EFFECT OF AIR-ABRASIVE TREATMENT
ON OXIDE-CARBIDE CERAMIC OBJECT OPERATING PROPERTIES
V. V. Kuzin,
N. R. Portnoi,
S. Yu. Fedorov,
and V. I. Moroz
Translated from Novye Ogneupory, No. 9, pp. 62 – 67, September 2015.
Original article submitted July 23, 2015.
A connection is established by experiment of air-abrasive production parameters with the surface morphology
of VOK71 cutting tips made of oxide-carbide ceramic. Features are revealed for ceramic surface formation in
this process and mechanisms participating within it. High efficiency is demonstrated for air-abrasive treatment
in order to improve ceramic object operating properties.
Keywords: air-abrasive treatment (AAT), oxide-carbide ceramic, morphology, roughness, cutting tip, wear.
A promising production process for manufacturing ob-
jects made of ceramic materials is jet-abrasive treatment, in-
cluding action of a high-speed abrasive jet on a workpiece
surface . As a result of this action on a workpiece there is
formation of a surface layer giving various ceramic materials
improved properties . A favorable effect includes a reduc-
tion in the number of defects, forming after diamond grind-
ing and intensifying object wear during operation [3, 4].
A liquid or air are used as the carrier for abrasive parti
cles during jet-abrasive treatment. In the first case the “tool”
providing removal of a tolerance from a workpiece is a hy
dro-abrasive jet, and in the second it is an air-abrasive jet.
Features of forming a ceramic surface layer during hy
dro-abrasive treatment have been considered in [5, 6]. Re
sults of work carried out concerning air-abrasive treatment
(AAT) are not systematic, which makes it impossible to eval
uate the efficiency of this method for controlling ceramic ob
ject surface layer condition. In addition, development of new
methods for improving the operating stability of ceramic ob
jects is an important scientific and technical task .
The aim of this work is to study the effect of AAT on op
erating properties of oxide-carbide ceramic objects (on the
example of cutting tip VOK71).
The object studied was a four-sided cutting tip VOK71
with a size of 12.7 ´ 12.7 ´ 4.76 mm made of oxide-carbide
ceramic; AAT of tips was carried in a two-chamber unit of
the planetary type. A tip 1 was fixed in the space between
four pins 2 at the outer surface of a satellite 3 located on a
movable working table 4 of the unit (Fig. 1a ). Synchronized
movement of the actuating mechanisms of the unit provide
rotation of satellites with tips only at the instant of arrival
within the action zone of an air-abrasive jet, formed by each
nozzle. Due to rotation of a working table at a rate of v
moved with respect to the nozzles and rotation of the satellite
with velocity v
at the instant of arrival of a tip in the operat
ing area for each nozzle provided uniform treatment of all
working surfaces (leading, four rear, and perimeter of the
strengthening bevel) of tips (Fig. 1b ).
The operating cycle of the AAT consisted of single stage
passage of a tip with respect to eleven nozzles, and within the
action zone of each nozzle a tip completes one rotation. The
dwell time of a tip in the action zone of each nozzle was 1, 2,
and 3 sec, with an overall treatment time t of 11, 22, and
33 sec respectively. Pressure P of the abrasive jet was mea
sured in the range from 1.2 to 2.5 atm. Angle a of the incli
nation of nozzles (attack angle of an air-abrasive jet) in all
experiments remained unchanged, a = 45°. The following
were also constant: abrasive was white electrocorundum
fraction 150 mm, nozzle orifice d
= 7 mm, and distance from
the nozzle to a workpiece L = 120 mm.
Refractories and Industrial Ceramics Vol. 56, No. 5, January, 2016
1083-4877/16/05605-0517 © 2016 Springer Science+Business Media New York
FGBOU VPO Moscow State Technological University Stankin,
OAO Sandvik – MKTS, Moscow, Russia.