{"id":6508,"date":"2026-06-10T09:04:04","date_gmt":"2026-06-10T09:04:04","guid":{"rendered":"https:\/\/wiresawcutter.com\/?p=6508"},"modified":"2026-06-10T09:04:04","modified_gmt":"2026-06-10T09:04:04","slug":"aluminum-nitride-substrate","status":"publish","type":"post","link":"https:\/\/wiresawcutter.com\/ru\/blog\/aluminum-nitride-substrate\/","title":{"rendered":"\u0410\u043b\u044e\u043c\u0438\u043d\u0438\u0435\u0432\u044b\u0439 \u043d\u0438\u0442\u0440\u0438\u0434 (AlN). \u0421\u0443\u0431\u0441\u0442\u0440\u0430\u0442: \u0441\u0432\u043e\u0439\u0441\u0442\u0432\u0430 \u0438 \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u0435 \u0432 \u0441\u0438\u043b\u043e\u0432\u043e\u0439 \u044d\u043b\u0435\u043a\u0442\u0440\u043e\u043d\u0438\u043a\u0435"},"content":{"rendered":"
\n
\n

An aluminum nitride substrate is usually bought for thermal conductivity, electrical insulation, and dimensional stability. Cutting has to protect those values: low edge chipping, narrow kerf, controlled sub-surface damage, clean coolant handling, and enough process evidence for the next packaging or inspection step.<\/p>\n

Use this guide when an AlN sheet, wafer, carrier, or ceramic substrate needs slicing, couponing, dicing, or sample preparation before a high-power electronics, LED, RF, GaN, IGBT, or thermal package build. Some drawings call the same material aluminium nitride; the cutting risks stay the same.<\/p>\n<\/header>\n

\n

Quick Specs Card<\/h2>\n
\n
Common workpieces<\/strong>
\n0.25-1.0 mm AlN sheets, thin ceramic substrates, test coupons, larger machined plates<\/span><\/div>\n
Starting wire speed<\/strong>
\n800-1200 m\/min for AlN trial planning<\/span><\/div>\n
Starting feed range<\/strong>
\n0.1-0.3 mm\/min, then adjust by chip size, Ra, and wire load<\/span><\/div>\n
Coolant default<\/strong>
\nWater-free or oil-based unless the substrate maker approves a water-based process<\/span><\/div>\n
Main inspection points<\/strong>
\nKerf, Ra, edge chips, sub-surface cracks, bow, residue, and dimensional drift<\/span><\/div>\n
Best fit<\/strong>
\nHigh-value brittle ceramic cutting where scrap cost matters more than raw cut speed<\/span><\/div>\n<\/div>\n<\/section>\n
\n

Why Aluminum Nitride Substrate Cutting Needs a Different Process Window<\/h2>\n

\"Why<\/p>\n

Aluminum nitride, also written aluminium nitride in some material specs, is not just another white ceramic plate. Its value comes from a rare mix of high thermal conductivity, electrical insulation, low thermal expansion, and service in power electronics where heat must leave a chip or power module without creating an electrical path.<\/p>\n

<\/p>\n

Reference data for AlN show why buyers care. Ioffe Institute’s NSM Archive lists a maximal measured thermal conductivity at 300 K of 2.85 W cm-1 K-1, equal to 285 W\/(m K), and thermal expansion coefficients of 5.27 x 10-6 K-1 along the c axis and 4.15 x 10-6 K-1 along the a axis over 20-800 deg C. Those figures explain why AlN substrates are used where heat, insulation, and expansion matching all matter.<\/p>\n

Bulk aluminium nitride data is useful, yet each component still carries its own density, grain quality, and processing history. Matching the cutting technology to those details helps protect the real part, not just the material name on a drawing.<\/p>\n

\n

Material-property handoff before cutting<\/h3>\n

Ask the substrate manufacturer for material properties, sizes and thicknesses, density range, and whether the piece is bulk aluminum nitride, a metallized plate, or another AlN ceramic form. Bulk AlN substrates are not judged by one thermal number alone; wurtzite structure, crystal quality, insulating properties, oxidation history, and circuit cleaning can all affect release.<\/p>\n

In a PCB, power module, or high power package, the part has to insulate while helping the assembly cool. Do not turn a phrase such as “extremely high thermal conductivity” into an acceptance criterion unless the grade, test method, and functional electronics applications are clear before manufacturing teams integrate the part.<\/p>\n<\/div>\n

That ceramic property package leaves little room for rough handling during cutting. Small edge chips can become stress raisers. Hidden cracks may show up later during metallization, bonding, thermal cycling, or module assembly. Residue from the wrong coolant can also become a cleaning and reliability issue.<\/p>\n

Because of that, the practical goal is not simply to cut through the material. Define a process window that protects the usable area of the substrate, keeps the kerf predictable, and gives quality teams enough evidence to release the part.<\/p>\n<\/section>\n

\n

The AlN Damage Modes That Matter: Chipping, Sub-Surface Damage, and Coolant Risk<\/h2>\n

\"The<\/p>\n

Visible damage often starts as edge chipping. It usually appears at the entry edge, exit edge, or unsupported corners. It is easy to see, easy to measure, and often the first reason a high-value part is rejected.<\/p>\n

Harder to catch is sub-surface damage. Brittle ceramics can remove material through fracture, micro-crack growth, local ductile zones, and amorphized layers near the cut face. At low magnification, a surface may look acceptable while the near-surface region still carries damage.<\/p>\n

<\/p>\n

\n

Engineering Note<\/strong><\/p>\n

A 2026 Diamond and Related Materials abstract on diamond wire sawing of AlN reports a stable micro-amplitude oscillation window at 25-35 Hz and surface-quality degradation above 40 Hz. It also reports that lateral wire oscillation reduced the brittle-transition critical pressure from 2039.58 bar to 1129.32 bar while increasing amorphization and damage depth. In practice, more aggressive wire motion may remove material faster, but the cut face can pay for it.<\/p>\n<\/div>\n

Chemical and cleaning risk is the third damage mode. AlN is often discussed as a high thermal conductivity ceramic, but coolant chemistry cannot be treated casually. Some processes that are acceptable for alumina or zirconia may be a poor first choice for AlN substrates.<\/p>\n

<\/p>\n

In 2023, Journal of Advanced Ceramics reported that raw AlN powder reacts easily with water to form Al(OH)3 or AlOOH. Finished substrates vary by purity, sintering aid, surface condition, and supplier, so the safest article-level rule is narrower: do not approve a water-based cutting process for AlN without supplier clearance, cleaning validation, and a sample-cut inspection record.<\/p>\n<\/section>\n

\n

Diamond Wire Saw Parameters for Aluminum Nitride Substrates<\/h2>\n

\"Diamond<\/p>\n

Diamond wire sawing is a strong fit for thin AlN substrates because it can keep cutting force low while using a narrow abrasive path. It also supports controlled wet cutting, steady feed, and repeatable wire tension when the machine is built for brittle ceramics.<\/p>\n

<\/p>\n

In DONGHE ceramic wire saw selection, the AlN starting point is 800-1200 m\/min wire speed, 0.1-0.3 mm\/min feed, and oil-based coolant. Treat those figures as trial-window inputs, not universal release specs. Thickness, substrate size, metallization status, desired Ra, and maximum edge chip allowance still decide the final setup.<\/p>\n\n\n\n\n\n\n\n\n\n
Parameter<\/th>\nStarting point<\/th>\nWhat to watch<\/th>\n<\/tr>\n<\/thead>\n
Wire speed<\/td>\n800-1200 m\/min<\/td>\nWire stability, vibration marks, cut face temperature, edge chip growth<\/td>\n<\/tr>\n
Feed rate<\/td>\n0.1-0.3 mm\/min<\/td>\nRa, wire loading, bow, corner break-out, exit-side chipping<\/td>\n<\/tr>\n
Wire diameter<\/td>\nMatch to kerf and stiffness target<\/td>\nKerf loss, wire deflection, abrasive exposure, tension margin<\/td>\n<\/tr>\n
Abrasive grit<\/td>\nFine enough for Ra target; open enough to clear swarf<\/td>\nSurface scratches, wire loading, cut time, local heating<\/td>\n<\/tr>\n
Coolant<\/td>\nOil-based or other water-free system first<\/td>\nResidue, cleaning route, AlN-water compatibility, downstream bonding<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

If the project involves very thin nitride substrates, metallized AlN, or a tight cosmetic edge requirement, run the first coupon as a documented sample cut. Record wire, feed, coolant, fixture contact, kerf, Ra, chip size, and microscope images before releasing the next batch.<\/p>\n<\/section>\n

\n

Coolant and Fixturing Rules for AlN: The Oil-Coolant Decision Gate<\/h2>\n

\"Coolant<\/p>\n

Coolant selection for AlN is a decision gate, not a small machine setting. It affects heat removal, swarf flushing, chemical exposure, cleaning, and later assembly. Start with a water-free coolant when no supplier-approved water route exists.<\/p>\n

\n
\n

Use oil-based coolant first when<\/h3>\n