ISO 14188:2012

Name: ISO 14188:2012 — Metallic and other inorganic coatings — Test methods for measuring thermal cycle resistance and thermal shock resistance for thermal barrier coatings
SKU: ISO 14188:2012
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Metallic and other inorganic coatings — Test methods for measuring thermal cycle resistance and thermal shock resistance for thermal barrier coatings

Название (английский):

ISO 14188:2012

Metallic and other inorganic coatings — Test methods for measuring thermal cycle resistance and thermal shock resistance for thermal barrier coatings

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 15
Дата публикации:: 10 октября 2012 г.
Издание:: ISO IS 14188 edition 1 version 1
ICS:: 25.220.20

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Описание (английский):

ISO 14188:2012 specifies test methods applicable to thermal barrier coatings for measuring thermal cycle resistance by using steady cyclical heating and cooling procedures, and for measuring thermal shock resistance using a heating and quenching technique. These measurements are used for the evaluation of durability of thermal barrier coatings to thermal strain. ISO 14188:2012 is applicable for screening thermal barrier coating systems including materials and processing, and not for controlling the thermal spraying processes.

Abstract

Похожие стандарты

Упомянутые в описании и другие стандарты ISO

Overview

ISO 14188:2012 - Metallic and other inorganic coatings - specifies laboratory test methods for measuring thermal cycle resistance and thermal shock resistance of thermal barrier coatings (TBCs). The standard defines steady cyclical heating/cooling procedures to evaluate resistance to thermal strain (spalling) and a heating‑and‑quenching technique to measure loss of tensile adhesive strength after thermal shock. ISO 14188:2012 is intended for screening TBC systems (materials and processing) and is not for control of thermal spraying processes.

Key topics and technical requirements

Test methods

Thermal cycle resistance: alternate exposure to high‑ and low‑temperature baths (steady cyclical heating/cooling) and measurement of spalling area versus number of cycles.
Thermal shock resistance: furnace heating followed by water quench; measurement of tensile adhesive strength degradation.

Acceptance / failure criteria

Critical number of cycles to spalling: number of cycles immediately prior to reaching a 30% ratio of spalling area of the TBC.
Thermal shock resistance: temperature difference that causes a 30% reduction in tensile adhesive strength relative to the unshocked condition.

Apparatus and control

High‑ and low‑temperature baths or furnace plus cooling water bath; thermocouples and temperature controllers for precise control.
Permissible temperature deviations: room to ≤600 °C ±3 °C; >600 to ≤800 °C ±4 °C; >800 to ≤1 000 °C ±5 °C; >1 000 °C ±7 °C.

Test pieces

Flat plate or disk geometries (examples include flat plates 20–100 mm long, 20–50 mm wide, 1.5–12.7 mm thick; disks 20–40 mm diameter, 1.5–5.0 mm thick).

Measurements and reporting

Visual and photographic records of spalling and cracking; image analysis to determine spalling area.
Cross‑sectional microstructural examination and photographic records.
Use of three or more specimens per condition to determine critical cycle counts.

Applications

Screening and comparative evaluation of thermal barrier coatings used on hot‑section parts (blades, vanes, combustors) in gas turbines and aero‑engines.

Assessing TBC durability against thermal cycling, shock events (e.g., emergency shutdown), and TGO (thermally grown oxide) effects.

Supporting materials selection, process development, failure analysis, and lifetime estimation for coated high‑temperature components.

Related standards

ISO 14232 - Thermal spraying - Powders (composition and supply)

ISO 14916 - Thermal spraying - Determination of tensile adhesive strength

Keywords: ISO 14188:2012, thermal barrier coatings, TBC, thermal cycle resistance, thermal shock resistance, spalling, tensile adhesive strength, thermally grown oxide, TBC testing.

ISO 14188:2012

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications

Who should use this standard

Related standards

Технические детали

BS EN ISO 14232-1:2017

Thermal spraying. Powders. Characterization and technical supply conditions.

BS EN ISO 14916:2017

ENISO 14916 Thermal spraying -- Determination of tensile adhesive strength.

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