This study describes the effect of preliminary mechanical activation and SiO2 quartz content on combustion rate, maximum combustion temperature, sample elongation during combustion, compressibility of mixtures, composite particle size, phase composition, and the structural features of combustion products in a Ni–Al–SiO2 system. In Ni–Al–SiO2 initial mixtures, not subjected to mechanical activation, it is not possible to initiate combustion at room temperature if the mass content of SiO2quartz exceeds 10%. Preliminary mechanical activation of the Ni–Al– $$x$$ SiO2reaction mixture expands the limit of quartz content in the mixture, at which it is possible to realize the combustion of pressed samples at room temperature, up to 40%. The burning rate and sample elongation during combustion increase significantly after the reaction mixtures are mechanically treated, and the relative density of the samples, obtained at a fixed pressing pressure, decreases. The increasing quartz content in the Ni–Al– $$x$$ SiO2reduces the combustion rate, the maximum combustion temperature, and the sample elongation during the combustion of both the initial and mechanically activated mixtures. Moreover, as the quartz content increases, so does the sample density reached at a fixed pressing pressure in the case of initial mixtures, while the density in the case of mechanically activated mixtures is virtually not affected. The increasing quartz content also reduces the composite particle size after mechanical activation and increases the number of phases formed in the reaction products. An explanation for most of the observed relationships is proposed.

中文翻译：

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SiO2 含量和机械活化对 Ni-Al-SiO2 燃烧的影响

本研究描述了初步机械活化和 SiO2 石英含量对燃烧速率、最大燃烧温度、燃烧过程中的样品伸长率、混合物的可压缩性、复合颗粒尺寸、相组成以及 Ni-Al-中燃烧产物结构特征的影响。 SiO2 系统。在 Ni-Al-SiO2 初始混合物中，未进行机械活化，如果 SiO2 石英的质量含量超过 10%，则不可能在室温下引发燃烧。Ni-Al-$x$$ SiO2反应混合物的初步机械活化扩大了混合物中石英含量的极限，在这个极限下，可以实现压制样品在室温下的燃烧，高达40%。对反应混合物进行机械处理后，燃烧过程中的燃烧速率和样品伸长率显着增加，并且在固定压制压力下获得的样品的相对密度降低。Ni-Al-$x$$ SiO2 中石英含量的增加降低了初始和机械活化混合物燃烧期间的燃烧速率、最高燃烧温度和样品伸长率。此外，随着石英含量的增加，在初始混合物的情况下，在固定压制压力下达到的样品密度也会增加，而机械活化混合物的密度几乎不受影响。增加的石英含量还降低了机械活化后的复合颗粒尺寸，并增加了反应产物中形成的相数。