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Key Documents

667447

Sigma-Aldrich

Ceramic Etchant A

Synonym(s):

Al2O3 Etch, Aluminum Oxide Etchant, GaN Etch, Gallium Nitride Etchant, Si3N4 Etch, Silicon Nitride Etchant

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About This Item

MDL number:
MFCD08705343
UNSPSC Code:
12352300
NACRES:
NA.23
Pricing and availability is not currently available.

Quality Level

100

Related Categories

Application

Useful for fast and controllable etching of silicon nitride (Si3N4), galium nitride (GaN), or aluminum oxide (Al2O3).

Features and Benefits

Etch Rates @ 180 °C:
Aluminum oxide 120 Å/min
Silicon nitride 125 Å/min
Gallium nitride 80 Å/min
Silicon dioxide 1 Å/min
Silicon 1 Å/min

Pictograms

CorrosionExclamation mark
GHS05,GHS07

Signal Word

Danger

Hazard Statements

H290,H302,H314

Hazard Classifications

Acute Tox. 4 Oral - Eye Dam. 1 - Met. Corr. 1 - Skin Corr. 1B

Storage Class Code

8B - Non-combustible corrosive hazardous materials

WGK

WGK 1

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

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Certificates of Analysis (COA)

Lot/Batch Number
MKCV9361
MKCW4222
MKCT3785
MKCP2744
MKCP1720

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Questions

1–2 of 2 Questions  

  1. What is the etch selectivity of the etchant with respect to YSZ? Will it attack YSZ.

    1 answer

    1. Unfortunately, the etch selectivity to YSZ has not been determined. The bulk of this product is phosphoric acid, which has been studied as an etchant for Yttria-stabilized Zirconia. Please see the links below to publications that may be helpful.
      ACID ETCHING SURFACE TREATMENT OF FELDSPATHIC, ALUMINA AND ZIRCONIA CERAMICS: A MICROMORPHOLOGICAL SEM ANALYSIS.
      http://moderndentistrymedia.com/may_june2006/zarone2.pdf

      Effect of 37% Phosphoric Acid Etchant on Surface Topography of Zirconia Crowns – An In Vitro Study
      https://aimdrjournal.com/wp-content/uploads/2021/06/DE2_OA_Adi-edit.pdf

      Room-temperature etching of stabilized zirconia
      https://link.springer.com/content/pdf/10.1007/BF00838349.pdf

      Helpful?

  2. What is the etch selectivity of the etchant with respect to aluminum metal? Is product 667447 suitable for use as an alumina etchant?

    1 answer

    1. The Ceramic Etchant A has a much higher etching rate for aluminum compared to alumina. Additionally, without an oxidizer, it may leave smut and residue behind. Given the solubility properties of both materials, it is not feasible to selectively etch alumina without significantly faster etching of aluminum.

      Helpful?

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