Core Technologies
Powerful step to the future gas turbine total service provider
Gas Turbine high temperature specialty company SUNG-IL TURBINE P&S

Thermal Barrier Coating Technology
[ Overview ]

Thermal Barrier Coating Technology

홈 Core Technologies Thermal Barrier Coating Technology Overview

What Is Thermal Barrier Coating (TBC)?

TBC is applied to aircraft, GT engine and other parts enduring high temperature. The coating consists of ceramic top coat with low thermal conductivity and bond coat that makes top coating more adhesive. By setting up adequate porosity on top coat, it develops low thermal conductivity and high deformation resistance, cooling the material surface down 100 ~ 170℃ from the flame temperature. This helps overcome the limitation of turbine components.

TBC Technology

TBC Thickness

TBC Thickness
CLASS – B CLASS – C Super B Super C
~ 0.40mm ~ 0.60mm ~ 1.00mm ~ 2.00mm

Customized coating

Air Plasma Spray(APS)/High Velocity Oxygen Fuel(HVOF)

Air Plasma Spray(APS)/High Velocity Oxygen Fuel(HVOF) 단면도
  • Air Plasma
    Spray(APS)
  • High Velocity
    Oxygen Fuel
    (HVOF)

Air Plasma Spray(APS)/Air Plasma Spray(APS)

Air Plasma Spray(APS)/Air Plasma Spray(APS) 단면도
  • Air Plasma
    Spray(APS)
  • Air Plasma
    Spray(APS)

TBC Process

01Product Analysis and Coating Method Development

  1. 1Understands the usage pattern and characteristic of product
  2. 2Chooses TBC method to enhance product durability
  3. 3Conducts TBC reliability test in accordance with certain coating condition
  4. 4Develops TBC guidelines

02Product Coating

  1. Cleaning and
    pre-treatment
  2. Grit blast for illumination
    development
  3. Gun or pre-heating
    of oven
  4. Bond Coating
  5. Top Coating

03Final Inspection

  1. 1Carries out visual inspection if there is any pore, crack, detachment, burr, etc.
  2. 2Measures coating thickness using micrometer or film gauge.
  3. 3Conducts TBC reliability test according to coating condition.
  4. 4Checks sizes using vernier calipers, CMM equipment, etc.

Application of TBC

E-level

  • Model Name : W501D5, GT11NM
  • Turbine entrance temperature : 1100 ℃
  • Coating SPEC : Class B, Class C
  • Product Application :GT combustor and turbine parts

F-level

  • Model Name : GT24AB, 7FA/7FA+e
  • Turbine entrance temperature : Higher than 1350 ℃
  • Coating SPEC : Higher than Class B, Super B
  • Product Application : Gas turbine combustor and turbine component

G-level

  • Model Name : M501G
  • Turbine entrance temperature : Higher than 1500 ℃
  • Coating SPEC : Higher than Super
  • Product Application : Gas turbine combustor and turbine component

Types of TBC : Atmospheric Plasma Coating (APS)

Description

Between electrode (anode, or positive pole) and nozzle (cathode, or negative pole), high-frequency arc is generated. And the gas flowing between electrode and nozzle gets ionized to develop several-centimeter thick plasma plume with temperature reaching 16,000 degrees Fahrenheit. Meantime, powder is injected into the plasma plume from the outside of gun nozzle and melted there and then quickly sprayed onto the product surface by the pressure of gas to form coating layer.

대기플라즈마코팅 장면
대기플라즈마코팅 도식화
  • TBC Coating(2mm)
  • CoNiCrAlY Coating
  • NiCrAlY Coating
Product size Inner Diameter Coating I.D = Min. Ö 280mm / L = Max. 2,000mm
Outer Diameter Coating O.D = Max. Ö 2,500mm / L=Max. 4,000mm
Applied coating material Cr3C2-NiCr, MCrAlY, ZrO2-Y2O3, Low K

Types of TBC : HVOF (High Velocity Oxygen Fuel) Spray Coating

Description

As the mixture of gaseous fuel or liquid fuel and oxygen enters combustion chamber, it ignites consecutively. The ignition is further accelerated when powder moves into the flame. While the hot gas and powdered flame are sprayed onto the product surface, this power melts within the flame to coat the material surface.

초코속용사코팅 장면
초코속용사코팅 도식화
  • CoNiCrAlY - HVOF
  • CoNiCrAlY - APS
Product size Inner Diameter Coating I.D = Min. Ö 280mm / L=Max. 1,200mm
Outer Diameter Coating O.D = Max Ö 3,000mm / L=Max. 4,000mm
Applied coating material Cr3C2-NiCr, MCrAlY