Passive Components Blog
No Result
View All Result
  • Home
  • NewsFilter
    • All
    • Aerospace & Defence
    • Antenna
    • Applications
    • Automotive
    • Capacitors
    • Circuit Protection Devices
    • electro-mechanical news
    • Filters
    • Fuses
    • Inductors
    • Industrial
    • Integrated Passives
    • inter-connect news
    • Market & Supply Chain
    • Market Insights
    • Medical
    • Modelling and Simulation
    • New Materials & Supply
    • New Technologies
    • Non-linear Passives
    • Oscillators
    • Passive Sensors News
    • Resistors
    • RF & Microwave
    • Telecommunication
    • Weekly Digest

    TDK Releases Ultra-small PFC Capacitors

    KYOCERA AVX Releases Novel Mini BME Stacked Ceramic Capacitors

    Vishay Releases Class 1 Leaded High Voltage Ceramic Disc Capacitors

    TDK Releases 140C Compact Vibration Robust Automotive Aluminum Capacitors

    DigiKey Presents Factory Tomorrow Season 5 Video Series

    Samsung MLCCs Lineup for In-Vehicle Infotainment

    source: Samtec

    Best Practices for Cable Management in High-Speed and High-Density Systems

    Würth Elektronik Unveils Compact Common-Mode Data Lines Chokes

    Bourns Releases TCO 240 Watt USB Mini-Breaker

    Trending Tags

    • Ripple Current
    • RF
    • Leakage Current
    • Tantalum vs Ceramic
    • Snubber
    • Low ESR
    • Feedthrough
    • Derating
    • Dielectric Constant
    • New Products
    • Market Reports
  • VideoFilter
    • All
    • Antenna videos
    • Capacitor videos
    • Circuit Protection Video
    • Filter videos
    • Fuse videos
    • Inductor videos
    • Inter-Connect Video
    • Non-linear passives videos
    • Oscillator videos
    • Passive sensors videos
    • Resistor videos

    Ripple Steering in Coupled Inductors: SEPIC Case

    SEPIC Converter with Coupled and Uncoupled Inductors

    Coupled Inductors in SEPIC versus Flyback Converters

    Non-Linear MLCC Class II Capacitor Measurements Challenges

    Percolation Phenomenon and Reliability of Molded Power Inductors in DC/DC converters

    Root Causes and Effects of DC Bias and AC in Ceramic Capacitors

    How to Calculate the Output Capacitor for a Switching Power Supply

    Switched Capacitor Converter Explained

    Understanding Inductor Dot Markings and Their Application in LTspice

    Trending Tags

    • Capacitors explained
    • Inductors explained
    • Resistors explained
    • Filters explained
    • Application Video Guidelines
    • EMC
    • New Products
    • Ripple Current
    • Simulation
    • Tantalum vs Ceramic
  • Knowledge Blog
  • Suppliers
    • Who is Who
  • Events
  • Home
  • NewsFilter
    • All
    • Aerospace & Defence
    • Antenna
    • Applications
    • Automotive
    • Capacitors
    • Circuit Protection Devices
    • electro-mechanical news
    • Filters
    • Fuses
    • Inductors
    • Industrial
    • Integrated Passives
    • inter-connect news
    • Market & Supply Chain
    • Market Insights
    • Medical
    • Modelling and Simulation
    • New Materials & Supply
    • New Technologies
    • Non-linear Passives
    • Oscillators
    • Passive Sensors News
    • Resistors
    • RF & Microwave
    • Telecommunication
    • Weekly Digest

    TDK Releases Ultra-small PFC Capacitors

    KYOCERA AVX Releases Novel Mini BME Stacked Ceramic Capacitors

    Vishay Releases Class 1 Leaded High Voltage Ceramic Disc Capacitors

    TDK Releases 140C Compact Vibration Robust Automotive Aluminum Capacitors

    DigiKey Presents Factory Tomorrow Season 5 Video Series

    Samsung MLCCs Lineup for In-Vehicle Infotainment

    source: Samtec

    Best Practices for Cable Management in High-Speed and High-Density Systems

    Würth Elektronik Unveils Compact Common-Mode Data Lines Chokes

    Bourns Releases TCO 240 Watt USB Mini-Breaker

    Trending Tags

    • Ripple Current
    • RF
    • Leakage Current
    • Tantalum vs Ceramic
    • Snubber
    • Low ESR
    • Feedthrough
    • Derating
    • Dielectric Constant
    • New Products
    • Market Reports
  • VideoFilter
    • All
    • Antenna videos
    • Capacitor videos
    • Circuit Protection Video
    • Filter videos
    • Fuse videos
    • Inductor videos
    • Inter-Connect Video
    • Non-linear passives videos
    • Oscillator videos
    • Passive sensors videos
    • Resistor videos

    Ripple Steering in Coupled Inductors: SEPIC Case

    SEPIC Converter with Coupled and Uncoupled Inductors

    Coupled Inductors in SEPIC versus Flyback Converters

    Non-Linear MLCC Class II Capacitor Measurements Challenges

    Percolation Phenomenon and Reliability of Molded Power Inductors in DC/DC converters

    Root Causes and Effects of DC Bias and AC in Ceramic Capacitors

    How to Calculate the Output Capacitor for a Switching Power Supply

    Switched Capacitor Converter Explained

    Understanding Inductor Dot Markings and Their Application in LTspice

    Trending Tags

    • Capacitors explained
    • Inductors explained
    • Resistors explained
    • Filters explained
    • Application Video Guidelines
    • EMC
    • New Products
    • Ripple Current
    • Simulation
    • Tantalum vs Ceramic
  • Knowledge Blog
  • Suppliers
    • Who is Who
  • Events
No Result
View All Result
Passive Components Blog
No Result
View All Result

Innovative Quality Control to Improve the Reliability of Tantalum Capacitors

15.5.2024
Reading Time: 5 mins read
A A

Vladimir Azbel Ph.D., semiconductor process reliability engineer consultant, Israel proposes an innovative solution for tantalum capacitor production quality enhancement: introducing an internal standard for incoming inspection to assess the quality of the supplied powder.

The production of tantalum capacitors is a complex and labor-intensive process, consisting of a row of manufacturing, control, and auxiliary operations. The proposed innovative method, in addition to existing quality control methods, will ensure the stability reliability, and performance of tantalum capacitors.

RelatedPosts

Influence of Tantalum Capacitor Pellets Size on Stability During Oxide Film Formation

Enhanced Process Control in Tantalum Capacitor Anode Manufacturing Reduces Cost and Improves Reliability

Enhancing Effectiveness of Tantalum Capacitor Anode Control

The initial operations in the production of tantalum capacitors include sintering tantalum powder, obtaining a sintered volumetric-porous pellet, and its formation, with the created anode, where the main electrical characteristics of the future capacitor, such as capacitance, dissipation factor, and leakage current, are formed.

The quality of the obtained anode is controlled by two operations: inspection of the appearance of the sintered pellet and, after formation, checking the current electrical characteristics of the anodes. The electrical characteristics of the anode depend on many factors, beginning from the morphology of the porous structure of the sintered pellet, which must satisfy parameters formation, set by the manufacturer and allow minimizing the risk of internal stress formation. Thermal annealing operations are used to reduce the level of internal stresses in the anodes; however, currently, there is no control over the degree of stress reduction and the residual stress level in the anode material.

During storage and especially the exploitation of tantalum capacitors, due to the relaxation of residual internal stresses, lead to deterioration of their electrical parameters, primarily an increase in leakage current.

Created of internal stresses in sintered pellets is a well-known problem in powder metallurgy. Usually, for control of internal stresses, mechanical testing is most often used, including recording the Stress-Strain curve and determining its parameters such as the modulus of elasticity and yield strength. These data can be used as indicators for the estimate of residual stresses in the sintered pellet and the anode.

Since aging and degradation of electrical properties significantly affect the quality of tantalum capacitors, there is a need to control the influence of residual internal stresses in volumetric-porous tantalum anodes. It is proposed to introduce an additional control operation into the list of operations in anode
production, which consists of measuring the mechanical properties of the anodes.

Control of mechanical properties does not require additional equipment, as it can be performed on standard testing machines used in the measurement laboratories of enterprises, that issue tantalum capacitors. There is no need for special samples to measure mechanical properties, as a limited number of
sintered pellets, or anodes (from 3 to 10) can be used. The procedure for measuring and processing the deformation diagram to obtain values of mechanical properties is simple and can be carried out by a midlevel specialist or using existing software.

Determining the mechanical properties of anodes at various stages of their production can provide useful information for adjusting technological processes. This data can include information about the morphology of the porous structure of the sintered pellet and its impact on the quality of the initial tantalum
powders, etc.

In addition, mechanical properties data can be used: for monitoring the stability of technological processes, and the quality of anodes made from different batches, lots, powders, etc.

Measuring the mechanical properties of sintered pellets and comparing them with reference characteristics allows for evaluating the resistance of the anode material to mechanical and thermal loads.

Measuring the mechanical properties after formation and thermal annealing of the anode provides direct information about residual stresses in the anode material, which can be used as an express indicator of the capacitor’s quality.

Comparing the measurement results with the benchmark allows for determining which of the electrical parameters anode needs improvement and optimizing the technological modes on which it depends, ultimately improving the quality of the final product.

Benchmark characteristics of the mechanical properties of sintered pellets and anodes can be used in sintered pellets and anodes, from capacitors, that have passed long-term tests or got by striping from capacitors that have successfully passed operation. The proposed mechanical characteristics include the
modulus of elasticity, yield strength, and strain hardening coefficient, which reflect porosity, neck size, and defectiveness, and are responsible for capacitance, forming voltage, and anode leakage currents.

Introducing control over the mechanical properties of the sintered pellet and anode will improve the quality and operational durability of tantalum capacitors, an additional competitive advantage of the manufactured products.

In Summary

“Introducing an Innovative Internal Standard for Powder Quality Assessment in Tantalum Capacitor Production”

I propose an innovative solution: introducing an internal standard for incoming inspection to assess the quality of the supplied powder. This standard, specially developed for this purpose, is based on the mechanical properties of sintered pellets. Producing high-quality powder is a multifaceted technological challenge. Factors such as raw material purity, processing methods, chemical composition, particle size, and distribution play a crucial role. Each of these parameters has a specific range adapted to specific requirements.

Tantalum powders used in capacitors and supplied by various manufacturers undergo purity checks according to ASTM requirements and consumer certification standards, under which incoming inspection is conducted. However, differences in their production processes can lead to internal variations that may affect the reliability of capacitors made from these powders. Deviations within the limits set by certificates and the production process can influence both mechanical and electrical characteristics. Maximum allowable changes have been established for the latter. The certification process should guarantee optimal electrical characteristics of the anode.

Despite the experimental data provided by certificates and experimental data on the electrical characteristics of various batches of powder falling within acceptable limits, this did not guarantee acceptable leakage currents in all tested batches. This is because the electrical characteristics of the anode are not directly related to the morphology of the porous structure of the sintered pellet (the parameters of formation are defined by the customer). To maintain the values of electrical characteristics in different batches, it is necessary to ensure the identity of the morphology of the porous structure of the sintered pellet in the tested batches. This can be controlled through the mechanical properties of the sintered pellet.

Implementing an internal standard for incoming inspection based on mechanical properties will help reduce the time and financial costs of using a powder that does not meet the requirements for producing tantalum capacitors. While the analysis of chemical composition and other powder parameters can be addressed in existing certification, the mechanical properties of sintered pellets can serve as an additional quality indicator, aiding in ensuring the stability of capacitor electrical characteristics.

Related

Source: Vladimir Azbel

Recent Posts

TDK Releases Ultra-small PFC Capacitors

10.9.2025
15

KYOCERA AVX Releases Novel Mini BME Stacked Ceramic Capacitors

10.9.2025
18

Vishay Releases Class 1 Leaded High Voltage Ceramic Disc Capacitors

10.9.2025
9

TDK Releases 140C Compact Vibration Robust Automotive Aluminum Capacitors

5.9.2025
24

Samsung MLCCs Lineup for In-Vehicle Infotainment

4.9.2025
27

Vishay Releases Harsh Environment Robust DC-Link Film Capacitor

2.9.2025
36

Influence of Tantalum Capacitor Pellets Size on Stability During Oxide Film Formation

29.8.2025
40

Modelithics Release Discrete Components Optimization Article for RF/Microwave Designers

28.8.2025
15

Samsung Extends Capacitance of MLCC 0805 X7T 250V to 100nF

28.8.2025
34

Samsung Releases Ultra–High-Capacitance 4.7uF 2.5V MLCC in 0201 for AI GPU

27.8.2025
44

Upcoming Events

Sep 16
17:00 - 18:00 CEST

EMI Shielding Challenges

Sep 22
September 22 @ 13:00 - September 25 @ 15:15 EDT

Pre Cap Visual Inspection per Mil-Std-883 (TM 2017)

Sep 30
September 30 @ 12:00 - October 2 @ 14:00 EDT

MIL-Std-883 TM 2010

Oct 17
12:00 - 14:00 EDT

External Visual Inspection per MIL-STD-883 TM 2009

Oct 20
October 20 - October 23

Digital WE Days 2025 – Virtual Conference

View Calendar

Popular Posts

  • Buck Converter Design and Calculation

    0 shares
    Share 0 Tweet 0
  • Boost Converter Design and Calculation

    0 shares
    Share 0 Tweet 0
  • Flyback Converter Design and Calculation

    0 shares
    Share 0 Tweet 0
  • LLC Resonant Converter Design and Calculation

    0 shares
    Share 0 Tweet 0
  • Dual Active Bridge (DAB) Topology Explained

    0 shares
    Share 0 Tweet 0
  • Ripple Current and its Effects on the Performance of Capacitors

    3 shares
    Share 3 Tweet 0
  • What is a Dielectric Constant and DF of Plastic Materials?

    4 shares
    Share 4 Tweet 0
  • SEPIC Converter Design and Calculation

    0 shares
    Share 0 Tweet 0
  • How to Design an Inductor

    0 shares
    Share 0 Tweet 0
  • Core Materials, Permeability and Their Losses

    0 shares
    Share 0 Tweet 0

Newsletter Subscription

 

Passive Components Blog

© EPCI - Leading Passive Components Educational and Information Site

  • Home
  • Privacy Policy
  • EPCI Membership & Advertisement
  • About

No Result
View All Result
  • Home
  • Knowledge Blog
  • Premium Suppliers

© EPCI - Leading Passive Components Educational and Information Site

This website uses cookies. By continuing to use this website you are giving consent to cookies being used. Visit our Privacy and Cookie Policy.
Go to mobile version