Mix the powder
Metal powder and small process additives are blended so every press stroke starts with the same feed.
Manufacturing Technology
Powder Metallurgy Technology
See how powder becomes a finished PM part, which steps control size and strength, and where secondary operations are added.
Quick Answer
How does the powder metallurgy process work?
In simple terms, PM starts with metal powder, presses it into shape, heats it to bond the particles, and then adds finishing steps only where the drawing or function demands them. This page answers the process questions buyers and engineers usually ask before tooling is released.
Key Points
- The main process advantage is near-net-shape production with much less waste than subtractive machining.
- Secondary operations such as sizing, machining, heat treatment, or impregnation are added only where function requires them.
- Process selection should be based on part geometry, density target, tolerance, and annual demand.
Related Pages
The Process in Plain Language
Most sourcing teams do not need furnace chemistry first. They need a quick view of what happens, why it matters, and where cost or tolerance changes are introduced.
That is the goal of this section. Start with the simple flow, then move into the deeper process notes only if your part needs them.
Press the shape
Tooling compacts the powder into a green part that already looks close to the final geometry.
Sinter for strength
Heat bonds the particles and turns the green part into a usable metal component.
Finish only where needed
Sizing, machining, heat treatment, and inspection are added when function or tolerance requires them.
Why do buyers care about the process flow?
Because cost, tolerance, and lead time change at each step. A part that needs sizing, machining, and heat treatment will not behave like a simple as-sintered part.
Where do most PM projects succeed?
They succeed when the shape fits compaction, annual demand is high enough for tooling, and secondary work is kept to the features that truly need it.
Where do projects get expensive?
They get expensive when the design forces too many secondary operations or asks PM to do what another process does better.
Manufacturing Process Flow
Step 01
Powder Mixing
Step 02
Compacting
Step 03
Sintering
Step 04
Sizing
Step 05
Machining
Step 06
Quality Inspection
Powder Compacting
Powder Compaction
Compacting metal powder in precision tooling under high pressure to form green compacts with the target geometry and density.
Equipment
36 presses from 6T to 400T
Pressure
400-800 MPa
Capacity
9 million parts per month
Green Density
75-85% theoretical density
Complex multi-level shapes
Uniform density distribution control
Automated powder feed system
In-line quality monitoring
Powder Compacting Process
Sintering
Controlled Atmosphere Sintering
Heating green compacts to high temperature in a protective atmosphere to form metallurgical bonds and deliver the required strength, density, and hardness.
Furnaces
4 mesh-belt sintering lines
Temperature
1120-1300 deg C
Atmosphere
Hydrogen / Nitrogen / Dissociated ammonia
Capacity
220 tons per month
Precise temperature profile control
Real-time atmosphere monitoring
Continuous high-volume production
Energy-efficient furnace design
Sintering Process
Sizing
Sizing & Coining
Re-pressing sintered parts in precision tooling to improve dimensional accuracy, density consistency, and surface finish.
Equipment
15T-100T sizing presses
Precision
IT6-7 grade
Tolerance
+/-0.01 mm
Improvement
Density increase of 5-10%
Improved dimensional accuracy
Improved surface finish
Higher local density
Geometric shape correction
Sizing Process
Machining
Secondary Machining
Precision CNC operations for critical holes, threads, faces, and other features that require tighter tolerances or special geometry.
Equipment
CNC machining centers and CNC lathes
Precision
+/-0.005 mm
Operations
Drilling, milling, tapping
Automation
Auto loading and unloading
Precision hole machining
Thread creation
Complex external profiles
Assembly-critical features
Machining Process
Heat Treatment
Quenching, Tempering & Carburizing
Improving hardness, wear resistance, and strength through quenching, tempering, carburizing, and carbonitriding processes.
Methods
Quenching, tempering, carburizing, carbonitriding
Hardness
Up to HRC 60+
Furnaces
Controlled-atmosphere heat-treat furnaces
Capacity
High-volume continuous production
Higher surface hardness
Tougher core structure
Better wear resistance
Internal stress relief
Heat Treatment Process
Surface Treatment
Steam, Oil, Plating & Coatings
Steam treatment, oil impregnation, electroplating, and protective coatings improve corrosion resistance, airtightness, and functional performance.
Methods
Steam treatment, oil impregnation, electroplating, Dacromet
Corrosion
Salt spray resistance above 500 hours
Airtightness
Up to 10x improvement
Lubrication
Self-lubricating options available
Steam treatment for airtightness
Vacuum oil impregnation for self-lubrication
Electroplating for appearance and corrosion protection
Dacromet for environmentally compliant protection
Surface Treatment Process
Quality Control Equipment
The inspection lab checks size, material condition, and durability so production stays close to the drawing and control plan.
| Equipment Name | Model | Accuracy / Spec | Purpose |
|---|---|---|---|
| CMM (Coordinate Measuring Machine) | Hexagon Global | +/-1 um | Dimensional accuracy inspection |
| Gear Measuring Center | Klingelnberg P-series | 0.5 um | Tooth profile and lead inspection |
| Element Analyzer | Spectro MAXx | 0.001% | Material composition analysis |
| Density Tester | Mettler Toledo | 0.001 g/cm3 | Density and porosity testing |
| Ultrasonic Flaw Detector | Olympus | 0.5 mm sensitivity | Internal defect detection |
| Salt Spray Chamber | Q-FOG | ASTM B117 | Corrosion resistance testing |
1
Incoming Inspection
Powder composition, particle size distribution, and apparent density checks before production starts.
2
In-Process Control
Continuous verification of compaction density, key dimensions, and visible defects during production.
3
Final Inspection
Dimensional, functional, and appearance inspection based on the defined control plan and sampling level.
4
Shipping Inspection
Packaging, labeling, documentation, and traceability verification before shipment release.
GB9 Precision Gear Manufacturing
We use KISSsoft and dedicated measuring centers to manage shrinkage, tooth form, and inspection targets when a gear program needs tighter accuracy than a standard PM part.
KISSsoft gear design and simulation
Tooth profile modification and optimization
Gear meshing analysis and validation
Full inspection on dedicated gear measuring centers
Precision Comparison
GB9 Pitch Error<= 5 um
GB11 Pitch Error<= 10 um
Precision Improvement2x better
KISSsoft Gear Design
Related Resources
Use these internal links to keep moving through the most relevant guides, service pages, and technical references for this topic.
Powder Metallurgy Gears
See how GB9 gear work, KISSsoft design support, and process control fit into real PM gear programs.
Secondary Machining
Review when drilling, tapping, grinding, or CNC finishing is still required after sintering.
Surface Treatments
Compare steam treatment, oil impregnation, coatings, and corrosion-focused finishing options.
Quality Inspection
Learn how inspection plans, density checks, and traceability support stable export production.