Diamond blades and carbide blades are two widely used tools in the field of cutting and processing. They have significant differences in material composition, performance characteristics, and applicable scenarios. The following is a detailed comparison of the differences between the two from multiple dimensions:
1. Differences in material composition
Diamond blades:
The main cutting edge material is artificial diamond (PCD, polycrystalline diamond) or natural diamond, fixed by a binder (such as a carbide matrix). Diamond is the hardest substance in nature (Mohs hardness 10), composed of carbon elements, and has extremely strong wear resistance.
Carbide blades:
It is sintered by a powder metallurgy process with refractory metal carbides (such as tungsten carbide WC, titanium carbide TiC, etc.) and a binder (usually cobalt Co). Its hardness is lower than that of diamond (Mohs hardness 8-9), but its toughness and impact resistance are better.
| Performance index | Diamond blade | Carbide blade |
| Hardness | Hardness Extremely high (HV 8000-10000), top wear resistance | High (HV 1500-2000), medium wear resistance |
| Toughness | Poor, weak impact resistance, easy to break | Good, can withstand certain impact and vibration |
| Heat resistance | Poor, easy to carburize and fail at high temperature (＞700℃) | Good, can withstand high temperature of 800-1000℃ |
| Chemical stability | Easy to produce chemical reaction with iron metals (steel, cast iron, etc.) | Good chemical stability for most metals, especially suitable for processing ferrous metals |
| Friction coefficient | Low, not easy to stick to the knife during cutting, high surface finish | High, easy to produce built-up edge during high-speed cutting, affecting surface quality |
3. Applicable processing scenarios
Processing materials of diamond blades: suitable for cutting non-ferrous metals and non-metallic materials, such as aluminum alloys, copper alloys, magnesium alloys, plastics, wood, ceramics, glass, composite materials, etc.
Reason: Its high hardness and low friction coefficient can ensure the smooth processing surface and will not react chemically with non-ferrous materials.
Processing requirements: Suitable for high-precision, high-surface quality finishing (such as mirror milling, high-finish turning), but not suitable for intermittent cutting or rough processing (easy to break the edge).
Processing materials of cemented carbide blades: Mainly used for cutting ferrous metals (steel, cast iron, stainless steel, etc.), and can also process some non-ferrous metals (such as high-temperature alloys).
Reason: Good heat resistance and toughness, can withstand high temperature and impact during ferrous metal processing, and chemical stability is suitable for iron group elements.
Processing requirements: Wide range of applications, from rough processing (such as removing a large amount of excess) to semi-finishing, can withstand intermittent cutting and high feed speed.
4. Comparison of limitations
Diamond blades cannot process iron metals such as steel (carbon reacts with iron to form carbides at high temperatures, causing accelerated blade wear); poor impact resistance, cannot be used to process impurities or intermittent surfaces in hard and brittle materials; high cost (the price of artificial diamond is several times that of cemented carbide).
Carbide blades have lower wear resistance than diamonds, and have a short life when processing high-hardness materials (such as ceramics); high-speed cutting is prone to built-up edge, affecting surface accuracy; limited hardness, low processing efficiency for superhard materials (such as gemstones, cemented carbide itself).
5. Cost and life
Cost: Diamond blades (especially PCD) are much more expensive than cemented carbide blades, and are usually used for high-value, high-precision workpiece processing to offset costs.
Life: In the processing of adapted materials, the life of diamond blades is 5-10 times or even higher than that of cemented carbide (such as when processing aluminum alloys); but in unsuitable scenarios, the life will be sharply shortened.
Whether to choose diamond blades or carbide blades depends on the processing materials, precision requirements, and cutting conditions:
1. Processing non-ferrous materials such as aluminum and plastics and requiring high precision → Diamond blades are preferred;
2. Processing ferrous metals such as steel and cast iron or requiring rough processing and intermittent cutting → Carbide blades are preferred.
The two are not substitutes, but complementary, and together cover the cutting needs from ordinary metals to superhard materials.
Keywoods:
Difference between diamond blades and carbide blades
Diamond blades vs carbide blades
Which is better, diamond blades or carbide blades
Long-tail keywords:
What materials are suitable for diamond blades to process
Application scenarios of carbide blades
Comparison of hardness between diamond blades and carbide blades
Diamond or carbide blades for processing aluminum alloys
Cost difference between carbide blades and diamond blades
Blade selection: diamond vs carbide
Related extended keywords:
Difference between PCD blades and carbide blades
Selection of high-hardness blades
Comparison of metal cutting blade types
