Two Different Diamond Attachment Technologies
The key difference between vacuum brazed and sintered diamond blades lies in how the diamond crystals are bonded to the blade body. This difference dramatically affects cutting performance, blade life, and suitable applications.
Sintered Diamond Blades
How Sintering Works
In sintered blades, diamond crystals are mixed with metal powders (typically cobalt, bronze, or nickel) and pressed into a mold. The mixture is heated under pressure until the metal particles fuse together, creating a solid "cake" of metal bond with diamond distributed throughout.
Key Characteristics
- Bond type: Metal matrix (powder metallurgy)
- Diamond exposure: Controlled by bond wear rate
- Cutting action: Bond wears to expose new diamonds gradually
- Re-sharpening: Can be dressed to expose fresh diamonds
Vacuum Brazed Diamond Blades
How Vacuum Brazing Works
In vacuum brazed blades, diamond crystals are positioned on the blade surface and bonded using a special brazing alloy in a vacuum furnace. The brazing material forms a chemical bond (metallurgical bond) with both the diamond and the blade body, holding each diamond crystal with 70-80% of its surface exposed.
Key Characteristics
- Bond type: Chemical/metallurgical braze
- Diamond exposure: 70-80% of each crystal is exposed
- Cutting action: Immediate, aggressive cutting from first use
- Single-layer: Diamonds are on the surface only — no depth
Performance Comparison
| Factor | Sintered | Vacuum Brazed |
|---|---|---|
| Initial cutting speed | Moderate (builds up) | Very fast (immediate) |
| Diamond exposure | Gradual (bond must wear) | Maximum (70-80%) |
| Blade life | Longer (multi-layer) | Shorter (single layer) |
| Cost per cut | Lower for long runs | Higher but faster |
| Best materials | Concrete, stone, tile | Metal, fiberglass, rubber, plastic |
| Heat sensitivity | Can overheat | Runs cooler |
When to Choose Vacuum Brazed
Vacuum brazed blades excel at:
- Cutting metal (steel, cast iron, rebar)
- Fiberglass and composite materials
- Plastic and PVC pipe
- Rubber and gasket materials
- Emergency rescue cutting
- Applications requiring fast, aggressive cutting
When to Choose Sintered
Sintered blades are better for:
- Heavy concrete cutting
- Stone and masonry work
- Long-duration cutting jobs
- Applications where blade life is more important than speed
Conclusion: Different Technologies for Different Jobs
Vacuum brazed blades offer maximum cutting aggression and speed on metal and specialty materials. Sintered blades provide longer life and economy for concrete and stone. Many professionals keep both types in their toolkit.
At JKINGS Tools, we manufacture both vacuum brazed and sintered diamond blades for every application. Contact us for blade technology recommendations.
