Custom ceramic manufacturing
Custom Silicon Nitride Ceramic Parts Manufacturer
The structural ceramic. Chosen when the part has to carry load, resist fatigue and survive thermal cycling without the brittleness of silicon carbide.
- Drawing-based customization — every part produced to your drawing, not stock
- Prototype-to-production — one-off evaluation parts through repeat production
- Precision machining & inspection — diamond grinding and documented verification
What we manufacture
Custom Silicon Nitride Components We Manufacture
Precision silicon nitride components manufactured to customer drawings, with geometry and critical features evaluated against application requirements.
Silicon Nitride Tubes & Rings
Tubes and rings for thermal cycling and structural service.
- Bore and face geometry to the drawing
- Keeps strength at temperature
Structural Spacers & Load-Bearing Parts
Spacers and load-bearing parts from your drawing.
- Compound datums held
- Surface integrity controlled
Rolling Elements & Wear Rings
Balls, rollers and wear rings for high-load service.
- Ground rolling surfaces
- Wear surfaces to the drawing
High-Temperature Supports
Supports and fixtures that carry load at temperature.
- Feature-specific geometry review
- Material confirmed in writing
Lightweight Structural Components
Stiff, low-density structural parts from your drawing.
- Non-standard geometry
- One-off to production quantities
Bearing & Wear Components
Bearing elements and wear components for machinery.
- Tolerance held to the drawing
- Finish specified on load surfaces
Engineering problems we help solve
Engineering Challenges Addressed with Custom Silicon Nitride
| Property | Engineering benefit | Relevant application condition |
|---|---|---|
| Flexural strength above 600 MPa with toughness above 6 MPa√m | Carries load and survives impact | Structural components under cyclic load |
| Thermal shock resistance around ΔT 500 °C | Survives rapid thermal cycling | Parts cycled between hot and cold |
| Density above 3.2 g/cm³ | High stiffness with low moving mass | Rolling elements and accelerating parts |
How it works
From Your Drawing to Finished Silicon Nitride Components
You submit the drawing. We evaluate manufacturability. The component is made and inspected to the agreed specification.
Precision & inspection
Precision Machining and Inspection for Silicon Nitride Parts
Confirmed capability figures
The figures below are this shop’s confirmed manufacturing capability, quoted in this material’s context. They are feature-specific capability references, not blanket tolerances for every material or geometry.
These values are feature-specific capability references, not blanket tolerances for every material or geometry. Achievability depends on material, part size, wall thickness, feature geometry, datum scheme and finishing process. Final capability is confirmed during drawing review.
The machining route behind these figures is described under precision grinding, and the equipment that verifies them under inspection and metrology.
Engineering essentials
Silicon Nitride Grades & Engineering Essentials
Material Selection
Representative published values for material selection. Where a property governs the design, state it on the drawing so it is confirmed against the supplied batch.
Material properties are representative and grade-dependent. Final material selection should be confirmed against the specific grade and application conditions. The inspection certificate for the batch supplied is the governing document for a delivered order.
Typical values for sintered silicon nitride. Values vary between commercial grades; strength and toughness in particular depend on the sintering route and the grade supplied.
View Full Engineering PropertiesSilicon Nitride against Silicon Carbide
Strength in bending and heat removal separate the range faster than any other pair of properties. Each bar is the range published for that material family, taken from the same comparison table that appears in the selection centre.
Flexural strength, MPa — Silicon carbide (SiC): 400 · Silicon nitride (Si3N4): >600
A longer bar carries more load before it breaks. A range covers the grades supplied in that family rather than one nominal figure.
Source: Flexural strength (MPa)
Thermal conductivity, W/m·K — Silicon carbide (SiC): 100 · Silicon nitride (Si3N4): 15 – 20
A longer bar moves heat away faster. Conducting heat while still insulating electrically is the pairing power electronics needs, and it is why this property is read next to strength.
Source: Thermal conductivity (W/m·K)
What it is not good at
Stating this up front prevents a material being selected for the one thing it cannot do.
- Higher cost than alumina, and grinding is slow
- Surface finish and surface defects matter more than in non-structural ceramics, because cyclic load initiates cracks at defects
- Processing is less forgiving; the material grade and the route both affect the result
- Not the cheapest answer for a wear-only problem where alumina would suffice
Questions
Frequently Asked Questions About Custom Silicon Nitride Parts
When is silicon nitride better than silicon carbide?
When the part carries mechanical load or sees impact. Silicon carbide is harder and more thermally capable, but silicon nitride is tougher and therefore survives load and cycling better.
Does surface finish affect structural performance?
It does. Under cyclic load, machining defects behave as crack initiators, so the finish on load-bearing surfaces is a functional specification rather than a cosmetic one.
Is silicon nitride electrically insulating?
Yes, which is one of the reasons it is used where a structural part also has to isolate.
Request a quote
Request a Quote for Custom Silicon Nitride Ceramic Parts
Send the drawing, the material grade if it is fixed, the quantity, the critical dimensions and tolerances, the required surface finish and the operating environment. The material is confirmed in writing with the quotation.
Engineering reference
Engineering Reference Library
Complete material engineering detail, retained on this page. Open a group for the full reference.
Material Fundamentals & Selection
Material overview
What is silicon nitride ceramic?
Silicon nitride (Si3N4) is a compound of silicon and nitrogen sintered into a structural technical ceramic. Published typical values are a flexural strength above 600 MPa and a fracture toughness above 6 MPa√m, with a density above 3.2 g/cm³ and a thermal shock resistance around ΔT 500 °C; these figures vary between commercial grades. It is the structural ceramic of the range: specified for parts that carry load, take impact or cycle thermally. Shafts, pins, rollers, rings and structural spacers are the common product forms.
When to choose Silicon Nitride
Each row links a published property to the engineering benefit it buys and the condition where that benefit is the reason for the choice.
| Property | Engineering benefit | Relevant application condition |
|---|---|---|
| Flexural strength above 600 MPa with toughness above 6 MPa√m | Carries load and survives impact | Structural components under cyclic load |
| Thermal shock resistance around ΔT 500 °C | Survives rapid thermal cycling | Parts cycled between hot and cold |
| Density above 3.2 g/cm³ | High stiffness with low moving mass | Rolling elements and accelerating parts |
If your project looks like one of these
- Structural components under cyclic mechanical load
- Parts combining mechanical load with thermal movement
- Rolling and sliding elements in demanding machinery
- High-temperature parts that must also resist shock
- Components requiring stiffness with low mass
The comparison against the other structural ceramic is set out in the silicon carbide vs silicon nitride note. Applications driven by sliding contact are covered under wear and friction, and the route to finished tolerance in fired material under precision grinding.
Why engineers select it
Each of these is a reason to choose it. The limitations that follow are the reason not to.
- High strength with toughness well above alumina and silicon carbide, giving good fatigue and impact behaviour
- Thermal shock resistance well above alumina, combined with structural strength
- Good wear resistance in rolling and sliding contact
- Low density, which suits moving components
- Good electrical insulation in addition to its mechanical properties
Complete Silicon Nitride Property Table
| Property | Typical value |
|---|---|
| Colour | Grey-black |
| Density (g/cm³) | >3.2 |
| Rockwell hardness HRA | 90 |
| Vickers hardness HV0.5 | >1550 |
| Elastic modulus (GPa) | 290 |
| Flexural strength (MPa) | >600 |
| Compressive strength (MPa) | 2500 |
| Fracture toughness (MPa√m) | >6.0 |
| Maximum use temperature (°C) | 1200 |
| Thermal conductivity (W/m·K) | 15 – 20 |
| Thermal expansion coefficient (×10⁻⁶/K) | >3.1 |
| Thermal shock resistance (ΔT, °C) | 500 |
| Specific heat (J/kg·K) | 700 |
| Dielectric breakdown strength (kV/mm) | 1 |
| Volume resistivity, 20 °C (Ω·cm) | 1.0×1012 |
Material engineering reference: Silicon Nitride (Si3N4) for Custom Precision Components
Applications & Alternative Ceramics
Silicon Nitride in service
The sectors below are the ones that specify this material, with the component that carries the requirement and the material property that earns the place. Each entry opens the sector page for the full component list.
A sector that is not listed is not a sector that is refused. It means the material has not been the obvious answer there, and the review starts from the operating condition instead.
What to compare it against
These are the alternatives that most often come up against Silicon Nitride, with the reason each might be preferred.
What is produced in this material
What is produced in this material
Structural spacers and load-bearing parts
Rolling elements and wear rings
High-temperature supports under load
Tubes and rings in thermal cycling service
Lightweight structural components
Turbocharger rotor and rotor-type structural parts
Diesel and gas engine wear and valve components
Balls, rollers and bearing elements for high load
The shapes this material is ordered in
Silicon nitride is not bought from a stock shape list, so the form of the order is set by the part. Rings and seal rings are the most common, because the material holds a sealing face that also cycles in temperature; they are quoted under rings and seal rings. Shafts, pins and rollers follow from the same property, since rolling and sliding contact is where the toughness of the material is used, and they are grouped under shafts and pins. Parts that carry a bore, a flow path or a sliding fit come through as tubes and sleeves.
What separates two quotations for the same outline is usually the surface rather than the shape. Under cyclic load a machining defect behaves as a crack initiator, so the finish and the edge condition on load-bearing and sliding surfaces are functional callouts, and a drawing that leaves them open is priced with an assumption built in. Where the reason for the material is that a moving part has to stay light as well as stiff, the case is set out under lightweight structural components.
Manufacturing & Design Considerations
What the material costs in production
The material decision and the manufacturing route are the same decision seen from two ends. Green machining, diamond grinding, lapping and polishing each have a place, and the route depends on the geometry and the tolerance.
- Diamond grinding with parameters selected for a structural material rather than a generic ceramic
- Surface integrity is a functional requirement: a defect left by machining behaves as a crack initiator
- Edge quality is specified, since edges are where cracks begin under cycling load
- Green machining plus finish grinding is used for complex shapes
What to expect on the drawing
Tolerance and finish are specified per feature. An overall callout on the whole part is the most common cause of an unnecessarily expensive quotation.
Tolerance considerations
- Tolerances are reached by grinding fired material
- Its strength allows thinner load-bearing sections than alumina at the same load
- Reliability under cyclic load depends on surface condition as much as on dimension, so both are specified
Surface finish considerations
- Finish is specified on load-bearing and sliding surfaces
- A finer finish improves fatigue behaviour, so it is a functional callout rather than cosmetic
- Non-functional surfaces are left as-ground to control cost
Inspection & Technical Documentation
How critical features are verified
On a structural material, surface condition is a functional dimension, so inspection covers finish and edge quality alongside geometry.
- Load-bearing surfaces are inspected for finish and for machining defects that could act as crack initiators under cyclic load
- Roundness and profile of rollers and wear rings are measured on roundness equipment
- Datum geometry and position are measured on the CMM
- Edge condition on load-bearing edges is inspected at magnification and reported against the agreed criterion
The equipment behind these methods is listed on the inspection and metrology page.
Technical documents
No file on this page is offered as a download, because each document is generated against the grade and the drawing on the order. What can be issued, and when, is listed here instead.
| Document | Applies to | Format | Issued |
|---|---|---|---|
| Material grade certificate | The grade the part is produced from | With the shipment | |
| Dimensional inspection record | The dimensions called out on the drawing | With the shipment | |
| Certificate of conformity | The finished part, against the drawing | With the shipment | |
| First article inspection report | The first part produced to a new drawing | On request; method agreed at quotation | |
| Material property data for the selected grade | The grade in question | On request, or from the material manufacturer |
A document that is not on this list is not refused by default; it is quoted once the method behind it has been confirmed. State what your incoming inspection will check, and the document set is agreed before the order is placed.