NTC Ceramic HT (High-temperature NTC)
Heat-treated state
Use for exhaust-gas and heater measuring points: the spinel-plus-perovskite (Y-Cr-Mn oxide) body has high resistivity and ageing resistance and runs continuously at 500–1000 °C.
Values for the HT condition
Other NTC Ceramic tempers and conditions
NTC Ceramic is listed in 4 conditions; see the grade overview at NTC Ceramic.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Mn-Ni-Cu-Fe low-resistivity power grade | Pick large-diameter discs for inrush-current limiting: low resistivity and high heat capacity let the element survive repeated energisation and self-heating up to 200 °C. | — | 50 | 0 | 640 HV | 4 W/m·K |
MNCDefault Mn-Ni-Co spinel, standard sensing grade | Default for temperature measurement and compensation chips or discs: medium room-temperature resistivity, B25/85 of 3400–4000 K and tight unit-to-unit consistency up to 150 °C. | — | 60 | 0 | 700 HV | 4 W/m·K |
Fine-grain bead body for glass-encapsulated precision thermistors | Choose the fine-grain, high-density bead body for glass-encapsulated probes needing ±0.1 °C-class accuracy and the best long-term stability, such as medical sensors, to 300 °C. | — | 70 | 0 | 760 HV | 5 W/m·K |
HTThis page High-temperature NTC | Use for exhaust-gas and heater measuring points: the spinel-plus-perovskite (Y-Cr-Mn oxide) body has high resistivity and ageing resistance and runs continuously at 500–1000 °C. | — | — | — | 800 HV | 4 W/m·K |
What is NTC Ceramic HT?
NTC Ceramic HT is NTC Ceramic heat treated to HT — use for exhaust-gas and heater measuring points: the spinel-plus-perovskite (Y-Cr-Mn oxide) body has high resistivity and ageing resistance and runs continuously at 500–1000 °C. NTC Ceramic HT has a tensile strength of 60 MPa (8.7 ksi), weaker than 63% of ceramic grades. Elongation at break is 0% and the elastic modulus is 135 GPa (19.6 Msi). NTC Ceramic HT has a density of 5.3 g/cm³ (0.191 lb/in³), heavier than 54% of ceramic grades. It melts at 1,500°C (2,732 °F). MNC is the default condition FabDigit quotes; HT is available on request or by drawing note.
Limitations
- Hard to polish — 60/100, worse than 79% of ceramic grades
NTC Ceramic HT properties
Typical room-temperature values for NTC Ceramic HT; 10 are specific to this condition. Other listed values are NTC Ceramic reference data and may not represent this condition. Bars are the position among ceramic grades.
Physical3
NTC Ceramic HT has a density of 5.3 g/cm³ (0.191 lb/in³), heavier than 54% of ceramic grades. It melts at 1,500°C (2,732 °F).
Mechanical12
NTC Ceramic HT has a tensile strength of 60 MPa (8.7 ksi), weaker than 63% of ceramic grades. Elongation at break is 0% and the elastic modulus is 135 GPa (19.6 Msi).
Thermal5
NTC Ceramic HT is rated for continuous service to 900°C (1,652 °F). It conducts heat at 3.5 W/m·K (2.02 BTU/hr·ft·°F), worse than 74% of ceramic grades. Thermal expansion is 9 µm/m·K (5 µin/in·°F).
Electrical2
NTC Ceramic HT has an electrical resistivity of 5,000 Ω·m.
Chemical & Environmental2
Corrosion resistance is very good (78/100), better than 53% of ceramic grades.
Sustainability4
Producing a kilogram of NTC Ceramic HT takes about 90 MJ of energy and emits 7.5 kg of CO₂ — less than 62% of ceramic grades. Typical recycled content is 0%.
Manufacturability3
NTC Ceramic HT's machinability is not recommended (5/100, worse than 59% of ceramic grades).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with NTC Ceramic HT
Is NTC Ceramic easy to machine?
After sintering, only diamond grinding, ultrasonic machining or laser scribing are possible. Forming in the green state by dry pressing, tape casting and punching is the most economical route.
Can NTC Ceramic be welded?
The ceramic body cannot be welded. Electrodes are fired-on Ag or Ag-Pd paste or sputtered Ni-Cu, with leads attached by soldering or welding, or by a glass-sealed joint.
Can NTC Ceramic be formed, bent or molded?
Oxide powders are blended, ball milled, calcined, granulated and then dry pressed or tape cast, followed by air sintering at 1150-1350 C. The cooling rate governs cation distribution and therefore the B value.
What surface finishes work on NTC Ceramic?
Grind the end faces to hold thickness tolerance, screen print Ag electrodes and fire them at 700-850 C, then epoxy coat or glass encapsulate and burn in to stabilise resistance.
NTC Ceramic chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Mnadded as Mn3O4/MnCO3; main spinel B-site constituent | 25 – 45 | 36 |
| Nias NiO; adjusts B value and resistivity | 5 – 20 | 12 |
| Coas Co3O4; lowers resistivity, improves stability | 3 – 20 | 11 |
| Cuadded in power-type/low-resistance formulas | 0 – 8 | 0 |
| Fepower-type formulas and improved aging behavior | 0 – 8 | 0 |
| Alstabilizes the spinel phase in high-temperature types | 0 – 3 | 0 |
| Ooxygen site of the spinel (AB2O4) lattice | balance | — |
NTC Ceramic HT — frequently asked
What is NTC Ceramic HT used for?
NTC Ceramic HT is typically used for temperature sensors, inrush current limiters and battery pack thermal monitoring. In short: steep negative temperature coefficient; sensing and inrush limiting; green-formed net shapes.
What is the tensile strength of NTC Ceramic HT?
NTC Ceramic HT has a typical tensile strength of 60 MPa (8.7 ksi) — weaker than 63% of ceramic grades. Strength varies by condition: see the 4 listed tempers.
Is NTC Ceramic HT easy to machine?
Not especially — machinability is rated not recommended (5/100, worse than 59% of ceramic grades). After sintering, only diamond grinding, ultrasonic machining or laser scribing are possible. Forming in the green state by dry pressing, tape casting and punching is the most economical route.
Can NTC Ceramic HT be welded?
The ceramic body cannot be welded. Electrodes are fired-on Ag or Ag-Pd paste or sputtered Ni-Cu, with leads attached by soldering or welding, or by a glass-sealed joint.
What surface finishes work on NTC Ceramic HT?
Grind the end faces to hold thickness tolerance, screen print Ag electrodes and fire them at 700-850 C, then epoxy coat or glass encapsulate and burn in to stabilise resistance.
Can NTC Ceramic HT be formed, bent or molded?
Oxide powders are blended, ball milled, calcined, granulated and then dry pressed or tape cast, followed by air sintering at 1150-1350 C. The cooling rate governs cation distribution and therefore the B value.
What is the maximum service temperature of NTC Ceramic HT?
NTC Ceramic HT is rated for continuous use to about 900°C (1,652 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- IEC 60539-1 Directly heated negative temperature coefficient thermistors — IEC (2016)
- ASM Engineered Materials Handbook Vol.4: Ceramics and Glasses — ASM International (1991)
- NTC Thermistors — General Technical Information — TDK/EPCOS (2023)
- NTC Thermistor Application Notes — Vishay / Murata (2022)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.