Thermal spraying powder testing method

Thermal Spraying Powder Testing Method for Global Coating Supply Chains

As an ISO/IEC 17025 accredited laboratory, we deliver a comprehensive thermal spraying powder testing method covering chemical composition, particle size distribution, flowability, apparent density, and coating performance validation. Our thermal spraying powder testing method supports manufacturers and exporters of metallic, ceramic, and cermet powders used in HVOF, plasma, flame, and arc spraying processes, ensuring compliance with ASTM, ISO, EN, and AMS specifications across Europe, North America, and Asia. Every test is performed under our CNAS-accredited quality system, producing reports accepted by aerospace primes, power generation OEMs, and global surface engineering authorities.

Product Samples We Regularly Test Under Our Thermal Spraying Powder Testing Method

Metallic and alloy powders — NiCr, NiAl, MCrAlY, and CuNiIn for bond coats and dimensional restoration
Carbide and cermet powders — WC-Co, WC-CoCr, Cr3C2-NiCr, and TiC-based powders for wear and corrosion resistance
Ceramic oxide powders — Al2O3, TiO2, Cr2O3, ZrO2, and their blends for thermal barrier and dielectric coatings
Self-fluxing alloy powders — NiCrBSi and CoCrW alloys for hardfacing and valve components
Abradable and clearance control powders — AlSi-graphite, NiCrAl-bentonite composites for gas turbine seals
Feedstock powders for additive and cold spray — fine spherical titanium, aluminum, and copper powders

Chemical Composition Analysis in Thermal Spraying Powder Testing

Optical emission spectrometry and inert gas fusion for alloy chemistry — per ASTM E1019 and ISO 14284, the major alloying elements of metallic powders are quantified and oxygen/nitrogen levels measured by inert gas fusion to verify grade conformance and detect excessive oxidation that degrades coating quality.
X-ray fluorescence for ceramic and carbide powder composition — per ASTM E1621, the elemental oxide content in ceramic powders and the metallic binder fraction in cermets are precisely determined without destructive digestion.
Carbon and sulfur determination by combustion — per ASTM E1019, the total carbon and sulfur in carbide and self-fluxing alloy powders are measured to confirm the stoichiometry of WC and the level of free carbon or graphite additions.
X-ray diffraction for phase identification — per ASTM D3720, the crystalline phases present in the powder are identified to verify the absence of unwanted phases such as eta-phase in WC-Co or monoclinic ZrO2 in TBC feedstock.
Trace element and impurity screening — ICP-OES per ASTM E3061 quantifies tramp elements that affect sprayability and coating performance.

Particle Size and Morphology Characterization in Thermal Spraying Powder Testing

Laser diffraction particle size distribution — per ISO 13320 and ASTM B822, the D10, D50, and D90 values are reported from wet or dry dispersion, ensuring the powder cut falls within the specified range for the spraying gun type.
Sieve analysis for coarser fractions — per ASTM B214 and ISO 4497, the +45 μm and +53 μm oversize fractions are quantified by mechanical or air-jet sieving to prevent nozzle clogging and spitting during spraying.
Scanning electron microscopy for particle shape and surface morphology — high-magnification SEM imaging assesses sphericity, surface smoothness, satellite content, and internal porosity through cross-sectioned particles per ASTM F1877.
Particle density by helium pycnometry — per ASTM B923, the skeletal density is measured to detect internal porosity or hollow particles that cause in-flight melting inconsistencies.
Specific surface area by BET nitrogen adsorption — per ASTM C1274, applied to fine ceramic and cermet powders to predict dispersion and drying behavior in suspension-based spraying processes.

Flowability, Apparent Density, and Feedstock Handleability Testing

Hall flow rate measurement — per ASTM B213 and ISO 4490, the time for 50 g of powder to flow through a calibrated Hall funnel is recorded, providing the primary flowability metric for powder feed consistency in thermal spray guns.
Carney flow rate for fine and cohesive powders — per ASTM B964, the flow rate through a smaller orifice is measured for powders that do not flow freely through the standard Hall funnel.
Apparent density by Hall and Carney methods — per ASTM B212 and ASTM B417, the freely poured density is determined to verify powder lot consistency and predict feed behavior in volumetric powder feeders.
Tap density and Hausner ratio — per ASTM B527, the tapped density is measured after a defined number of taps, and the Hausner ratio calculated to quantify interparticle friction and powder cohesion.
Angle of repose and avalanche behavior — per ASTM D6393 and rotating drum analysis, the dynamic flow characteristics under low stress simulate the conditions inside a powder hopper.