Cobalt-containing ultramarine spinel-type pigments are fabricated in the ZnO–MgO–CoO–Al(OH)₃–Al system by self-propagating high-temperature synthesis (SHS). the initial components are oxides of cobalt (Co₃O₄) and zinc (ZnO), aluminum hydroxide (Al(OH)₃), and magnesium nitrate hexahydrate (Mg(NO₃)₂ · 6H₂O). An aluminum powder of the ASD-4 brand is used as the reducer metal. The synthesis is performed using samples 40 mm in diameter. The combustion wave propagation velocity is 1–2 mm/s, and the maximal synthesis temperature is 1180°C. Parallel processes of oxidation of aluminum and aluminothermic reactions are leading reactions that provide the synthesis of spinel-based ceramic pigments in the layer-by-layer combustion. These processes result in charge self-heating to the synthesis temperature of spinels, which are also formed with heat liberation. The rapid destruction of Al(OH)₃ upon heating leads to the formation of active submicron γ-Al₂O₃ participating in the subsequent synthesis of finely dispersed spinel structure. Endotherms associated with the decomposition of Al(OH)₃ lead to cooling of combusting sample, which complicates the SHS implementation are requires an additional heat supply. Gases liberated during thermal decomposition loosen the charge in the heating zone and decrease the maximal combustion temperature, which makes it possible to perform the synthesis in the solid phase without product fusion and acquire it in the finely dispersed state. Microstructural investigations into the samples by means of scanning electron microscopy confirmed the finely dispersed structure of pigments. IR spectroscopic and X-ray phase analyses revealed a spinel structure. Particle-size-distribution histograms for the initial Al(OH)₃ and after its heating, as well as for synthesized spinels, are presented in the work. It is shown that the content of particles 903 nm in diameter is maximal in pigment. Thus, the fabrication of spinel-type pigments in the finely dispersed state by solid-phase synthesis immediately in the combustion wave considerably simplifies the process flowsheet of their production due to the absence of a grinding state.

通过自蔓延高温合成（SHS）在ZnO–MgO–CoO–Al（OH）₃ –Al系统中制备含钴的深蓝色尖晶石型颜料。初始成分为钴（Co ₃ O ₄）和锌（ZnO）的氧化物，氢氧化铝（Al（OH）₃）和六水合硝酸镁（Mg（NO ₃）₂ ·6H ₂O）。使用ASD-4品牌的铝粉作为还原剂金属。使用直径为40 mm的样品进行合成。燃烧波的传播速度为1-2 mm / s，最高合成温度为1180°C。铝的氧化和铝热反应的平行过程是领先的反应，这些反应在逐层燃烧中提供了尖晶石基陶瓷颜料的合成。这些过程导致电荷自加热到尖晶石的合成温度，尖晶石的合成也通过热量释放而形成。的Al（OH）的迅速破坏₃在加热导致活性亚微米的形成的γ-Al ₂ ö ₃参与精细尖晶石结构的后续合成。与Al（OH）₃分解相关的吸热导致燃烧样品的冷却，这使SHS的实施变得复杂，需要额外的热量供应。在热分解过程中释放出的气体使加热区内的电荷松散并降低了最高燃烧温度，这使得可以在固相中进行合成而没有产物融合，并以细分散状态获得。通过扫描电子显微镜对样品的显微结构研究证实了颜料的精细分散结构。红外光谱和X射线相分析显示出尖晶石结构。初始Al（OH）₃的粒度分布直方图加热后，以及合成尖晶石都在工作中介绍。结果表明，颜料中直径最大903 nm的颗粒含量最大。因此，通过在燃烧波中立即通过固相合成来制造细分散状态的尖晶石型颜料，由于没有研磨状态，因此极大地简化了其生产的工艺流程。