INDUSTRY COMPONENT

Backface

The backface is the rear structural surface of a turbine wheel that provides axial support and maintains rotor integrity under high-speed rotational forces.

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Component Specifications

Definition
In turbine wheel assemblies, the backface is the critical rear-facing structural component that serves as the primary axial load-bearing surface. It interfaces with the rotor shaft and adjacent components to maintain precise axial positioning, distribute centrifugal and thermal stresses evenly across the wheel structure, and prevent axial displacement during operation. This component ensures dimensional stability of the entire rotor assembly under extreme rotational speeds (typically 10,000-100,000 RPM) and temperature gradients exceeding 500°C in gas turbine applications.
Working Principle
The backface operates on mechanical support principles where it transfers axial loads from rotating blades through the wheel hub to stationary components via thrust bearings. During turbine operation, centrifugal forces create axial thrust components that must be counteracted by the backface's precisely machined surface. The component maintains rotor balance by providing a rigid reference plane for axial alignment, while its thermal expansion characteristics are engineered to match adjacent materials to prevent thermal stress concentrations.
Materials
High-temperature nickel-based superalloys (Inconel 718, Waspaloy) for gas turbines; Titanium alloys (Ti-6Al-4V) for aerospace applications; Martensitic stainless steels (17-4PH) for industrial turbines; Advanced ceramic matrix composites for next-generation high-temperature designs.
Technical Parameters
  • Hardness HRC 35-45 (steel alloys)
  • Surface Finish Ra 0.4-0.8 μm
  • Minimum Thickness 15% of wheel diameter
  • Flatness Tolerance 0.025 mm per 100 mm diameter
  • Maximum Operating Temperature 650°C (superalloys)
  • Thermal Expansion Coefficient 12-16 μm/m·°C
Standards
ISO 1940-1, ISO 11342, DIN ISO 1940, API 617

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Backface.

turbine backface rotor support surface axial load component turbine wheel structure high-temperature superalloy component rotor integrity surface turbomachinery structural part Backface Backface in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Turbine Wheel

A rotating component in a turbocharger that converts exhaust gas energy into mechanical rotation to drive the compressor wheel.

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Engineering Analysis

Risks & Mitigation
  • Thermal fatigue cracking
  • Creep deformation under sustained load
  • Stress corrosion cracking in corrosive environments
  • Axial displacement due to improper fit
  • Resonance-induced vibration amplification
FMEA Triads
Trigger: Thermal cycling exceeding material limits
Failure: Radial cracking propagating from bolt holes
Mitigation: Implement thermal barrier coatings and optimize cooling channel design
Trigger: Improper surface finish causing stress concentrations
Failure: Premature fatigue failure at fillet radii
Mitigation: Maintain Ra < 0.8 μm surface finish with controlled transition radii
Trigger: Material mismatch in thermal expansion coefficients
Failure: Warpage and loss of axial alignment
Mitigation: Select materials with matched thermal expansion characteristics

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Axial runout < 0.05 mm, perpendicularity < 0.02 mm/100 mm
Test Method
Laser alignment verification, coordinate measuring machine (CMM) inspection, ultrasonic thickness testing, dye penetrant examination per ASTM E1417

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What is the primary function of a turbine wheel backface?

The backface provides critical axial support to maintain rotor positioning, distributes centrifugal loads evenly, and prevents axial displacement during high-speed rotation.

Why are superalloys commonly used for backface components?

Nickel-based superalloys maintain structural integrity at temperatures exceeding 650°C while resisting creep deformation and thermal fatigue under cyclic loading conditions.

How does backface design affect turbine efficiency?

Proper backface geometry minimizes axial clearances, reduces parasitic losses from gas leakage, and maintains optimal blade tip clearances throughout thermal cycles.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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