leco grinding and polishing catalog

Instrument: GPX-200 Automatic Grinder/Polisher Improved Method for Grinding and Polishing Cemented Carbide (WC-Co) For Metallographic Analysis Utilizing LeStar Polishing Film Equipment Setup Cemented Carbides Preliminary Sample Preparation Typical Metallographic Preparation Method GPX-200 Automatic Grinder/Polisher with a CAMEO Platinum I Grinding Disc and a 1 micron LeStar Polishing Film. Cemented carbides are very hard composites made by sophisticated powder metallurgy processes. They occasionally involve carbides besides the usual Tungsten Carbide (WC). The binder phase is normally cobalt (usually 6 to 12% by weight), although nickel can also be used. Metallographic studies of cemented carbides are unique, but need not be difficult. Because of their high hardness, cemented carbides are sectioned with a diamond precision saw. Their high hardness also requires that special grinding and polishing procedures be used. Detailed are two procedures for metallographically preparing sintered carbides for optical microscopy. The first is a "typical" procedure involving grinding with a CAMEO Platinum (diamond) disc followed by a "pre- polishing" step and two polishing steps. The second procedure involves one grinding step followed by a single polishing step, using LECO's recently introduced LeStar diamond polishing film consisting of spherical particles composed of a primary diamond and nanoparticles. This streamlined procedure provides a comparable polish in less than half the time, with lower consumables costs. Grade C-2 Cemented Carbide [94% Tungsten Carbide – 6% Cobalt] Saw VC-50 Blade 5" x 0.025" – Diamond Blade (P/N 802-439) Speed (RPM) 500 Coolant/Rust Inhibitor P/N 811-023 Press PR-32 Media Bakelite Other Comments P/N 811-111 "Normal Cycle" Sample Identification Sectioning Mounting Grinding - Pre-Polishing - Polishing Etching Total Preparation Time GPX200 (10" Wheel) - Fixed Sample Holder Platinum #1 2:00 CW 35 75 CCW 200 (812-337)/Water FAS Magnetic System/10"/(812-382) Silver Disk/ 2:00 CW 35 75 CCW 200 6 μm Cameo Suspension/Microid Extender (812-340/812-356/811-003) 3 μm Premium 3:00 CW 40 100 CCW 200 Suspension/Ultra Silk/ Microid Extender (810-997-016/812-438/811-003) 1 μm Premium 0:30 CW 40 100 CCW 200 Suspension/Red Felt/ Microid Extender (810-998-016/812-225/811-003) Murakami's 00:20 to 00:30 Approximately 13 Minutes Time Head Head Head Wheel Wheel (Min:Sec) Direction Pressure Speed Direction Speed (Pounds) (RPM) (RPM) Time Head Head Head Wheel Wheel (Min:Sec) Direction Pressure Speed Direction Speed (Pounds) (RPM) (RPM) Time Head Head Head Wheel Wheel (Min:Sec) Direction Pressure Speed Direction Speed (Pounds) (RPM) (RPM) Time (Min:Sec) LECO Corporation; Saint Joseph, Michigan USA ® Metallographic Application Note

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Leco Grinding and Polishing Catalog

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Instrument: GPX-200 Automatic Grinder/Polisher

Improved Method for Grinding and PolishingCemented Carbide (WC-Co) For MetallographicAnalysis Utilizing LeStar Polishing Film

Equipment Setup

Cemented Carbides

Preliminary Sample Preparation

Typical Metallographic Preparation Method

GPX-200 Automatic Grinder/Polisher with a CAMEOPlatinum I Grinding Disc and a 1 micron LeStarPolishing Film.

Cemented carbides are very hard composites made bysophisticated powder metallurgy processes. Theyoccasionally involve carbides besides the usualTungsten Carbide (WC). The binder phase is normallycobalt (usually 6 to 12% by weight), although nickelcan also be used. Metallographic studies of cementedcarbides are unique, but need not be difficult. Becauseof their high hardness, cemented carbides aresectioned with a diamond precision saw. Their highhardness also requires that special grinding andpolishing procedures be used.

Detailed are two procedures for metallographicallypreparing sintered carbides for optical microscopy. Thefirst is a "typical" procedure involving grinding with aCAMEO Platinum (diamond) disc followed by a "pre-polishing" step and two polishing steps. The secondprocedure involves one grinding step followed by asingle polishing step, using LECO's recently introducedLeStar diamond polishing film consisting of sphericalparticles composed of a primary diamond andnanoparticles. This streamlined procedure provides acomparable polish in less than half the time, withlower consumables costs.

Grade C-2 Cemented Carbide[94% Tungsten Carbide – 6% Cobalt]

Saw VC-50Blade 5" x 0.025" – Diamond

Blade (P/N 802-439)Speed (RPM) 500Coolant/Rust Inhibitor P/N 811-023

Press PR-32Media BakeliteOther Comments P/N 811-111

"Normal Cycle"

Sample Identification

Sectioning

Mounting

Grinding -

Pre-Polishing -

Polishing

Etching

Total Preparation Time

GPX200 (10" Wheel) - Fixed Sample Holder

Platinum #1 2:00 CW 35 75 CCW 200(812-337)/Water

FAS Magnetic System/10"/(812-382)

Silver Disk/ 2:00 CW 35 75 CCW 2006 µm CameoSuspension/Microid Extender (812-340/812-356/811-003)

3 µm Premium 3:00 CW 40 100 CCW 200Suspension/Ultra Silk/Microid Extender (810-997-016/812-438/811-003)

1 µm Premium 0:30 CW 40 100 CCW 200Suspension/Red Felt/Microid Extender (810-998-016/812-225/811-003)

Murakami's 00:20 to 00:30

Approximately 13 Minutes

Time Head Head Head Wheel Wheel(Min:Sec) Direction Pressure Speed Direction Speed

(Pounds) (RPM) (RPM)

Time Head Head Head Wheel Wheel(Min:Sec) Direction Pressure Speed Direction Speed

(Pounds) (RPM) (RPM)

Time Head Head Head Wheel Wheel(Min:Sec) Direction Pressure Speed Direction Speed

(Pounds) (RPM) (RPM)

Time (Min:Sec)

LECO Corporation; Saint Joseph, Michigan USA

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Page 2: Leco Grinding and Polishing Catalog

Sample after grinding with Platinum I disc.

After conventional grinding, polishing, and etching.

1500X - BF

Sample after grinding and conventional polishing.

1000X - DIC

1500X - BF

After grinding, LeStar polishing, and etching.

1000X - DIC

Sample after Platinum I grind and LeStar polish.

Sample after grinding with Platinum I disc.

Conventional Metallographic PreparationMetallographic Preparation withLeStar Polishing Film

Improved Metallographic Preparation Method

Grinding -

Polishing -

Etching

Total Preparation Time

GPX200 (10" Wheel) - Fixed Sample Holder

Platinum #1 2:00 CW 35 75 CCW 500(812-337)/Water

1 µm LeStar Diamond Film/Water

1 µm LeStar 2:00 CW 35 75 CCW 500Diamond Film (812-488) /Water

Murakami's 00:20 to 00:30

Approximately 8 Minutes

Time Head Head Head Wheel Wheel(Min:Sec) Direction Pressure Speed Direction Speed

(Pounds) (RPM) (RPM)

Time Head Head Head Wheel Wheel(Min:Sec) Direction Pressure Speed Direction Speed

(Pounds) (RPM) (RPM)

Time (Min:Sec)

LECO Corporation3000 Lakeview Avenue • St. Joseph, MI 49085 • Phone: 800-292-6141 • Fax: [email protected] • www.leco.com • ISO-9001:2000 • No. FM 24045 • LECO is a registered trademark of LECO Corporation.In cooperation with Saint-Gobain Abrasives, Inc. • Norton and Nanozyte are trademarks of Saint-Gobain Abrasives, Inc.

Delivering the Right Results

Del

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ing

the

Righ

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sults

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