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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">powder</journal-id><journal-title-group><journal-title xml:lang="ru">Известия вузов. Порошковая металлургия и функциональные покрытия</journal-title><trans-title-group xml:lang="en"><trans-title>Powder Metallurgy аnd Functional Coatings (Izvestiya Vuzov. Poroshkovaya Metallurgiya i Funktsional'nye Pokrytiya)</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1997-308X</issn><issn pub-type="epub">2412-8767</issn><publisher><publisher-name>НИТУ "МИСИС"</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.17073/1997-308X-2019-4-44-54</article-id><article-id custom-type="elpub" pub-id-type="custom">powder-502</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>Наноструктурированные материалы и функциональные покрытия</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>Nanostructured Materials and Functional Coatings</subject></subj-group></article-categories><title-group><article-title>Кинетика формирования  диэлектрического  покрытия на порошки железа для получения композиционных магнитно-мягких материалов</article-title><trans-title-group xml:lang="en"><trans-title>Kinetics of dielectric coating formation on iron powders to obtain soft magnetic composite materials</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Гасанов</surname><given-names>Б. Г.</given-names></name><name name-style="western" xml:lang="en"><surname>Gasanov</surname><given-names>B. G.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Доктор технических наук, профессор кафедры автомобилей и транспортно-технологических комплексов ЮРГПУ (НПИ) им. М.И. Платова.</p><p>346428, Ростовская обл., Новочеркасск, ул. Просвещения, 132.</p></bio><bio xml:lang="en"><p>Dr. Sci. (Tech.), prof. of the Department «Automobiles and  transport-technological complexes», Platov South Russian State Polytechnic University (Novocherkassk Polytechnic Institute) (NPI).</p><p>346428, Rostov region, Novocherkassk, Prosveshcheniya str., 132.</p></bio><email xlink:type="simple">gasanov.bg@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Тамадаев</surname><given-names>В. Г.</given-names></name><name name-style="western" xml:lang="en"><surname>Tamadaev</surname><given-names>V. G.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Кандидат технических наук, доцент, заведующий кафедрой технологии машиностроения, технологических машин и оборудования ЮРГПУ (НПИ) им. М.И. Платова. </p><p>346428, Ростовская обл., Новочеркасск, ул. Просвещения, 132.</p></bio><bio xml:lang="en"><p>Cand. Sci. (Tech.), associate prof., head of the Department «Engineering technology, technological machines and  equipment», Platov South Russian State Polytechnic University (NPI).</p><p>346428, Rostov region, Novocherkassk, Prosveshcheniya str., 132.</p></bio><email xlink:type="simple">TamadaevVG@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Богачев</surname><given-names>В. О.</given-names></name><name name-style="western" xml:lang="en"><surname>Bogachev</surname><given-names>V. O.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Инженер.</p><p>346410, Ростовская обл., Новочеркасск, ул. Комитетская, 48.</p></bio><bio xml:lang="en"><p>Engineer of LLC «Kriotech».</p><p>346410, Rostov region, Novocherkassk, Komitetskaya str., 48.</p></bio><email xlink:type="simple">valentin161@yandex.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Махмудова</surname><given-names>Е. Р.</given-names></name><name name-style="western" xml:lang="en"><surname>Makhmudova</surname><given-names>E. R.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Аспирант кафедры международных логистических систем и комплексов ЮРГПУ (НПИ) им. М.И. Платова.</p><p>346428, Ростовская обл., Новочеркасск, ул. Просвещения, 132.</p></bio><bio xml:lang="en"><p>Graduate student of the Department «International logistics systems and  complexes», Platov South Russian State Polytechnic University (NPI).</p><p>346428, Rostov region, Novocherkassk, Prosveshcheniya str., 132.</p></bio><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru">Южно-Российский государственный политехнический университет (ЮРГПУ–НПИ) им. М.И. Платова<country>Россия</country></aff><aff xml:lang="en">Platov South Russian State Polytechnic University (Novocherkassk Polytechnic Institute) (NPI)<country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru">ООО «Криотех»<country>Россия</country></aff><aff xml:lang="en">LLC «Kriotech»<country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2019</year></pub-date><pub-date pub-type="epub"><day>15</day><month>12</month><year>2019</year></pub-date><volume>0</volume><issue>4</issue><fpage>44</fpage><lpage>54</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; НИТУ "МИСИС", 2019</copyright-statement><copyright-year>2019</copyright-year><copyright-holder xml:lang="ru">НИТУ "МИСИС"</copyright-holder><copyright-holder xml:lang="en">НИТУ "МИСИС"</copyright-holder><license xlink:href="https://powder.misis.ru/jour/about/submissions#copyrightNotice" xlink:type="simple"><license-p>https://powder.misis.ru/jour/about/submissions#copyrightNotice</license-p></license></permissions><self-uri xlink:href="https://powder.misis.ru/jour/article/view/502">https://powder.misis.ru/jour/article/view/502</self-uri><abstract><p>Обоснованы актуальность и  эффективность  применения силикатсодержащего  неорганического покрытия в  качестве электроизолирующего при  производстве магнитно-мягких композиционных материалов (ММКМ) из  порошков железа. Показано влияние концентрации силиката натрия (Na2O–SiO2) в водном растворе на  кинетику  формирования диэлектрического покрытия на железных порошках разных марок, а так же на прирост их массы, среднюю толщину покрытия, физические и технологические характеристики. Экспериментально установлено, что  влияние морфологии частиц порошков железа и коэффициента поверхностного натяжения на границе жидкой и твердой фаз на толщину покрытия можно оценить косвенно по показателям смачиваемости, в частности по краевому углу. Рассмотрены особенности структурообразования  межслойных границ ММКМ. Элементное картирование с использованием энергодисперсионного микроанализатора показывает, что после прессования образцов при давлении 600  МПа и последующего нагрева в интервале 400–600°С изменяется толщина покрытия и протекает частичное перераспределения кремния в диэлектрическом слое. Это  обусловлено тем, что кремний, отличающийся более высоким сродством к кислороду, чем железо, активно реагирует  с адсорбированным на поверхности частиц железа кислородом и (или)  восстанавливает оксиды железа, образуя диоксид SiO2  в виде плотной пленки, которая, с одной стороны, защищает частицы железа от окисления, а с другой – в зоне контакта частиц железа образует диэлектрический слой, влияющий на удельные магнитные потери. Установлено, что отличительной особенностью уплотнения порошков железа с покрытием является преобладание структурной деформации при прессовании, поскольку покрытие снижает внутренний коэффициент трения. Показано, что по своим магнитным  характеристикам разработанный ММКМ отвечает современным требованиям, предъявляемым к магнитно-мягким композиционным материалам.</p></abstract><trans-abstract xml:lang="en"><p>The paper justifies the significance and  effectiveness of silicate-containing inorganic coating usage as an electric insulator in the production of soft magnetic composite materials (SMCM) from iron powders. The study demonstrates the effect of sodium silicate (Na2O–SiO2) concentration in the water solution on the kinetics of dielectric coating formation on different iron powder grades, as well as on  their weight gain, average coating thickness, as well as physical and  process characteristics. It is experimentally established that  the influence of iron powder particle morphology and  surface tension coefficient at solid-liquid interface on the coating thickness can be assessed indirectly by the wettability indicators, in particular, by the contact angle. The features of SMCM interlayer boundary structure formation are described. Elemental mapping using the energy dispersive X-ray spectrometer shows that after sample pressing at 600 MPa and their subsequent heating within 400–600°C, the coating thickness changes and silicon is partially redistributed in the dielectric layer. This is determined by the fact that silicon featuring higher oxophilicity than  iron actively reacts with oxygen adsorbed on the iron particle surface and/or reduces iron oxides forming SiO2 in the form of a dense film, which on the one hand protects iron particles from  oxidation, and  on the other hand forms a dielectric layer in the zone of iron particle contact that  affects specific magnetic losses. It is determined that  the distinctive feature of coated iron powder compaction is the structural deformation predominance during pressing since the coating reduces the internal friction coefficient. It is shown that according to its magnetic characteristics, the developed SMCM meets essential contemporary requirements for soft magnetic composite materials.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>магнитно-мягкий композиционный материал</kwd><kwd>диэлек трик</kwd><kwd>струк т урообразование</kwd><kwd>покрытие</kwd><kwd>силикат натрия</kwd><kwd>морфология поверхности частиц</kwd><kwd>межчастичные контакты</kwd></kwd-group><kwd-group xml:lang="en"><kwd>soft magnetic composite material</kwd><kwd>dielectric</kwd><kwd>structure formation</kwd><kwd>coating</kwd><kwd>sodium silicate</kwd><kwd>particle surface morphology</kwd><kwd>interparticle contacts</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Троицкий В.А., Ролик А.И., Яковлев А.И. Магнитодиэлектрики в силовой электротехнике. 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