processing.

Material: Matching refractory material or compatible metal
Pouring Spout Optional Part
A shaped edge or nozzle for controlled pouring of molten materials from the crucible.

Material: Integrated with crucible body material

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Crucible.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Vacuum Induction Melting Furnace

View system integration details

Manufacturers of Crucible

Manufacturer profiles associated with Crucible.

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Frequently Asked Questions

What materials are crucibles made of?

Common materials include graphite, ceramics (e.g., alumina, silicon carbide), quartz, and platinum. Each material offers different thermal conductivity, chemical resistance, and maximum operating temperature.

How do I choose the right crucible capacity?

Capacity depends on the volume of material to be processed. Typical industrial crucibles range from 0.5 to 50 liters. Consider the furnace size and batch requirements.

What is the maximum operating temperature?

It varies by material, typically between 1200°C and 1800°C. Exceeding this limit can cause deformation or failure. Always verify the specific rating for your crucible.

How is thermal shock resistance measured?

Thermal shock resistance is the number of heating/cooling cycles a crucible can withstand without cracking. It is tested according to ISO 28764, with a typical minimum of 10 cycles.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Atmospheric to 1.5 bar (vacuum to low positive pressure)
other spec:	Slurry concentration: Up to 60% solids by weight (viscosity dependent)
temperature:	Up to 1800°C (dependent on material)

Crucible

Product Specifications

Industry Taxonomies & Aliases

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards