Internal Bore Liner: Inner Diameter 10-200 mm, Length 50-500 mm

Q: 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.

Q: 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.

Q: 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.

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

Parameter	Typical range	Notes & selection driver
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

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

Standards

ISO 10081, DIN 51060, ASTM C20

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

View Product Details

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

Typical Suppliers & Equivalents

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

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Internal Bore Liner

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Frequently Asked Questions

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