Industry-Verified Manufacturing Data (2026)

Crucible

Based on aggregated insights from multiple verified factory profiles within the CNFX directory, the standard Crucible used in the Basic Metal Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Crucible is characterized by the integration of Crucible Body and Lid. In industrial production environments, manufacturers listed on CNFX commonly emphasize Graphite construction to support stable, high-cycle operation across diverse manufacturing scenarios.

A heat-resistant container designed to hold and melt materials at high temperatures within industrial processes.

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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.
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
  • The internal volume capacity of the crucible, determining the maximum amount of material it can hold. (liters (L) or cubic centimeters (cm³)) Standard Spec
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
    Covers the crucible to reduce heat loss, prevent contamination, or control atmosphere during processing.
    Material: Matching refractory material or compatible metal
  • Pouring Spout Optional
    A shaped edge or nozzle for controlled pouring of molten materials from the crucible.
    Material: Integrated with crucible body material
Engineering Reasoning
800-1800°C with 0.5-2.0 MPa internal pressure
Material yield strength reduction to 50% of room temperature value at 1650°C for alumina-silica refractories
Design Rationale: Thermal fatigue from cyclic heating/cooling exceeding 1000°C differentials, causing microcrack propagation via Paris' Law (da/dN = C(ΔK)^m) with C=1.2e-10 m/cycle and m=3.2 for refractory ceramics
Risk Mitigation (FMEA)
Trigger Thermal shock exceeding 300°C/min heating rate
Mode: Radial crack propagation through refractory lining
Strategy: Graded refractory design with zirconia inner layer (CTE 10.5×10^-6/K) transitioning to alumina outer layer (CTE 8.1×10^-6/K)
Trigger Chemical corrosion from molten slag with basicity index >1.5
Mode: Refractory dissolution at slag-crucible interface exceeding 2 mm/hour
Strategy: Magnesia-chrome lining with 60% MgO content and 15% Cr₂O₃ addition for slag resistance

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Crucible.

Melting Pot Refractory Vessel graphite crucible for metal melting ceramic crucible high temperature industrial crucible with pouring spout alumina crucible for basic metal manufacturing platinum crucible for precious metals

Applied To / Applications

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

Vacuum Induction Melting Furnace
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Industrial Ecosystem & Supply Chain DNA

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
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)
Media Compatibility
✓ Molten metals (aluminum, copper alloys) ✓ Ceramic glazes and frits ✓ Laboratory chemical analysis samples
Unsuitable: Hydrofluoric acid or fluoride-containing environments
Sizing Data Required
  • Maximum batch volume (liters)
  • Required heating rate (°C/min)
  • Process atmosphere (air, inert, vacuum)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Thermal shock cracking
Cause: Rapid temperature changes exceeding the crucible material's thermal expansion tolerance, often from uneven heating/cooling or direct flame impingement
Chemical corrosion/degradation
Cause: Reaction between crucible material (e.g., graphite, ceramic) and molten metals/alloys at high temperatures, accelerated by impurities or fluxing agents
Maintenance Indicators
  • Visible hairline cracks or crazing on crucible surface (especially at bottom or sidewalls)
  • Abnormal material loss or thinning detected during inspection, particularly at slag line or bottom
Engineering Tips
  • Implement controlled heating/cooling ramps (typically ≤200°C/hour for ceramics) and avoid direct flame contact with crucible walls
  • Match crucible material to specific alloy/process (e.g., alumina for copper, silicon carbide for iron) and maintain strict charge material purity

Compliance & Manufacturing Standards

Reference Standards
ISO 3585:1998 - Borosilicate glass 3.3 - Properties ASTM C146 - Standard Specification for Glass Containers (Borosilicate Glass) CE Marking (EU Directive 2014/35/EU for Electrical Equipment if heated)
Manufacturing Precision
  • Wall thickness: +/-0.5mm
  • Volume capacity: +/-2% of nominal
Quality Inspection
  • Visual inspection for cracks, bubbles, and inclusions
  • Thermal shock resistance test (e.g., ASTM C149)

Factories Producing Crucible

Verified manufacturers with capability to produce this product in China

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✓ 93% Supplier Capability Match Found

P Procurement Specialist from Germany Feb 28, 2026
★★★★★
"The technical documentation for this Crucible is very thorough, especially regarding technical reliability."
Technical Specifications Verified
T Technical Director from Brazil Feb 25, 2026
★★★★★
"Reliable performance in harsh Basic Metal Manufacturing environments. No issues with the Crucible so far."
Technical Specifications Verified
P Project Engineer from Canada Feb 22, 2026
★★★★★
"Testing the Crucible now; the technical reliability results are within 1% of the laboratory datasheet."
Technical Specifications Verified
Verification Protocol

“Feedback is collected from verified sourcing managers during RFQ (Request for Quote) and factory evaluation processes on CNFX. These reports represent historical performance data and technical audit summaries from our B2B manufacturing network.”

10 sourcing managers are analyzing this specification now. Last inquiry for Crucible from USA (20m ago).

Supply Chain Commonly Integrated Components

Signal Processor

Electronic device that conditions, amplifies, filters, and converts raw sensor signals into standardized outputs for temperature measurement systems

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Purge Air System

A system that provides controlled airflow to clear optical paths and protect sensors in molten metal temperature measurement applications.

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Degassing Chamber

A specialized vessel within a molten metal degassing system where dissolved gases are removed from molten metal through controlled processes.

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Gas Control System

A system that regulates and controls the flow, pressure, and composition of gases used in molten metal degassing processes.

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Frequently Asked Questions

What materials are best for crucibles in basic metal manufacturing?

Graphite and ceramic materials like alumina and silicon carbide are most common for basic metal manufacturing due to their high heat resistance, durability, and chemical stability at extreme temperatures.

How do I choose between different crucible materials?

Select crucible material based on your melting temperature, material compatibility, and process requirements. Graphite offers excellent thermal conductivity, ceramics provide chemical inertness, quartz allows visibility, and platinum handles precious metals.

What maintenance is required for industrial crucibles?

Regular inspection for cracks, proper preheating before use, careful handling to avoid thermal shock, and thorough cleaning between uses to prevent contamination are essential for maintaining crucible performance and longevity.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

Data Specifications verified by CNFX Industrial Index (v2.6.03) for Basic Metal Manufacturing sector.

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