金属組織分析

Carbon fiber composites combine lightweight design with high mechanical performance, but their heterogeneous structure makes metallographic preparation particularly challenging. During sectioning and polishing, fiber pull-out, surface damage, scratches, and edge rounding can alter the fiber/matrix interface and affect the accuracy of subsequent microstructural analysis. For this sample, a controlled preparation route was used: • TJ2568 […]

For coated sapphire components used in optical and precision applications, metallographic cross-sectioning is often used to evaluate coating and ink-layer thickness, interface quality, and overall integrity. The challenge is preparation. Thin coatings can easily suffer from edge chipping, delamination, pull-off, or rounding during cutting and polishing, making the final cross-section difficult to measure accurately. For […]

Cracking, delamination, or brittle fracture during stamping and bending of SPCC cold-rolled steel may not always be explained by dimensions or conventional tensile properties. Cross-sectional metallography can reveal what routine inspection may miss — such as coarse grains, excessive banding, carbide aggregation, or rolling-induced microcracks that can reduce formability and contribute to unexpected failures. For […]

High‑power conductive copper busbars and integrated shunt resistors commonly adopt a dual‑layer electroplating structure: 1.5‑4μm nickel underlayer + 3‑8μm tin top layer, balancing corrosion resistance and electrical assembly requirements. Acting as a barrier layer, the dense nickel underlayer blocks outward diffusion and oxidation of copper substrate ions. It improves plating adhesion, enhances wear‑resistant and high‑temperature‑resistant […]

Mo-W alloys combine the superior properties of two refractory metals, featuring ultra-high melting points and excellent dimensional stability at elevated temperatures, widely adopted for high-temperature structural applications. Different from most hard alloys, Mo-W alloys are relatively softer with better ductility — a characteristic that creates challenges for metallographic sample preparation. When processed on a countertop […]

Alumina ceramics possess outstanding properties including high hardness, superior wear resistance, corrosion resistance and excellent insulation. As widely used structural and functional ceramics, they are applied in electronic insulation parts, precision wear-resistant components, high-temperature shielding, aerospace and metallurgy. Their microstructure directly governs the service performance and lifespan of finished products. Metallographic examination allows clear observation […]

The cross-sectional morphology of nylon and PET fibers holds critical clues to material performance. Metallographic analysis reveals distinct fiber cross-section geometries—standard circular, custom cross-shaped, hollow or trilobal profiles. These microstructures directly govern fiber luster, hand feel, moisture absorption and mechanical strength. For instance, hollow cross-sections deliver lightweight warmth, while profiled shapes improve moisture wicking. Engineers […]

The Han Dynasty marked the golden age of ancient Chinese bronze mirror craftsmanship. Mirrors were predominantly cast from a ternary alloy of lead, tin and copper with a classic ratio roughly 14:5:1. Lead improves the fluidity of molten alloy, enabling sharply defined decorative patterns, stable forming and mass production — a remarkable achievement of Han […]

WC-10Co4Cr is the ideal protective cermet for HVOF/HVAF thermal spraying, outperforming traditional hard chrome and ordinary tungsten carbide against wear, salt spray and acid-alkali erosion.   Key advantages:   • Hardness up to HRC 67-70 with outstanding wear resistance • Chromium formula delivers superior anti-corrosion performance • Dense coating with high bonding strength, works under […]

Bronze mirrors of the Han Dynasty mark the pinnacle of ancient Chinese mirror casting craftsmanship, evolving through three distinct phases: Early & mid-Western Han inherited techniques from the Warring States Period before forming a unique minimalist aesthetic. From the late Western Han to the Wang Mang reign, geometric TLV pattern mirrors and blessing inscriptions became […]

High-strength fasteners adopt an integrated manufacturing process: quenching & tempering base treatment plus nitriding surface strengthening. Low-temperature nitriding forms a dense white nitrided layer on thread surfaces with minimal heat treatment distortion, fully securing dimensional precision of threads. Metallographic testing acts as a core quality control measure across the entire fastener production workflow. It enables […]

After forging, raw steel features a ferrite-pearlite matrix. Quenching and high-temperature tempering produce fine, uniform tempered sorbite, striking a perfect balance of core strength and toughness. Low-temperature nitriding forms a dense white nitride compound layer on thread surfaces with negligible heat distortion, locking in precise thread tolerance. Metallographic testing is our core quality control checkpoint: […]

Electromagnetic shielding coatings serve as core protective materials for 5G communications, precision electronics and new energy equipment. Featuring ultra-thin profiles, superior shielding efficiency and wide compatibility, they effectively block electromagnetic interference and prevent signal leakage, enabling stable operation of electronics under complex electromagnetic environments. They are now the mainstream lightweight electromagnetic shielding solution. Metallographic sectioning […]

Metallographic examination of carbon steel weld joints fabricated via CO₂ gas metal arc welding serves as the core method to assess welding quality and process rationality. Columnar grains, along with small amounts of proeutectoid ferrite, side-plate ferrite and pearlite are generally found in the weld metal zone. The heat-affected zone (HAZ) exhibits microstructural transitions between […]

Ultra-small gold-plated stainless steel tubes (4mm × 0.55mm) combine the high strength, wear resistance and excellent air tightness of stainless steel with the low impedance, oxidation resistance and good solderability of gold plating. Widely used in precision electronics, optical communication, medical devices and RF connectors, these micro components serve for precision signal transmission and micro-sealing […]

ENEPIG (Electroless Nickel-Palladium-Gold) stands as a dominant surface finish for high-performance PCBs. Built with compact, uniform Ni-Pd-Au triple-layer coating, it features superb oxidation & corrosion resistance plus low contact resistance. It eliminates black pad issues from conventional immersion gold while supporting both soldering and wire bonding for complex electronic assembly. Key Applications ✅ Semiconductor packaging […]

GH4169 nickel-based superalloy is widely applied in hot-section components of aero-engines, as well as high-temperature load-bearing structural parts for aerospace and energy industries. Metallographic inspection plays a vital role. It visually evaluates grain size, gamma prime precipitation and harmful phase distribution, closely correlating with material strength, creep and fatigue properties. Strict specimen preparation is required. […]

Beneath the sharp edges of traditionally forged knives lie hidden changes in metallographic structures. With proper specimen preparation and microscopic inspection, we can fully figure out the merits and flaws of classic forging techniques. Metallographic views show obvious slag inclusions from embedded scale layers and high-temperature induced decarburization zones at folded forging joints. These parts […]