"Acceptable (or Assured) Quality Level". Relates to the confidence level of a group of products having a specified maximum percentage of defects.
A type of mill which utilizes spinning arms to agitate grinding media to impact and mill particles.
The material behind the piezo element which absorbs or reflects the acoustic signal emitted from the back of the element.
A cylindrical container partially filled with grinding media which is rotated to allow the media to tumble and, in so doing, to mill particles to a finer size.
A material added to powder to hold it together for forming.
The act of removing binder from a powder compact by heating. Sometimes called "binder burn-out".
The act of slowly stirring a slip to keep it from settling.
A type of kiln which is designed for a batch of product at a time rather than a continuous flow. Usually shaped like a box.
The act of heating a mixture of materials to cause a chemical reaction that forms the desired compound.
Short for "Capacitance". A measure of how much energy is stored in a body when an electrical field is applied.
The measurable normal variability of a process or machine. Usually expressed as Cp or Cpk.
An inorganic non-metallic solid material. Usually "ceramic" also implies a polycrystalline agglomerate rather than a single crystal or a glassy substance.
A mixture of two or more different materials to create a device with some properties from both materials. Composites are described as 1-3 (one dimensional posts within a three dimensional matrix), 3-3 (a sponge), 2-2 (stacked plates), etc.
A measure of how efficiently a material converts electrical energy to mechanical motion (or vice versa). Coupling is usually abbreviated k (kt, k33, k13, kp, etc). It is also a term for the transfer of energy from a transducer in or out of a medium. See also "matching layer".
A single piece of material with a uniform atomic arrangement.
Also known as "Curie temperature", abbreviated Tc. The temperature at which a piezoelectric material becomes paralectric and loses its interesting properties.
A measure of the relationship between electric field and strain in a piezoelectric material.
A material added to a mixture of powder and liquid to keep the powder from clumping or "flocculating".
Short for "Dissipation Factor". A measure of the amount of energy lost when an electrical field is applied to a material. Sometimes known as tan delta (tan d).
A type of material which is normally an electrical insulator.
A material property which measures the ability of a material to store energy (rather than pass current) when an electrical field is applied. Usually given the symbol “K” or “KT33”.
A material added to a mixture of powder and liquid to keep the powder in suspension.
Short for "Dielectric Withstanding Voltage". The voltage at which a material will break down and arc.
The separation of positive (+) and negative (-) electrical charges resulting in a net electric field in the direction of the positive charge.
"Anti-resonant Frequency". Fa is approximately at the point of maximum electrical impedance of the part. Similar frequencies are Fn and Fp.
"Resonant Frequency". The natural frequency at which a part resonates. "Fr" is at the approximate point of minimum electrical impedance of the part. Fr is inversely proportional to the controlling dimension of the part. Similar frequencies are
Fm and Fs.
A material property which relates resonant frequency to physical dimension. Usually given the symbol “N”. Fr times the controlling dimension equals the frequency constant.
The act of creating small uniform agglomerates of a powder.
The act of machining an object with the abrasive material constrained by an immovable binder. For example, diamond particles in a resin or alumina particles in a ceramic cylinder. The purpose of grinding is to remove material.
Short for "High Intensity Focused Ultrasound".
Short for "Hot Isostatic Press". A means of applying both high temperature and pressure at the same time to sinter a powder compact. The pressure is applied isostatically.
A machine which applies both high temperature and high pressure at the same time to densify a powder compact. The pressure is applied uniaxially.
Short for "Insulation Resistance".
Short for "International Organization for Standardization". Commonly mistaken ito be "International Standardization Organization".
Short for "Isostatic Press". A type of press which exerts a uniform pressure from all directions at once.
An enclosure designed to take materials to high temperatures. Pronounced "kill". Not to be confused with an oven which is used to bake cookies.
The act of machining an object with the abrasive material free to move. The purpose of lapping is to remove material.
Short for "Lead Metaniobate". A family of piezoelectric materials with unique wide bandwidth properties.
One or more layers of material in between an active ceramic element and the material it is propagating sound into. A "Matching Layer" is used to more efficiently allow energy to move between the two disparate materials. See also Coupling.
The average of a group of values.
The middle value in a ranked list of values.
One thousandth of an inch. (0.001″)
The act of breaking down particles to smaller sizes.
Morphotropic phase boundary
The boundary between different crystal phases defined by a change in composition rather than temperature or pressure.
A type of mixing device which utilizes rotating wheels.
Short for "Non-Destructive Testing". A means of evaluating something without damaging it in the process.
A material which creates an electrical voltage when squeezed or which strains when an electrical field is applied.
PZT modified with Lanthanum. Usually this designation refers to an electro-optic material. “PLZT” was a registered
trademark of Optoceram (later Motorola and CTS).
Short for "Lead Magnesium Niobate-Lead Titanate".
The act of polarizing a material by applying a high voltage, often at an elevated temperature.
The act of machining an object with the purpose of flattening or smoothing the surface rather than removing material.
A method of drying a slip into fairly uniform particles suitable for calcining.
Originally short for "Lead Zirconate Titanate" [Pb(ZrTi)O3]. "PZT" was a registered trademark of the Vernitron Company (later Morgan Electroceramics), but has come to be a generic term for the family of materials based on lead zirconium titanium oxide.
A container, usually box-like, for containing ceramic bodies during firing. The sagger can withstand high temperatures and the atmosphere around the bodies.
The act of passing a material through a mesh of known size to separate larger and smaller particles. Also the mesh device itself.
A method of applying an ink pattern to a substrate by passing it through a patterned screen.
The act of densifying a powder compact by applying heat.
A suspension of powder and liquid, usually with binder.
"Standard Operating Procedure". A document describing the steps required to accomplish a task.
A means of drying a slip and forming a free-flowing powder with binder suitable for pressing.
"Statistical Process Control". A means by which processes can be monitored and controlled.
The distance from the mean in which about 34% of a set of values falls. Also known as "sigma" (s).
A type of mill which utilizes a vibratory action to cause grinding media to impact and mill particles.
Short for "Temperature Coefficient of Capacitance". A measure of the variation of capacitance with temperature.
A device used to measure temperature.
A type of kiln which is designed for a continuous flow of product along a track, bed, or belt.
A type of press which exerts pressure along a single axis.
A type of device used to blend powders. Named after the shape of the container which rotates and tumbles the powders together.