HardMaterialsParts.com | Precision Machining of Sapphire, Ceramics & Hard Materials Since 1947

70+ Years of Excellence in Hard Material Machining

Since 1947, China Hard Materials Parts, Inc. has specialized in the precision machining and polishing of technical ceramics, sapphire, glass, and quartz. We serve industries where failure is not an option — from aerospace and defense to medical and semiconductor.

Our team of experienced engineers and machinists works closely with clients to solve complex material challenges, offering guidance on material selection, design optimization, and cost-effective manufacturing strategies.

• ITAR Compliant Manufacturing
• Class 100 Cleanroom Available
• Video Inspection & Full Documentation
• Prototypes to High-Volume Production

Advanced CNC machining center for ultra-precision ceramic components

Materials We Machine

We work with a wide range of ultra-hard and technical materials, each selected for its unique mechanical, thermal, optical, or electrical properties.

Sapphire

Optical-grade single-crystal sapphire with exceptional hardness, transparency, and thermal stability. Ideal for windows, sensors, and semiconductor components.

• Extreme scratch resistance (9 Mohs)
• UV to IR transparency
• High thermal conductivity

Alumina Ceramics

Available in 94%, 99.5%, and 99.9% purity. Offers excellent electrical insulation, wear resistance, and chemical stability.

• High compressive strength
• Low dielectric loss
• Biocompatible

Zirconia (TZP, PSZ)

Tetragonal Zirconia Polycrystal (TZP) and Partially Stabilized Zirconia offer superior fracture toughness and strength.

• Highest toughness among ceramics
• Low thermal conductivity
• Wear-resistant

Silicon Carbide

Available in CVD, Reaction Bonded, and Sintered forms. Exceptional thermal conductivity and rigidity.

• High hardness and stiffness
• Excellent thermal shock resistance
• Low thermal expansion

Tungsten Carbide

Extremely hard and wear-resistant. Used in high-stress mechanical and industrial applications.

• High density and strength
• Excellent abrasion resistance
• Good thermal conductivity

Fused Quartz / Silica

Ultra-pure glass with near-zero thermal expansion and high UV transparency.

• Low coefficient of thermal expansion
• High purity (SiO₂ > 99.9%)
• Excellent optical clarity

Aluminum Nitride

High thermal conductivity ceramic used in electronic substrates and heat sinks.

• Thermal conductivity up to 180 W/mK
• Electrically insulating
• Low dielectric constant

Boron Carbide

One of the hardest known materials, used in armor, nozzles, and nuclear applications.

• Third hardest material after diamond and cubic BN
• Neutron absorption capability
• High wear resistance

Zerodur® (Schott Glass)

Near-zero expansion glass-ceramic for precision optics and metrology.

• Ultra-low thermal expansion
• High homogeneity
• Excellent polishability

High-Precision Ceramic Components

From sapphire wafer carriers to precision gears and optical lenses, we deliver mission-critical parts with micron-level accuracy.

Sapphire Wafer Carriers

Used in semiconductor processing, these carriers withstand high temperatures and corrosive environments.

• Tolerance: ±0.0001"
• Material: Optical-grade sapphire
• Application: Wafer handling

Precision Optical Lenses

Spherical and aspherical lenses ground and polished to optical specifications in sapphire, quartz, and glass.

• Surface finish: λ/4
• Materials: Sapphire, Fused Quartz
• Radius grinding: internal & external

Piston & Sleeve Assemblies

High-precision ceramic assemblies for fluid handling in aggressive environments.

• Clearance: 0.0002" – 0.0005"
• Materials: Alumina, Zirconia
• Sealing without lubrication

Metalized Sapphire Windows

Hermetically sealed sapphire windows with metal coatings for RF and optical transmission.

• Hermetic sealing capability
• Coatings: Gold, Kovar, etc.
• Application: Aerospace sensors

Precision Zirconia Gears

YTZP zirconia gears for high-torque, non-conductive, and wear-resistant applications.

• Module: 0.1 – 0.5
• Material: 3Y-TZP
• No lubrication required

Silicon Carbide Components

High-stiffness, thermally stable parts for optical benches, mirrors, and semiconductor tools.

• CVD, Sintered, RB forms
• Flatness: λ/10
• Lightweight & rigid

Macor® Machined Parts

Precision-machined glass-ceramic components for electrical insulation and vacuum applications.

• Easy to machine
• UHV compatible
• CTB: 9.5 ppm/°C

Corning ULE® Components

Ultra-low expansion glass for metrology, astronomy, and precision instruments.

• Near-zero thermal expansion
• High homogeneity
• Optical polishing available

Our Capabilities

From prototype to high-volume production, we combine advanced technology with decades of expertise to deliver precision you can trust.

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5-Axis CNC Machining

Complex geometries with micron-level precision in hard materials.

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Robotic & Lights-Out Manufacturing

High-volume, consistent production with minimal human intervention.

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Video Inspection & Metrology

Full inspection with digital documentation and traceability.

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Class 100 Cleanroom

For contamination-sensitive medical and semiconductor applications.

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ITAR Compliant

Secure handling of defense and aerospace projects.

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Tolerances to Millionths of an Inch

Extreme precision in flatness, roundness, and dimensional control.

Frequently Asked Questions

What materials does China Hard Materials Parts® machine?

We machine sapphire, aluminas (94%, 99.5%, 99.9%), zirconias (TZP, PSZ), silicon carbide (CVD, sintered, RB), tungsten carbide, boron carbide, aluminum nitride, silicon, fused quartz, ULE®, Zerodur®, Macor®, and more.

Does China Hard Materials Parts® work on prototype quantities?

Yes, we specialize in low-volume prototype machining as well as high-volume production.

What tolerances can be held?

We routinely hold tolerances in the millionths of an inch for dimension, flatness, roundness, and cylindricity.

Can sapphire be cast or molded?

No, sapphire is a single-crystal material and must be grown as a boule, then cut and precision-machined to final shape.

Do you sell bulk ceramic or sapphire?

No, we are a precision machining and fabrication house. We do not sell raw materials in bulk.

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Precision Machining of Hard Materials