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Composite Materials

1.Abstract

More and more composite materials are widely used in our life as the production and the development of science and technology. Composite material is widely used in aerospace, automotive industry, manufacturing and medicine and other fields because it has thermal stability, high strength and stiffness, fatigue resistance performance and many other advantages. and the new requirement of technology and products of high demand, but the customer demands for high product and process understanding is different, so fracture, crack, blasting plate, corrosion failure occur frequently on layered composite material, which is often cause the responsibility of the dispute between supplier and user, so lead to a serious economic loss. At present, more and more enterprises and units have a comprehensive understanding for composite material failure analysis, try to find the root cause of product failure and its mechanism by means of failure analysis, then improve product quality, process improvement and responsibility of arbitration etc.

2.Service object

Composite materials manufacturers: in-depth product failure may cause the design, production, process, storage, transportation and so on stage, explore its failure mechanism, to improve product yield and provide basis for optimizing production processes.

Distributor or agent: In time for the incoming quality control effectively, provide the basis for product quality responsibility for justice defined.

Distributors or agents, to provide favorable evidence for the quality responsibility, the responsibility for justice.

The machine user: follow up and feedback suggestion to product process and reliability, improve product yield and core competitiveness.

3.Produce benefit

1).Failure analysis can timely make manufacturers and distributors understand the status of the products, and provide effective prevention policy failure of their products;

2).It can provide improving suggestions for product and process, improve product yield and as well as enhance product competitiveness;

3).It can clear confirm the responsible party of composite material failure and provide the basis for judicial arbitration.

4.Main failure mode (but not limited to)

Crack, corrosion and explosion plate delamination, open circuit (line, hole), such as color change failure.

PCB interface failure	FPC open circuit failure
Common cement open circuit failure

Common failure analysis technology

Nondestructive testing:

Ray fluoroscopy Three-dimensional CT examination C - SAM check

5.Common failure analysis technology

Material component analysis

Microscopic Fourier transform infrared spectrum analysis(FTIR)

Microscopic confocal Raman spectrometer(Raman)

Scanning electron microscopy and energy spectrum analysis(SEM/EDS)

X-ray fluorescence spectrum analysis(XRF)

Gas chromatography - mass spectrometry instrument(GC-MS)

Pyrolysis gas chromatography - mass spectrometry(PGC-MS)

Nuclear magnetic resonance analysis(NMR)

Auger electron energy spectrum analysis(AES)

X-ray photoelectron spectroscopy analysis(XPS)

X-ray diffractometer(XRD)

Time-of-flight secondary ion mass spectrometry(TOF-SIMS)

Material performance

The breakdown voltage, voltage resistance, dielectric constant, electric migration, etc

Destructive test:

Dyeing and penetration testing

Cross section analysis, metallographic cross section analysis, sample preparation of focused ion beam (FIB)  , sample preparation of ion milling (CP) .

Material physical properties testing:

The tensile strength, bending strength, etc

Failure emersion/verification