COMPOSITE MATERIAL BASED ON CUBIC BORON
NITRIDE MICROPOWDER WITH A COATING
S. P. Bogdanov,
A. P. Garshin,
and V. A. Ponomarenko
Translated from Novye Ogneupory, No. 11, pp. 45 – 51, November 2015.
Original article submitted June 18, 2015.
Results are provided for a study preparation of cubic boron nitride by a sintering method with prior application
to it in high-pressure equipment of a coating based on titanium.
Keywords: composite materials, cubic boron nitride, cladding, iodide transport method, high-pressure equip
ment, ultrahard materials for cutting tools.
The contemporary world is characterized by a steady in-
crease in development and introduction of composite mate-
rial technology. Composite materials are already used in in-
dustry, construction, defence, and in many other spheres of
constantly development progress activity. There is headlong
growth of interest in some structural composite material
properties both within Russia [1, 2] and overseas .
A considerable amount of cubic boron nitride powder
(CBN, cBN) is used within the composition of various com
posite ceramic and cermet materials [4, 5], used in abrasive
and cutting tools. The surface of a CBN powder grain plays
an important role in composite structure. Therefore in order
to obtain a uniform structure and typical composite proper
ties there is often use of powder with application of func
tional coatings to its surface, which improve adhesive prop
erties, increase thermal conductivity of the BN–binder phase
boundary, and improve chemical resistance and electrical
conductivity. In [6 – 9] the possibility was demonstrated of
preparing metal coatings on powder by iodide transport and
their use for sintering composite materials.
RESEARCH AIM AND OBJECTS
The aim of this work is to determine conditions for
sintering cubic boron nitride with a titanium coating of dif-
ferent composition and thickness, a study of some properties
of the specimens (sintered) obtained (structure, density,
microhardness, wear resistance), and comparison of the ma-
terials obtained with well-known analogs. The objects used
for study were cubic boron nitride powders of different grain
size. Since industrial preparation of a composite is based on
use of powder with a particle size of more than 3 mm, broad
(2–10mm) and narrow (4 – 8 mm) fractions were selected
for studies from a traditional collection of grain sizes. The
possibility was also studied of sintering micropowder with a
grain size of less than 3 mm, which is not normally used due
to the unsatisfactory properties of composites sintered from
it. Micropowder grain size distribution with a size less than
3 mm was studied in a SediGraph 5500L sediment meter after
breaking aggregates with ultrasound. The integral and differ
ential grain size distribution curves for micropowder are
shown in Fig. 1. The calculated specific surface is 1.4 m
The overall impurity content of graphite-like boron nitride
and graphite in a specimen is less than 0.1 wt.%.
Titanium metal was used for cladding in the form of
powder grade PTOM-1 with a particle size of 4 to 40 mm.
An iodide transport method was used for cladding cubic
boron nitride powder with titanium [6, 7]. The experimental
Refractories and Industrial Ceramics Vol. 56, No. 6, March, 2016
1083-4877/16/05606-0615 © 2016 Springer Science+Business Media New York
FGBOU VPO St. Petersburg State Technological University
(Technical University), St. Petersburg, Russia.
FGOAU VO Peter the Great St. Petersburg Polytechnic Univer
sity, St Petersburg, Russia.
OOO VIRIAL, St. Petersburg, Russia.