Overview
The Vickers Hardness Test Indenter is a critical component in hardness testing machines, designed to evaluate material resistance to deformation. Developed in 1921 by Smith and Sandland at Vickers Ltd., it employs a geometrically standardized diamond pyramid to create indentations under precise loads. Unlike Rockwell testers, Vickers indenters are suitable for all materials, from soft metals to ultra-hard ceramics, due to their consistent 136° apex angle. The method’s independence from load magnitude (unlike Brinell) allows testing across wide thickness ranges, making it indispensable in laboratories and industrial quality control.
Structure and Working Principle
The indenter features a square-based pyramidal diamond tip bonded to a steel or tungsten carbide shank. The diamond’s exceptional hardness (10,000 HV) ensures minimal wear during repeated testing. Under ISO 6507 standards, the tip’s opposing faces meet at a precise 136° angle to yield geometrically similar indentations at any load. During testing, the indenter is pressed into the material for 10–15 seconds. The resulting impression’s diagonals are measured under a microscope, and hardness (HV) is calculated using the applied load and diagonal lengths. This optical measurement eliminates errors from elastic recovery, enhancing accuracy.
Key Features
1. **Universal Applicability**: Measures hardness across materials (0.3–3,000 HV) without changing tips. 2. **Microhardness Testing**: Enables testing on thin coatings or small areas with loads as low as 10 gf. 3. **Traceable Standards**: Complies with ISO 6507, ASTM E92, and JIS Z 2244 for global acceptance. Diamond tips are polished to nano-level smoothness (<0.1 µm roughness) to prevent measurement deviations. Advanced versions may include anti-reflective coatings for improved optical diagonal readings during automated testing.
Application Areas
**Metallurgy**: Evaluates heat treatment efficacy in aerospace alloys (e.g., titanium, Inconel). **Semiconductors**: Tests wafer hardness in chip manufacturing. **Automotive**: Verifies case-hardened gear surfaces. In research, it quantifies hardness gradients in welded joints or additive-manufactured layers. The microhardness variant (Knoop/Vickers) is vital for thin-film coatings like PVD or CVD layers in tooling industries.
Maintenance and Precautions
**Cleaning**: Use lint-free wipes and ethanol to remove contaminants; avoid ultrasonic cleaning for diamond tips. **Calibration**: Recalibrate every 6 months or per ISO 6507-3 using certified reference blocks. Misalignment or overloading can fracture the diamond tip. Store in protective cases with desiccants to prevent humidity damage. Regularly inspect for chips under 20x magnification.
B2B Procurement Guide
1. **Standards Compliance**: Prioritize ISO 6507-verified indenters with calibration certificates from NIST or PTB. 2. **Load Range**: Select tips rated for your tester’s maximum load (commonly 1–120 kgf). 3. **Supplier Audits**: Choose manufacturers with diamond-tip polishing expertise (e.g., Swiss or Japanese suppliers). Bulk orders (5+ units) often attract 10–15% discounts. For microhardness testing, specify tip radii <0.5 µm.
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