Machining Examples

Composite Materials – Custom Machined Parts

Top Seiko has extensive experience in precision machining of Metal Matrix Composites (MMCs) based on Silicon – Silicon Carbide. MMCs are available in large sizes and can be more cost-effective than silicon carbide.
We also handle precision machining of Ceramic Matrix Composites (CMCs). Due to non-disclosure requirements, we cannot introduce further information.

Property Comparison Table of Composite Materials

Property
(Unit)
Composition Content Rate
(vol%)
Vickers Hardness
(GPa)
Flexural Strength
(GPa)
Fracture Toughness
(MPam¹/²)
Max Use Temperature
(℃)
Coefficient of Thermal Expansion
(×10-⁶/℃)
Thermal Conductivity
(W/(m・K))
Volume Resistivity
(μΩ・㎝)
Material
SS501 SiC
Si
50
50
- 300 3 1,200
(for reference only)
2.8
(RT~200℃)
2×10-2
SS701 SiC
Si
70
30
- 300 3 1,200
(for reference only)
3.0
(RT~200℃)
190 2×10-2
PARUCOCERAM SI SiC
Si
82
18
- 250 3 1,350
(for reference only)
3.4
(RT~700℃)
220 10-1
(for reference only)
SA701 SiC
Al
70
30
- 340 8 - 7.0
(RT~200℃)
160 10-5
High Purity Sintered SiC SiC 99 24 500 3 - 2.9
(RT)
150 >10⁶

Composite Materials – Key Properties & Popular Applications

Key Properties Applications
Available in Large Size MMCs are available in larger sizes than silicon carbide. ■Machinery components
■Jigs / fixtures
■Parts requiring minimum strength-to-weight ratios
■Parts subject to high temperatures or heavy loads
■Precision & intricate parts
■Heat transfer components
■Heat sinks & heat spreaders
■Vacuum equipment parts
■Parts requiring fine surface finishing by polishing
■Cost-effective alternative to silicon carbide
Good Machinability Due to their good machinability, MMCs are easier to produce intricate and high precision parts than SiC.
This makes MMCs popular materials to replace SiC and conventional materials in many applications where stiffness and strength as well as weight reduction are needed.
Our extensive experience in precision machining of MMCs enables us to optimize machining conditions to provide our customers the best quality parts at the lowest possible prices.
High- Temperature Capability MMCs can retain high strength at elevated temperatures.
Low Thermal Expansion MMCs have low thermal expansion, and can maintain
Warp- & Distortion -Proof dimensional stability when subjected to varying temperature conditions. And other structural applications.
High Thermal Conductivity Due to their excellent heat-conducting property, MMCs can effectively transfer (dissipate) heat.
Less Material Defect MMCs which we handle are produced by metal (E.g. Si) impregnation method which enables low defect rate.

Available Sizes and Machining Capability

Availability Sizes(mm) Machining Capability Sizes(mm)
Plate 600×800 Hole diameter Φ0.05~
Rod Φ50×400 Hole depth ~300
Groove width 0.05 or more Max. hole number 1,000
Max. Groove(pocket) depth 50 Thread size M2 or more

Composite Materials – Custom Machined Parts