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Particle adhesion is a typical characteristic of particulate materials. The addition of poorly packed nanoparticles to microparticles may control their adhesiveness at high temperatures. Herein, we focused on calcium carbonate nanoparticles (CaCO 3 NPs) to control particle adhesion at high temperatures. The CaCO 3 NPs were added to stable and less-adhesive silica and kaolin microparticles. At 900 °C, the tensile strength of the kaolin powder bed increased 6.8 times with the addition of CaCO 3 NPs, but that of SiO 2 did not increase. We found that the addition of CaCO 3 NPs to kaolin promoted sintering of particles at high temperatures, which was responsible for the increase in tensile strength. Size and amount of CaCO 3 NPs are important factors to determine the particle adhesion. The addition of alumina nanoparticles (Al 2 O 3 NPs) to the kaolin-CaCO 3 NPs system successfully suppressed the increase in tensile strength at high temperatures caused by CaCO 3 NPs. [Display omitted] • Controlling the particle adhesion at high temperatures is important. • Addition of poorly packed nanoparticles may control tensile strength of powder bed. • Calcium carbonate nanoparticles increased the tensile strength of the kaolin. • Tensile strength of silica did not increase with addition of the calcium carbonate. • Addition of calcium carbonate nanoparticles promoted sintering of particles. [ABSTRACT FROM AUTHOR]