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5 Types of Ceramics Used to Make Cutting Tools

10/19/2021

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A very helpful article from our friends at NTK Cutting Tools.
5 types of ceramics used to make cutting tools NGT NTK
When you hear the word “ceramic”, the first thing people may think of is the “white” material used for plates and sanitary ware (toilets).

​But that type of ceramic is just one of a number of ceramics. There are as many as five ceramics used for cutting tools.In this article, we will introduce the 5 types of ceramic used in cutting tools.

What is ceramic in the first place?

IIn a broad sense, ceramics are a blend of metal or nonmetal with oxygen (O), nitrogen (N), carbon (C), etc., and this baked material is used as a cutting tool.

The ceramic used in cutting tools is roughly available in two types of “Alumina ceramic” (Al2O3) and “silicon nitride (Si3N4) ceramic” made by blending various additives with the main ingredients to develop specific characteristics.

It is further subdivided by the addition of various additives to the main ingredients.

Al2O3 : Alumina-based ceramics

White Ceramic Alumina Al2O3
1. White Ceramic
Alumina  (Al2O3) is the main component of ceramic, and is called white ceramic because of its color. In fact, the same ingredients are in jems like rubies and sapphires (Al2O3)
​
The main difference is that ruby and sapphire are single crystals (particles of one large mass), while alumina is polycrystalline (a collection of multiple particles). Alumina is hard and chemically stable.  Taking advantage of its properties, it is used in high-speed finishing of cast iron.
Bkack Ceramic TiC
2. Black Ceramic
Titanium carbide (TiC) is added to alumina, and this is called black ceramic because of its color.

The addition of titanium carbide results in higher hardness, than white ceramic, and suppresses deformation of the cutting edge due to heat; even at high temperatures.
​
Taking advantage of its properties, it is used in high-speed finishing of hardened materials up to about HRC65.
Whisker Ceramic SiC
3. Whisker
It is a ceramic in which silicon carbide (SiC) is added to alumina. Do you know why it’s called whisker ?

Silicon carbide has a needle-like shape similar to a “animal beard”, so it is now called whisker (ceramic).

By intertwining silicon carbide with each other, the progression of cracks due to impacts during cutting is suppressed, and cracks are prevented. In addition, it has a resistance against sudden temperature changes. Taking advantage of these properties, it is widely used for heat-resistant alloy processing.

Silicon nitride, Si3N4

Silicon Nitride Si3N4 Ceramic
5. Silicon Nitride
Silicon nitride (Si3N4) is the main component, and a special feature is that the particles are needle-like, different from the alumina compound.

By intertwining needle-like particles, the progression of cracks due to impact during cutting can be greatly suppressed, preventing cracks.
​
Taking advantage of these properties, it is used in high-speed roughing of cast iron.
Sialon Ceramic
5. Sialon
Silicon nitride (Si3N4), Aluminum (Al), and oxygen (O)are blended to form SiAlON, which is an initial of its component elements.

Sialons, like silicon nitride, have needle-like particles. Needle-like particles intertwine to withstand impact during cutting.

In addition, the effect of the added alumina component improves heat resistance over silicon nitride, and has excellent high temperature resistance characteristics.
​
Taking advantage of these properties, it is used in high-speed processing of heat-resistant alloys.

The table below shows typical machining application examples of ceramic cutting tools.

 typical machining application examples of ceramic cutting tools
We hope this column gave you a better understanding of the types, differences, and features of ceramic materials.
​
Ceramic cutting tools must be used according to the material to be machined, but they can be processed up to 20 times faster than carbide tools. Increase productivity with ceramic cutting tools for your material applications.
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Tech Tips forĀ Machining Hardened Materials with CeramicĀ and CeramiX

1/12/2021

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Machining Hardened Materials with Ceramic
Here are some simple quick tips when you are machining machining hard materials. 
  • As material hardness goes up the SFM goes down.
  • Use the strongest possible insert shape to maximize insert strength.
  • Ceramic is a hard material therefore, the insert needs some edge preparation in order to withstand cutting forces and optimize performance.
  • Utilize positive geometries for close tolerances or thin-walled parts.
  • If multiple passes are required with one edge, vary the DOC to move the wear on the insert edge and improve tool life.
  • If you encounter chatter, increase your feed rate. Heavy chatter is often a sign of the tooling being above centerline or there is too much toolholder overhang. The machine, part and tooling set-up must be rigid.
When you're considering inserts from NTK Cutting Tools for hard turning, take a look at the grades and styles.
  1.  Light edge preps T styles ( T-land:  T0425  & T0525)
  2.  Heavy edge preps:  Z and S style ( T-land and honed edge: Z0820, Z0825, S0820, S0825) or  J, P, and Q style (Double Chamfered and Honed edge: P4815,  P8015, Q8015)
NTK hard Turning SFM Speed chart based upon material hardness
Hard Turning Speed SFM chart based upon a material's Shore Hardness.. As the hardness increases the SFM decreases.
Hard Turning IPR Feed Rate based upon ceramic insert nose radius and DOC
Some good rules of thumb for Hard Turning: The IPR Feed Rate is based upon ceramic insert nose radius and Depth of Cut (DOC)
Hard Turning SFM IPR chart Speed Feed
Best choice of ceramic insert grades for use in hard turning from NTK
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The Ultimate Ceramic Grade for Finishing Hardened Materials: "NTK CeramiX" HX5

7/15/2020

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NTK CeramiX HX5 replaces CBN
NTK HX5 CeramiX Wear Comparison to CBN competitors
NTK developed this latest game changing ceramic material NTK CeramiX HX5 to replace CBN. As a ceramic cutting tool specialist, NTK has been researching new advancements for ceramics in the industry for decades.

They recently introduced a new grade that matches CBN on performance.
The new CeramiX "HX5" grade provides a cost saving solution for hard turning applications.  It's designed for Hard Turning with continuous cut in the Hardness range of 55 to 66HRc
NTK HX5 CeramiX Wear Comparison to CBN Chart
NTK HX5 CeramiX Wear Comparison to Competitors CBN. This chart corresponds to the photos above.
  • NTK CeramiX is an advanced ceramic material achieving the performance to compete with CBN.
  • New TiAlN coating offers excellent wear resistance for hard turning.
  • In continuous machining materials with a hardness of 55 to 65 HRC, HX5 matches the performance of CBN

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Next Generation Tooling Now Offers Technical Training!

6/14/2017

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We are very excited to announce that we are now able to offer on-site technical training to YOUR machinists at YOUR location!  This is offered at no charge  to customers who use any of the manufacturer's whom we represent in California and Nevada.  

However, just because you don't purchase things from us, don't feel left out! We also offer on-site topic specter training on any of the following topics for $150/hour.  

Each presentation lasts about 2 hours.  The presentations last approximately 45-60 minutes with the remaining time for Q&A and discussion about unique applications in your facility.
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Training Classes Available:
Machining 101
  • Basic Boring
  • Basic Chamfering
  • Basic Drill Training
  • Basic End Mill
  • Basic Indexable
  • Basic Tap Training
  • Basic Tool Holders
  • Basic Work Holding / Fixturing​

Advanced Part Manufacturing:
  • Programming Tool Path – Climb versus Conventional
  • Material Machinability – Cubic Inches of Stock Removal
  • Part Set Up / Work Holding / Fixture 
  • Tool Holder Selection, Collet, Solid, Hydraulic, Shrink Fit
  • Cutting Tool Selection – Substrate, Geometry, Coating, Speed and Feeds 
  • Estimating Part Cycle Time
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5 Types of Ceramic Cutting Tools & Their Uses

3/14/2012

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Ceramic tools have high resistance to heat and to wear and can be used to machine metals that are extremely hard, and they are chemically stable. These attributes allow them to be used to machine metals at high cutting speeds and in dry machining conditions because it is not necessary to reduce temperatures on the cutting edges of these tools.

​However, these favorable properties are exchanged in machining for lower toughness when these tools are compared with carbide tools. This deficiency can be offset by selecting an appropriate ceramic cutting grade and the type of tool.

Ceramic tools are based primarily on alumina (Al2O3) and silicon nitride (Si3N4) compounds and are available in a variety of grades that include ceramics mixed with other materials and reinforcing whisker materials that make them harder.

Oxide ceramics

Ceramic or “cemented oxide” tools are made primarily from alumina and can contain additions of titanium, magnesium, chromium or zirconium oxides or silicon-carbide grains that are distributed homogeneously throughout the alumina matrix to improve toughness.

Cemented oxides are relatively brittle and require highly rigid and vibration-free machines and setups.
Picture
The materials are molded at pressure more than 4,000 psi and they are sintered at approximately 3,000 degrees F. This process accounts in part for the high density and hardness of these tools.

​Oxide ceramics are used primarily for rough and finish turning, for grooving of gray and nodular cast iron and for continuous cutting at high cutting speeds without the use of coolant.


Ceramic tools are stable at extreme temperatures as high as 4,000 degrees F., unlike carbide and cement tools that contain metallic binders and begin to soften at temperatures greater than 1,000 degrees F.

Whiskered ceramics

Reinforced or whiskered, ceramics use extremely fine-grained silicon-carbide crystals that are called “whiskers” because they resemble small hairs under a microscope to reinforce and toughen basic ceramic compounds.

In ceramic tool materials, single-crystal silicon carbide whiskers, on the order of one micron in diameter and 0.003937 in. (100 microns) in length, are intertwined within the alumina-matrix structure. These whiskers have a tensile strength of about 1 million psi and dramatically improve the fracture toughness of the tool material. They also effectively block and prevent propagation of cracks.
Picture
Reinforced ceramics work differently from other cutting materials. With reinforced ceramic cutting tools, the objective in machining is to generate high temperatures ahead of the cutting tool to soften or plasticize the workpiece material. 

That facilitates the removal of material and a reduction in cutting forces. The ideal cutting temperature in nickel alloy is about 1,800 degrees F, for example.

​
Cutting with ceramic inserts requires high surface speed and balanced feedrates. High speed is necessary to generate the high temperature in the shear zone and to ensure that the heat propagates into the chip-forming zone immediately ahead of the cutter. When cutting speeds are too slow, insufficient heat is generated to soften the material in this zone, and the cutting forces are raised and insert failure occurs.

A strategy for using ceramic inserts is to program fewer, but deeper cuts that bury the insert deep in the workpiece. This moves the notch formation further up the face of the insert to an area that has a larger, stronger cross section. Ramping cuts should be programmed to accommodate these tools and fixed depths of cut should be avoided to spread wear over a larger section of the insert.

When machining interrupted cuts with reinforced ceramics, it is important to keep the speed of the cutter high. A rule of thumb is to estimate the percentage of voids in the workpiece surface and increase cutting speed by that percentage. This increase in surface speed offsets the loss of heat generation created by the voids.

Whiskered ceramics work best on hard ferrous materials and difficult-to-machine nickel-base alloys, including Inconel, Waspoloy and Hastelloy. They do not work well on ferrous alloys below Rc 42 hardness because of the chemical reaction that occurs between iron and the carbon that is part of the silicon carbide reinforcing material.

Silicon nitrides

Ceramics based on silicon nitride offer increased resistance to abrasion and thermal shock and have high fracture toughness.
These ceramic tools have a needle-like structure that is embedded in a temperature-resistant grain-boundary.

​These structures enhance crack deflection, crack bridging and pull-out effects, and lead to superior fracture toughness.
Picture
These materials are based on compositions of ceramic powders with high purity. Techniques used to produce these ceramics, including optimized powder processing and gas-sintering, enhance their fracture toughness and high-temperature hardness.

Silicon nitrides are well suited for rough machining cast iron, even under unfavorable conditions such as heavily interrupted cuts and varying depths of cut. Silicon nitrides also are used to mill cast iron, even with positive tool geometries.

Silicon nitrides are suitable for milling operations that produce chips with large cross sections and require positive tool geometries.

​When used with powerful machine tools, silicon nitrides enable high cutting speeds (more than 800 in./min.) and feeds (0.2 to 0.3 in./min.) for rough boring cast iron.


Silicone nitride tools offer fracture resistance, but their relatively low resistance to chemical wear limits their use in machining nodular cast irons.

​However, wear-resistant, chemical vapor deposit (CVD) alumina coatings have expanded the range of applications for silicon nitride-based tools to include these difficult-to-machine irons. Gray cast iron and nodular graphite cast iron can be milled at cutting speeds of 500 to 800 in./min or sometimes faster than 1,000 in./min.

Five Types of Ceramic Cutting Tools.

There are five types os ceramic cutting tools.  Here are the basic differences:

ALUMINIUM OXIDE OR WHITE CERAMIC
NTK GRADES: HC1, CX3, HW2
Pure alumina strengthened by Zirconium.
  • High hardness but relatively low strength, toughness and thermal conductivity making them prone to cracking if used with coolant.
  • Offer excellent wear characteristic making this range ideal for finish turning, boring and grooving of Cast Iron as well as
  • Tube Scarfing.

MIXED OR BLACK CERAMICS 
NTK GRADES: HC2, HC4, HC5, ZC4
Alumina with metallic phase of Titanium Carbide and Titanium Nitride which improves thermal conductivity.
  • Increased ability to cope with extreme cutting conditions.
  • Used mainly for hard part machining (up to HRC62).
  • Used extensively in Steel and bearing markets and for Cast Iron finishing operations.
  • Recent improvements has seen greater wear resistance and toughness due to higher density and reduced porosity.
  • The main advantage that mixed ceramic has over Cubic Boron Nitride (CBN) in hard part machining applications is the effect on part production costs. Whilst CBN has a better tool life, the cost per edge of a ceramic insert is a fraction of that of CBN (approx one twentieth) whilst feed rates (chip thickness around 0.1mm) and cutting speeds (range between 50 - 200m/min) are not significantly higher.

SILICON NITRIDE BASED CERAMICS
NTK GRADES: SX1, SX2, SX8, SP2
  • Low thermal expansion makes this range very resistant to thermal shock.
  • High breaking strength sees their use in rough turning (even with heavily interrupted cuts), boring and milling of Cast Iron.
  • Offers exceptional tool life.
  • Cutting speeds up to 1000m/min, feeds of 1mm/rev.
  • More stable in operations but tends to suffer from normal flank and crater wear rather than failures associated with white and black ceramics.

WHISKER REINFORCED CERAMICS
NTK GRADES: WA1
Pure alumina structurally strengthens from introduction of Silicon Carbide in the form of whiskers.
  • Added tensile strength and fracture toughness even at elevated temperatures.
  • Ideal for high speed machining for Nickel based Aerospace alloys e.g. Inconel 718 correspondingly greater metal rates.

SIALONS
NTK GRADES: SX5
Alumina substrate strengthened by Silicon Nitride.
  • A lower cost option than Whisker ceramic (but lower performance).
  • Widely specified and used in the machining of Aerospace alloys.

The above text is from American Machinist's Cutting Tool Central.  For up to the minute information follow them on Twitter @AmericanMachnst
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    Technical Support Blog

    At Next Generation Tool we often run into many of the same technical questions from different customers. This section should answer many of your most common questions.

    We set up this special blog for the most commonly asked questions and machinist data tables for your easy reference.

    If you've got a question that's not answered here, then just send us a quick note via email or reach one of us on our CONTACTS page here on the website
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    Authorship

    Our technical section is written by several different people. Sometimes, it's from our team here at Next Generation Tooling & at other times it's by one of the innovative manufacturer's we represent in California and Nevada.

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Next Generation Tooling
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Lodi, CA 95240
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