INDUSTRY COMPONENT

Internal Bore Liner

Internal bore liner for molten metal flow control nozzles in metal casting and foundry applications.

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Component Specifications

Definition
A precision-engineered cylindrical component installed within the bore of molten metal flow control nozzles to provide wear resistance, thermal insulation, and dimensional stability during continuous or intermittent metal pouring operations in foundries and casting facilities.
Working Principle
The internal bore liner creates a protective barrier between the molten metal stream and the nozzle body, reducing thermal shock, preventing erosion, and maintaining consistent flow characteristics by withstanding extreme temperatures (typically 600-1600°C) and chemical interactions with various molten alloys.
Materials
High-alumina refractory ceramic (Al2O3 content: 85-99%), zirconia-toughened alumina (ZTA), silicon carbide (SiC), or boron nitride composites; selected based on metal type, temperature, and required service life.
Technical Parameters
  • Length 50-500 mm
  • Density 2.8-3.9 g/cm³
  • Porosity < 15%
  • Inner Diameter 10-200 mm
  • Wall Thickness 5-25 mm
  • Compressive Strength > 200 MPa
  • Operating Temperature 600-1600°C
  • Thermal Shock Resistance ΔT > 500°C
Standards
ISO 10081, DIN 51060, ASTM C20

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Internal Bore Liner.

bore liner molten metal nozzle refractory liner foundry components metal flow control casting nozzle liner ceramic liner high-temperature liner Internal Bore Liner Internal Bore Liner in Basic Metal Manufacturing

Parent Products

This component is used in the following industrial products

Molten Metal Flow Control Nozzle

Precision ceramic nozzle for regulating molten metal flow in casting and refining operations

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Engineering Analysis

Risks & Mitigation
  • Thermal cracking from rapid temperature changes
  • Chemical erosion from reactive metals
  • Mechanical failure from improper installation
  • Flow restriction from buildup or damage
FMEA Triads
Trigger: Thermal shock during rapid heating/cooling cycles
Failure: Radial cracking leading to liner disintegration
Mitigation: Use graded thermal expansion materials and controlled preheating procedures
Trigger: Chemical interaction with specific alloying elements
Failure: Surface erosion and bore diameter enlargement
Mitigation: Select chemically compatible liner materials for each metal type
Trigger: Mechanical stress from misalignment during installation
Failure: Fracture during operation causing flow disruption
Mitigation: Implement precision installation tools and alignment verification procedures

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Inner diameter: ±0.5%, Concentricity: < 0.2 mm TIR, Surface finish: Ra < 6.3 μm
Test Method
Dimensional verification per ISO 8015, thermal shock testing per ASTM C1171, chemical analysis per XRF/XRD methods

Buyer Feedback

★★★★☆ 4.9 / 5.0 (36 reviews)

"The Internal Bore Liner we sourced perfectly fits our Basic Metal Manufacturing production line requirements."

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"The technical documentation for this Internal Bore Liner is very thorough, especially regarding technical reliability."

Related Components

Valve Body
Valve body is the main structural housing of a molten metal flow control valve, designed to withstand extreme temperatures and corrosive environments while directing metal flow.
Refractory Liner
Refractory liner for molten metal flow control valves, providing thermal insulation and erosion resistance in extreme temperature applications.
Rotary Impeller
A high-speed rotating impeller used in molten metal degassing systems to inject inert gases and remove impurities.
Probe Assembly
High-temperature sampling probe for molten metal composition analysis in metallurgical processes

Frequently Asked Questions

What is the primary function of an internal bore liner in molten metal nozzles?

To protect the nozzle body from thermal degradation and erosion while maintaining consistent flow geometry and preventing metal contamination.

How often should internal bore liners be replaced?

Replacement intervals depend on metal type, temperature, and throughput; typically 50-500 pouring cycles or when dimensional tolerance exceeds ±1.5% of original bore diameter.

Can the same liner be used for different molten metals?

No, liners are material-specific due to different chemical interactions; aluminum requires different liners than steel or copper alloys.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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Intermetallic Phases Internal Microstructure